How Do the Holidays Affect Your Heart?

How Do the Holidays Affect Your Heart?

What May Lead to Increased Cardiac Risk

While the holidays are meant to be filled with the joy of family and friends and good times, for anyone with heart disease—or who is at an increased risk for heart disease—the holidays instead may be a time of special risk.

Several studies have shown that during the winter holidays not only are heart problems more likely to occur but when they do occur they are more likely to be fatal. The months of December and January are especially risky for people with heart disease.

And according to a 2004 study published in Circulation, the three dates people are most likely to die from heart disease are Dec. 25, Dec. 26, and Jan. 1.

Why Are the Holidays Dangerous to Your Heart?

Why the holiday period is a particularly dangerous time for the heart is being debated among experts. But in trying to pinpoint a culprit, the experts have plenty of potential causes to choose from. In fact, the increased cardiac risk associated with the holidays is very likely produced by many different factors working together.

The Holidays and the Risk of Heart Attack

Myocardial infarctions (heart attacks) account for most of the excess heart problems that occur during the holidays.  

Heart attacks are usually caused by a condition called acute coronary syndrome, or ACS. ACS happens when an atherosclerotic plaque in a coronary artery suddenly ruptures, and a blood clot begins to form at the site of the ruptured plaque.

  If the clot completely occludes the artery, a complete heart attack (known as an STEMI) occurs.  If the occlusion is less than complete, then generally the victim suffers either a “partial” heart attack (an NSTEMI), or unstable angina. All episodes of ACS are considered to be medical emergencies, and if treatment is delayed, increased heart damage or death can occur.

Most likely, the reason ACS is more common during the holidays is that the holiday season tends to abound with “triggers” for ACS - that is, with events that can hasten the rupture of a plaque.  Here are some triggers for ACS that tend to be more common during the holidays than at other times.  While this list stresses the risk factors we see especially during the winter holidays, keep in mind that several of these risks may turn up with any holiday, or with any important event in your life:  

exposure to cold weather

exposure to sudden and unusual levels of exertion, such as shoveling snow

exposure to emotional stress, which is very common and is often fairly severe during the holidays

becoming sedentary over the winter months

exposure to illness, especially influenza, which can produce inflammatory changes in the blood vessels

over-indulging in food, alcohol and/or tobacco

exposure to indoor pollution, such as cigarette smoke, or even a poorly-drafted log-burning fireplace

All these factors likely contribute to the excess in heart attacks that occur over the holidays.

The Holidays and Heart Failure

People with heart failure—a condition in which the heart is no longer able to function adequately to meet all of the body’s needs—are also at increased risk during the holiday period. The reasons that heart failure often worsens over the holidays are similar to the reasons that heart attacks are more common. These include exposure to the cold, sudden exertion (especially after slacking off on routine physical activity), exposure to “winter infections” like the flu, and over-indulgence.

Over-indulgence is a special problem if you have heart failure. Going off a low-salt diet is a common reason people need to be hospitalized for heart failure, especially during the holidays, as is having a few more drinks than normal. 

The Holidays and Cardiac Death

Not only are heart problems more frequent during the holidays, but when heart problems occur they are more likely to prove fatal. Nobody is sure of the reason for this, but the most likely cause is human nature.

Having a heart problem is never convenient, but at what time of year would it be less convenient than during the holidays? Not only would having a heart problem disrupt your own enjoyment of the festivities, but it would disrupt the lives of all your loved ones and friends who have worked so hard and traveled so far to make the holidays perfect. It is quite easy, during these times, to ignore the warning symptoms that might allow for early evaluation and rapid treatment. All too often, people suffering a heart attack during the holidays convince themselves they’re just imagining their symptoms, or attribute them to a stomach problem, or otherwise, excuse themselves from having to seek immediate medical help. (Ignoring cardiac symptoms, by the way, especially at holiday time, appears to be more common among women than men.) 

By the time the symptoms can no longer be brushed off, or by the time your loved ones can tell just by looking at you that you’re in trouble, it may be too late to prevent a catastrophe.

Just because it’s the holidays doesn’t mean it can’t be your heart. In fact, as we have just seen, just because it’s the holidays it’s more likely to be your heart.  Always take potential cardiac symptoms seriously—especially at holiday time.

Summary

Heart problems—and death from heart problems—are more likely to occur during the winter holidays than at any other time. You can reduce your odds of becoming a victim of holiday-related cardiac problems by avoiding the triggers that produce them, by being aware of the symptoms of heart disease, and by acting on those symptoms when you think they might be occurring.

