Eat More Purple Foods for Cancer Prevention and a Healthier Gut and Heart

This article was originally published by Dr. Mercola

Polyphenols1,2 (also known as phenolics) are phytochemicals, natural plant chemicals with powerful antioxidant properties. There are over 8,000 identified polyphenols found in foods such as tea, wine, chocolates, fruits and vegetables. Antioxidants3 — which in addition to polyphenols include carotenoids and allyl sulfides — help protect your cells from free radical damage, thereby controlling general aging and disease potential.

If your body does not get adequate protection, free radicals can cause cellular damage and dysfunction, raising your risk for chronic diseases such as heart disease, cancer and Alzheimer’s disease, just to name a few. Polyphenols can be broken down into four general categories — flavonoids, stilbenes, lignans and phenolic acids — with additional subgroupings4,5 based on the number of phenol rings they contain, and on the basis of structural elements that bind these rings to one another.

As a general rule, foods contain complex mixtures of polyphenols, with higher levels found in the outer layers of the plants, such as the skin.6 Polyphenols give fruits, berries and vegetables their vibrant colors and contribute to the bitterness, astringency, flavor, aroma and oxidative stability of the food.

The Role of Polyphenols in Human Health

In the human body, polyphenols have diverse biological functions and properties, including:,7,8

Fighting cancer cells9,10,11,12 and inhibiting angiogenesis13(the growth of blood vessels that feed a tumor) Protecting your skin against ultraviolet radiation
Fighting free radicals and reducing inflammation Promoting brain health14
Reducing the appearance of aging Protecting against dementia and Alzheimer’s disease15,16
Modulating your gut microbiome. Polyphenols have a prebiotic effect, nourishing beneficial bacteria17,18,19,20 Improving bone metabolism, reducing your risk for osteoporosis21,22
Promoting normal blood pressure and protecting your cardiovascular system, thereby lowering your risk for cardiovascular disease.23,24

Flavonoid polyphenols help to reduce the clumping of platelets in your blood and improve the function of your cells that line your arteries and veins25

Supporting normal blood sugar levels,26 stabilizing fat metabolism and reducing insulin resistance, thereby lowering your risk for Type 2 diabetes

As noted in a 2010 scientific review in the journal Nutrients:27

“Research in recent years strongly supports a role for polyphenols in the prevention of degenerative diseases, particularly cancers, cardiovascular diseases and neurodegenerative diseases … Recent studies have revealed that many of these diseases are related to oxidative stress from reactive oxygen and nitrogen species.

Phytochemicals, especially polyphenols, are the predominant contributor to the total antioxidant activities of fruits, rather than vitamin C. Polyphenols have been found to be strong antioxidants that can neutralize free radicals by donating an electron or hydrogen atom … Polyphenols … complement and add to the functions of antioxidant vitamins and enzymes as a defense against oxidative stress caused by excess reactive oxygen species (ROS).

Although most of the evidence of the antioxidant activity of polyphenols is based on in vitro studies, increasing evidence indicates they may act in ways beyond the antioxidant functions in vivo. Modulation of cell signaling pathways by polyphenols may help significantly to explain the mechanisms of the actions of polyphenol-rich diets.”

How Polyphenols Protect Your Heart Health

The research supporting polyphenols in the prevention and treatment of cardiovascular disease is particularly well-documented.28 For example, higher intakes of fruit-based flavonoids (specifically anthocyanin-rich foods — fruits and berries with a blue, red or dark purple hue — and those high in flavanones, particularly citrus fruits like grapefruit, lemons and oranges) has been found to lower the risk of nonfatal myocardial infarction and ischemic stroke in men.29

Keep in mind that to reap these benefits, you need to eat the whole fruit, not fruit juice, which is simply too high in fructose for optimal health. Excessive fructose is associated with insulin resistance and associated health problems, including diabetes and heart disease. Here’s a sampling of other studies showing how polyphenols helps protect your heart health:

  • A systematic review of 14 studies found intake of six classes of flavonoids: flavonols, anthocyanidins, proanthocyanidins, flavones, flavanones and flavan-3-ols, can significantly decrease your risk of heart disease30
  • Researchers have long puzzled over how flavonoids help prevent heart disease, but a study31 published last year suggests it has to do with the fact that metabolism of flavonoids enhances their bioactivity in endothelial cells, which form the lining of your blood vessels
  • Flavonoids also help to reduce the clumping of platelets in your blood.32 Platelet clumping is one potential precursor in heart attacks and angina
  • As antioxidants, polyphenols scavenge free radicals and reduce inflammation in your body
  • Polyphenols also inhibit vascular endothelial growth factor (VEGF), which causes complications with atherosclerotic plaques in the arteries, a factor in cardiovascular disease33

Purple Potatoes May Lower Risk for Colon Cancer

The study36,37 in question investigated the effects of purple potatoes in pigs fed a high-calorie diet, which has been linked to an increased risk of colon cancer. Pigs were fed one of three diets for 13 weeks:

  • High-calorie diet
  • High-calorie diet supplemented with raw or baked purple potatoes, rich in phenolic acids and anthocyanins — antioxidant compounds shown to have anticancer properties38
  • Standard control diet

Compared to the control diet, the high-calorie diet was (as expected) found to increase the level of interleukin-6 (IL-6), a proinflammatory protein known to promote cancer in the colon. The potato-supplemented diet, on the other hand, lowered IL-6 nearly sixfold compared to the control group. According to the authors:

“Anti-IL-6 therapeutics are available for treating colon cancer; however, they are expensive and induce negative side effects. Thus, whole foods could be a better way to combat low-grade chronic colonic inflammation and colon cancer. Whole plant foods have been shown to decrease chronic diseases due to the potential of anti-inflammatory dietary compounds acting synergistically.

We observed that supplementation of HCD [high-calorie diet] with anthocyanin-containing purple-fleshed potatoes, even after baking, suppressed HCD-induced IL-6 expression and … IL-6-related proteins … Our results highlight the importance of IL-6 signaling in diet-linked induction/prevention of colonic inflammation/cancer and demonstrate the potential of a food-based approach to target IL-6 signaling.”

Other research confirms the anticancer benefits of polyphenols, especially for colon cancer. A study39 published last year found polyphenols helped inhibit the proliferation of colon cancer cells and induce cancer cell apoptosis (programmed cell death) through oxidant-mediated mechanisms.

Health Benefits of Mulberry

Mulberries are also rich in polyphenols and other antioxidants. As far back as the Roman Empire, mulberries were used to treat diseases of the mouth, throat and lungs. Native Americans discovered them to have a laxative effect and used them to treat dysentery.47 I planted two twigs a few years back and now I have a mini forest of mulberry shrubs and harvest about 10 gallons of mulberries a year.

Nutritionally, mulberries contain an assortment of high-powered nutrients, such as vitamins A, B complex, C, E and K, each bringing their own constituents for health. They also contain iron, potassium and magnesium. One of the most beneficial resources in mulberries is resveratrol, said to “promote heart health and overall vitality.” According to the Institute for Traditional Medicine:48

“Traditionally, mulberry fruit has been used as a medicinal agent to nourish the yin and blood, benefit the kidneys and treat weakness, fatigue, anemia and premature graying of hair. It is also used to treat urinary incontinence, tinnitus, dizziness and constipation in the elderly and the anemic.”

In addition to historical uses, modern research has found mulberries can help improve your:

  • Digestive health: Mulberry contains 25 percent soluble fiber and 75 percent insoluble fiber. Both of these dietary fibers can help improve overall digestive health by promoting regular bowel movement and lowering your risk of stomach diseases49
  • Blood vessel health: Mulberry can help keep your blood vessels healthy thanks to its resveratrol content. This antioxidant helps increase the production of nitric oxide, which allows your vessels to relax50
  • Blood sugar control: Mulberry contains a special antioxidant called DNJ (1-deoxynojirimycin) that inhibits an enzyme in your gut that breaks down carbohydrates into sugar. Since it lowers the amount of sugar going into your system, it is considered beneficial for diabetics who want to control their condition51
  • Liver health: According to one study, mulberry can help prevent the buildup of fatty deposits around your liver, which can lower your risk of various hepatic diseases52


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