Sources:

Kloner RA, Poole WK, Perritt RL. When throughout the year is coronary death most likely to occur? A 12-year population-based analysis of more than 220 000 cases. Circulation. 1999; 100: 1630–34.

Phillips DP, Jarvinen JR, Abramson IS, Et al. Cardiac mortality is higher around Christmas and New Years than at any other time: the holidays as a risk factor for death. Circulation. 2004; 110: 3781-88.

Spencer FA, Goldberg RJ, Becker RC, Gore JM. Seasonal distribution of acute myocardial infarction in the second National Registry of Myocardial Infarction. J Am Coll Cardiol. 1998 May;31(6):1226-33.

Environmental Protection Agency. Health Effects of Breathing Wood Smoke. 2007.http://www.epa.gov/burnwise/pdfs/woodsmoke_health_effects_jan07.pdf  

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5 Lesser-Known Risk Factors for Heart Attack

5 Lesser-Known Risk Factors for Heart Attack

By Steven Nissen, MD, Cleveland Clinic Expert - Reviewed by a board-certified physician.
Updated February 02, 2017

Many risk factors for heart attack are well known, among them smoking, diabetes, high blood pressure, obesity, and lack of exercise. These tend to be universal,

meaning they can increase the risk for nearly anyone. But there are other risk factors that put certain people at risk—or put people at risk under certain conditions. Let’s talk about these lesser-known risk factors and who is likely to be affected.

1  Extreme Cold

Cold temperatures cause the arteries to constrict which can cause a sudden increase in blood pressure. Combine this with physical exertion, such as shoveling snow, and the strain may be too much for some hearts to take. Every year, shoveling snow sends more than 11,000 people to the hospital—at least seven percent are with heart trouble.

2  Sudden Exertion

About of sudden, a strenuous physical activity can lead to heart attack in people who are not physically fit. It can happen from something as seemingly harmless as a pick-up game of basketball or from lifting and carrying something heavy, such as a shovel full of snow. People who are not used to exercising, or have traditional risk factors for heart disease, are at increased risk.

3  Heavy Meals

A heavy meal can occasionally trigger a heart attack. Researchers think it happens because eating raises levels of the hormone epinephrine which can increase blood pressure and heart rate.

4  Intense Emotions

Studies have shown that intense anger and grief can cause a heart attack. It probably occurs from a sudden increase in heart rate and blood pressure triggered by an element of surprise. Because many of us experience these emotions in our lifetime and live through them, they are probably more likely to negatively impact people who are already at increased risk for heart attack.

There is a condition called Takotsubo cardiomyopathy, which may imitate a heart attack, but is somewhat different. It tends to occur more often in women, at times of intense grief and produces heart attack-like symptoms that cause sudden heart failure. It is thought to be the result of an arterial spasm. With treatment, the heart failure often resolves after the grief subsides. Later testing generally shows no evidence of heart attack.

5  Related Conditions

When you are diagnosed with a serious medical condition that seems unrelated to your heart, the risk of heart attack may not cross your mind. For this reason, the role of certain conditions in raising the risk of heart attack is often unappreciated. Conditions known to increase the risk of heart attack include:

Rheumatoid arthritis, lupus, and any other inflammatory disease which can cause inflammation in the blood vessels

Preeclampsia (raises blood pressure)

Gestational diabetes (greatly increases the risk of heart attack)

Sleep apnea (causes aggressive heart disease that increases the risk of heart attack by 30 percent over five years)

Prior radiation to the chest (primarily for cancer of the left breast which can damage the heart)

Any person with one of these conditions should see a cardiologist in addition to their regular doctor.

Sources
Smeijers L, Mostofsky E, Tofler GH, et al. Anxiety and anger immediately prior to myocardial infarction and long-term mortality: Characteristics of high-risk patients. J Psychosom Res. 2017;93:19-27.
Schwartz BG, Qualls C, Kloner RA, K. Relation of total and cardiovascular death rates to the climate system, temperature, barometric pressure, and respiratory infection. Am J Cardiol, 2015;116(8):1290-1297.
Smyth A, O’Donnell M, Lamelas P, et al. Physical activity and anger or emotional upset as triggers of acute myocardial infarction: The INTERHEART Study. Circ, 2016;135(15):1059-1067.
http://emedicine.medscape.com/article/1513631-overview
http://www.medscape.com/viewarticle/412231

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The Health Benefits of Cocoa Extract

The Health Benefits of Cocoa Extract

A Sweet Solution for Heart Health?

Antioxidants found in cocoa may help to fight heart disease. As more and more studies reveal the heart-healthy benefits of cocoa extract, a growing number of purportedly good-for-you chocolate products are hitting the market. From cocoa supplements to fortified chocolate

bars, these products claim to lower blood pressure, keep cholesterol in check, and improve overall heart health. Here's a look at some of the research behind the health benefits of cocoa extract.

1) Cardiovascular Disease

Regular consumption of cocoa products containing flavanols (a class of compounds with antioxidant effects) may reduce a risk of heart disease, according to a research review published in 2008. The review's authors found that flavanol-containing products may produce positive changes in blood pressure, as well as improve function in platelets and the endothelium (a layer of cells lining the blood vessels).

Other research shows that regular consumption of cocoa extract may help protect against heart disease by decreasing oxidative stress (a destructive process that occurs when DNA-damaging free radicals overwhelm the body's ability to neutralize them).

A study published in the Journal of the American College of Cardiology involved 16 adults, all of whom had heart disease. Twice a day for 30 days, all study members drank a beverage with a high concentration of cocoa flavanols (a type of powerful antioxidant).

Later in the study, the participants drank a different, low-flavanol beverage twice a day for 30 days.

Study results showed a 47 percent greater improvement in vasodilation (widening of the blood vessels) during the first treatment period, indicating that cocoa flavanols may help repair damaged blood vessels and increase survival among heart disease patients.

2) Cholesterol

The cocoa extract may help raise levels of HDL ("good") cholesterol, suggests a 2007 study of 25 people with either normal cholesterol levels or mildly elevated cholesterol levels. For the study, researchers split participants into two groups: One group consumed 12 grams of sugar daily for 12 weeks, while the other group consumed 12 grams of sugar and 26 grams of cocoa powder daily for the same time period. Study results showed that those in the cocoa group had a significantly greater increase in HDL cholesterol, an effect known to reduce the risk of heart disease.

3) Diabetes

Following a flavanol-rich diet may help reverse blood vessel damage in people with diabetes, a small study published in 2008 shows. After 30 days of consuming flavanol-rich cocoa three times daily, a group of diabetes patients showed greater improvements in vascular function (compared to patients who weren't assigned to treatment with cocoa).

Should You Use Cocoa Extract?

More research needs to be conducted before cocoa extract can be recommended for disease prevention.

While eating dark chocolate in moderation may boost your intake of heart-healthy flavanols, it's important to limit your consumption of chocolate products containing high amounts of fat and sugar.

Previous studies suggest that garlic, fish oil, and hawthorn may also help to lower blood pressure.

If you're considering using supplements containing cocoa extract, make sure to consult your physician before beginning treatment. Self-treating and avoiding or delaying standard care can have serious consequences.

Sources:
Baba S, Osakabe N, Kato Y, Natsume M, Yasuda A, Kido T, Fukuda K, Muto Y, Kondo K. "Continuous intake of polyphenolic compounds containing cocoa powder reduces LDL oxidative susceptibility and has beneficial effects on plasma HDL-cholesterol concentrations in humans." Am J Clin Nutr. 2007 85(3):709-17.
Balzer J, Rassaf T, Heiss C, Kleinbongard P, Lauer T, Marx M, Heussen N, Gross HB, Keen CL, Schroeter H, Kelm M. "Sustained benefits in vascular function through flavanol-containing cocoa in medicated diabetic patients a double-masked, randomized, controlled trial." J Am Coll Cardiol. 2008 3;51(22):2141-9.
Erdman JW Jr, Carson L, Kwik-Uribe C, Evans EM, Allen RR. "Effects of cocoa flavanols on risk factors for cardiovascular disease." Asia Pac J Clin Nutr. 2008;17 Suppl 1:284-7.
Heiss C, Jahn S, Taylor M, Real WM, Angeli FS, Wong ML, Amabile N, Prasad M, Rassaf T, Ottaviani JI, Mihardja S, Keen CL, Springer ML, Boyle A, Grossman W, Glantz SA, Schroeter H, Yeghiazarians Y. Improvement of endothelial function with dietary flavanols is associated with mobilization of circulating angiogenic cells in patients with coronary artery disease. J Am Coll Cardiol. 2010 Jul 13;56(3):218-24. doi: 10.1016/j.jacc.2010.03.039.
Mathur S, Devaraj S, Grundy SM, Jialal I. "Cocoa products decrease low-density lipoprotein oxidative susceptibility but do not affect biomarkers of inflammation in humans." J Nutr. 2002 132(12):3663-7.
National Institutes of Health. "Researchers Ask, 'Is Chocolate Good for You?'". October 21, 2005.
Disclaimer: The information contained on this site is intended for educational purposes only and is not a substitute for advice, diagnosis or treatment by a licensed physician. It is not meant to cover all possible precautions, drug interactions, circumstances or adverse effects. You should seek prompt medical care for any health issues and consult your doctor before using alternative medicine or making a change to your regimen.

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Which Chocolate Products Are Heart Healthy?

Which Chocolate Products Are Heart Healthy?

It is common to hear today about the potential medical benefits of chocolate, in particular, that eating chocolate can help prevent cardiovascular disease. But not all chocolate is healthful.

Several studies have strongly suggested that the flavanols present in some chocolate products act as strong antioxidants, and also as stimulators of nitric oxide. As a result, the theory goes, inflammation may be reduced, platelet function can improve, and blood pressure may be reduced.

All these effects may reduce the risk of coronary artery disease, heart attacks, strokes, and even cancer.

Read more about chocolate and the heart.

What Is The Evidence?

Interest in the health benefits of chocolate was spurred a few decades ago by the recognition that Kuna Amerinds living on the San Blas Islands (near Panama), have a very low incidence of heart disease and cancer compared to Kuna living in mainland Panama. The difference? Those on the San Blas Islands consume large amounts of flavanol-rich cacao.

Several other epidemiological studies have supported the potential protective effects of flavanols present in chocolate products. A randomized trial began in 2015 (the Cocoa Supplement and Multivitamin Outcomes Study - COSMOS) will eventually provide much-needed prospective evidence on whether, and how much, cocoa flavanols are beneficial for our health.

What Are The Common Forms Of Chocolate?

There are many varieties of chocolate products, and the flavonol content varies tremendously among them.

If science eventually is able to prove that chocolate-associated flavanols are healthy, we will need to be aware that a lot of the chocolate we consume contains only a tiny amount of the healthy stuff.

Cacao comes from the raw seeds of the Theobroma cacao tree. Cacao is extremely rich in the flavanols catechin and epicatechin - which are the substances thought to confer cardiovascular benefits.

Cacao is the stuff consumed by the Kuna Amerinds.

Cocoa consists of cacao seeds that have been ground up and roasted. Most cocoa products available to consumers has been further processed to remove the bitterness and add sweetness. Since the bitterness of cocoa is largely due to the flavanols, commercial cocoa products contain relatively small amounts of flavanols.

Chocolate is made by further processing of cocoa, mainly by adding sugar and fat.

Milk chocolate is a highly processed and sweetened product and is often subjected to a process of alkalinization ( or Dutching), which specifically removes flavanols to produce a smooth and sweetened product.

White chocolate is cocoa butter that has been removed from cacao seeds. It contains no chocolate solid products at all, specifically, it contains no flavanols, and should not be considered a true form of chocolate.

Dark chocolate is a chocolate product that is less processed than milk chocolate. It tends to contain more flavanols than milk chocolate, and partly, for this reason, it tends to be more bitter and less sweet than milk chocolate.

However, we should note that the actual “darkness” of chocolate has nothing to do with flavanol content - lots of Dutch-processed milk chocolate is quite dark in color.

Read about dark chocolate and health.

Notably, the stuff that is being used in the COSMOS study is not chocolate at all but is a cocoa flavanol supplement.

So Which Chocolate Products Are Good For Us?

Even assuming that studies like COSMOS will eventually demonstrate once and for all that cocoa-associated flavanols are heart healthy, we need to be aware that most of the chocolate and cocoa we can purchase today have had much of their flavanol content removed during processing.

At this point, it is generally very difficult for us to judge the flavanol content of commercially available chocolate and cocoa products. The Mars company seems the most serious about promoting the health benefits of chocolate and has introduced its flavanol-rich CocoaVia product line as a first step. CocoaVia products reveal their flavanol content on the product labels. Mars is also a sponsor of the COSMOS study, and presumably, is providing the flavonol supplement being used in that study. The Hershey company also claims its Special Dark chocolate product has a good flavanol content but has not published what that content actually is.

If chocolate manufacturers are serious about promoting chocolate as a healthy product, they will need to begin producing more flavanol-rich products, and label the flavanol content in the packaging.

In the meantime, we should keep in mind that despite all the hype, most of the chocolate we can purchase today is not medicinal. It’s candy.

Calories in chocolate candy.

Sources:
Dillinger TL, Barriga P, Escarcega S, Jiminez M, Salazar Lowe D, Grivetti LE. Food of the gods: the cure for humanity? A cultural history of the medicinal and ritual use of chocolate. J Nutr. 2000;130:2057S-2072S.
Latif R. Chocolate/cocoa and human health: a review. Neth J Med. 2013;71:63-68.
Grassi D, Necozione S, Lippi C, et al. Cocoa reduces blood pressure and insulin resistance and improves endothelium-dependent vasodilation in hypertensives. Hypertension. 2005;46:398-405.
Taubert D, Berkels R, Roesen R, Klaus W. Chocolate and blood pressure in elderly individuals with isolated systolic hypertension. JAMA. 2003;290:1029-1030.

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Smoking And Your Heart

Smoking And Your Heart

By Richard N. Fogoros, MD - Reviewed by a board-certified physician.
Updated April 26, 2016

Smoking tobacco is the strongest risk factor for developing heart disease.

In fact, the risk of having a heart attack is six times higher in smokers -- both men and women -- than in

people who never smoked. Worldwide, smoking is thought to account for almost 40% of first heart attacks.

Read about the risk factors for heart disease.
Not only does smoking cause heart disease, but once you develop heart disease, continuing to smoke makes it much worse, much faster.


People who keep smoking after a heart attack have a much higher risk of subsequent heart attacks. People who smoke after bypass surgery or stenting have a much higher incidence of developing occlusion of the bypassed or stented artery. Smokers with coronary artery disease (CAD) or heart failure have a substantially higher risk of premature death than non-smokers with these conditions.

How Does Smoking Cause Heart Disease?

Smoking tobacco greatly accelerates atherosclerosis, the disease process that produces CAD, heart failure, peripheral vascular disease, stroke, abdominal aortic aneurysms, and sudden death.

Smoking accelerates atherosclerosis in several ways:

Smoking increases LDL cholesterol (bad cholesterol) levels and reduces HDL cholesterol (good cholesterol).
Tobacco products contain chemicals that can irritate the blood vessel walls, increasing inflammation, damaging and "stiffening" the vessel walls -- all conditions that are associated with atherosclerosis.
Smoking increases adrenaline levels, which raises the blood pressure and cardiac stress, causing constriction of blood vessels.
Smoking abnormally increases the tendency of blood to form clots within blood vessels, thus increasing the risk of acute coronary syndrome (ACS).
In addition to accelerating atherosclerosis, smoking tobacco has other deleterious effects on the cardiovascular system.


The nicotine in tobacco contributes to the increase in heart rate and blood pressure seen after smoking a cigarette.

The Acute Effects Of Smoking A Cigarette
Several of the deleterious effects that are produced by smoking are relatively acute. Changes in the heart rate and blood pressure, the negative clotting effects, and even some of the chemical changes within the blood vessels can occur immediately when you light up.

The Cardiac Benefits Of Smoking Cessation
Just as smoking tobacco accelerates atherosclerosis, if you quit smoking you can slow the progression of atherosclerosis. Furthermore, smoking cessation actually substantially improves the overall function of your blood vessels. The risk of developing cardiovascular disease drops quickly after you quit smoking, and continues dropping the longer you remain tobacco-free.

After an episode of ACS, smokers who quit immediately have a much lower risk of dying in the near future, as compared to smokers who do not quit. Quitting also substantially reduces your risk of having a further episode of ACS.


Your risk of stroke also becomes substantially reduced over time after you quit smoking.

The benefits of smoking cessation are seen in both men and women in all age groups.

Why You Should Quit Right Now
Many of the adverse effects of smoking occur acutely -- right after you light up. This means that your chances of having an acute heart attack will actually diminish within 24 - 48 hours after your last smoke.

So not only should you quit smoking, you should quit smoking as soon as you possibly can.

Read more about why it is important to quit smoking right now.
Get help in quitting.

Sources:
Ambrose, JA, Barua, RS. The pathophysiology of cigarette smoking and cardiovascular disease: an update. J Am Coll Cardiol 2004; 43:1731.
Ockene, IS, Miller, NH. Cigarette smoking, cardiovascular disease, and stroke: a statement for healthcare professionals from the American Heart Association. American Heart Association Task Force on Risk Reduction. Circulation 1997; 96:3243.

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What are the Benefits of Drinking Beet Juice?

What are the Benefits of Drinking Beet Juice?

Health Benefits, Uses, Side Effects & More

What is Beet Juice?

Beet juice (also known as "beetroot juice") is rich in essential nutrients such as folate, potassium, and vitamin C. In juicing or juice fasts, beet juice is typically blended with other vegetables and fruits to achieve certain health effects.

Benefits of Beet Juice

So far, scientific support for the benefits of beet juice is lacking. Here's a look at several beet juice benefits researched in scientific studies.

                                                 
1) Lower Blood Pressure   

Drinking just over two cups of beet juice daily may help keep your blood pressure in check, according to a 2008 study. Within three hours of drinking 500 millilitres (about 17 ounces) of beet juice, volunteers showed a significant decrease in blood pressure. What's more, that drop in blood pressure was sustained for up to 24 hours after the juice was consumed.

The study's authors suggest that nitrate—a nutrient found in green, leafy vegetables in addition to beets—may be responsible for beet juice's blood-pressure-lowering effects.

2) Stamina

In a small study published in 2009, scientists discovered that drinking beet juice may boost exercise stamina. For the study, eight men drank 500 millilitres of beet juice daily for six consecutive days before undergoing a series of cycling-based fitness tests. Results showed that the participants were able to cycle for an average of 92 seconds longer after drinking beetroot juice (compared to their cycling time after drinking blackcurrant cordial for six consecutive days).

The researchers also observed that study members had lower resting blood pressure after drinking beet juice.

3) Inflammation

Beet juice may benefit obese people by kerbing inflammation (a risk factor for cardiovascular disease, type 2 diabetes, and cancer), according to a study published in 2009. The study also showed that beet juice may fight free radicals (chemical by-products known to damage DNA).

Beet Juice Recipes

Since beet juice has such a strong flavour, it should be blended with other juices (such as carrot, apple, and lemon) before drinking.

Learn about other ingredients to use in juicing.

Using Beet Juice for Health

Although it's too soon to recommend beet juice for health purposes, increasing your intake of beets in your diet (as well as other vegetables) may help enhance your overall health. 

Keep in mind that alternative medicine should not be used as a substitute for standard care. Self-treating a condition and avoiding or delaying standard care may have serious consequences.

_Sources

_{Bailey SJ, Winyard P, Vanhatalo A, Blackwell JR, Dimenna FJ, Wilkerson DP, Tarr J, Benjamin N, Jones AM. "Dietary nitrate supplementation reduces the O2 cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans." Journal of Applied Physiology 2009 Aug 6.}

_{Webb AJ, Patel N, Loukogeorgakis S, Okorie M, Aboud Z, Misra S, Rashid R, Miall P, Deanfield J, Benjamin N, MacAllister R, Hobbs AJ, Ahluwalia A. "Acute blood pressure lowering, vasoprotective, and antiplatelet properties of dietary nitrate via bioconversion to nitrite." Hypertension. 2008 Mar;51(3):784-90.}

_{Zielińska-Przyjemska M, Olejnik A, Dobrowolska-Zachwieja A, Grajek W. "In vitro effects of beetroot juice and chips on oxidative metabolism and apoptosis in neutrophils from obese individuals." Phytotherapy Research 2009 Jan;23(1):49-55.}

Disclaimer: The information contained on this site is intended for educational purposes only and is not a substitute for advice, diagnosis or treatment by a licensed physician. It is not meant to cover all possible precautions, drug interactions, circumstances or adverse effects. You should seek prompt medical care for any health issues and consult your doctor before using alternative medicine or making a change to your regimen.

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The Blood Type Diet

The Blood Type Diet

The blood type diet is an eating plan sometimes used in alternative medicine to promote weight loss. Also said to fight disease, the blood type diet is based on the theory that your blood type determines which foods you should consume in order to achieve optimal health.

What is the History of the Blood Type Diet?

The blood type diet was developed by Peter D'Adamo, a naturopathic physician who theorizes that people respond to various foods depending on their blood type.

The theory behind the diet is the belief that eating foods with lectins (a type of protein) that are incompatible with a person's blood type can cause blood cell clumping, called agglutinization, and result in health problems such as heart or kidney disease or cancer. D'Adamo also theorizes that a person's blood type affects their ability to digest various foods due to differences in digestive secretions associated with the different blood types. Blood type O, for example, are thought to digest meat well due to high levels of stomach acid. 

By eating according to a meal plan designed for your specific blood type, D'Adamo suggests, you can digest food with greater efficiency, avoid the negative effect of certain lectins, and—in turn—lose weight and enhance your overall health.

What Does the Blood Type Diet Involve? 

Here are the basic principles of the blood type diet:

• People with blood type A (which D'Adamo calls the "cultivator") should follow a dairy-free, primarily vegetarian diet with a high intake of fruits, vegetables, grains, beans, legumes, nuts, and seeds

• People with blood type B ("the nomad") should eat a highly varied diet (including fruits, vegetables, grains, beans, legumes, meat, poultry, fish, eggs, and dairy) but avoid intake of nuts and seeds
• People with blood type AB ("the enigma") can consume any food recommended for blood types A and B, although aiming for a mainly vegan diet is advised for this type

• People with blood type O ("the hunter") should stick to a dairy-free and grain-free diet high in meat, low in grains, and with a moderate amount of vegetables, eggs, nuts, and seeds

Overall, the blood type diet emphasizes whole foods and minimizes intake of processed foods. 

The blood type diet also includes exercise guidelines. For example, relaxing exercises like yoga and tai chi are recommended for blood type A, moderate-intensity activities like walking and tennis are recommended for blood type B, a combination of calming and moderate-intensity exercises are recommended for blood type AB, and vigorous activities like running are recommended for blood type O.

The Benefits of the Blood Type Diet

Proponents claim that the blood type diet can help you burn fat more efficiently, increase your energy levels, stimulate your immune system, promote weight loss, and lower your risk of major health problems like heart disease and cancer. However, there's currently a lack of scientific evidence to support such claims.

The available research on the blood type diet includes a study published in the journal PLoS One in 2014. For the study, 1,455 participants filled out questionnaires designed to determine how frequently they'd consumed certain foods during a one-month period.

In their analysis of the questionnaires, researchers found that following a diet similar to the diet prescribed for blood type A or blood type AB was associated with lower blood pressure and lower cholesterol levels. Following a diet similar to the diet prescribed for blood type O was associated with lower levels of triglycerides (high levels of this blood fat have been associated with an increased risk of cardiovascular disease), while no significant association was found for the blood type B diet.

Since these associations occurred independently of the participants' blood types, the study's authors state that their findings do not back up the overall theory behind the blood type diet.

While this study suggests that the blood type diet may have beneficial effects for some individuals, a research review published in the American Journal of Clinical Nutrition in 2013 found that further research is needed to support any of the health claims associated with the blood type diet. For the review, scientists looked at 16 previously published reports on the blood type diet and concluded that "no evidence currently exists to validate the purported health benefits of blood type diets." 

Caveats

Since the diets prescribed for blood types A and O are very restrictive, there's some concern that individuals following these diets may fail to achieve sufficient intake of many vitamins and minerals that are essential for health. Although proponents of the blood type diet suggest that use of dietary supplements can help dieters meet their nutritional needs, such supplements are not regarded as a reasonable substitute for a healthy, balanced meal plan.

Trying the Blood Type Diet

While the blood type diet may offer some benefits in certain cases, following a health regimen that combines sensible calorie restriction and regular exercise is generally considered the most effective strategy for weight loss. If you're considering trying it, make sure to talk with your primary care provider first.

_Sources

_{Cusack L1, De Buck E, Compernolle V, Vandekerckhove P. "Blood type diets lack supporting evidence: a systematic review." Am J Clin Nutr. 2013 Jul;98(1):99-104.}

_{Wang J, García-Bailo B, Nielsen DE, El-Sohemy A. "ABO genotype, 'blood-type' diet and cardiometabolic risk factors." PLoS One. 2014 Jan 15;9(1):e84749.}

Disclaimer: The information contained on this site is intended for educational purposes only and is not a substitute for advice, diagnosis or treatment by a licensed physician. It is not meant to cover all possible precautions, drug interactions, circumstances or adverse effects. You should seek prompt medical care for any health issues and consult your doctor before using alternative medicine or making a change to your regimen.

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