Health Studies

A growing body of research shows that people of African heritage eating traditional foods are healthier than those who adopt a typical Western diet. We've listed a sampling of this research below, categorized by issues.

Traditional African Diet May Reduce Colon Cancer Risk

Colon cancer, the second leading cause of cancer death in the US, affects a greater proportion of African Americans than rural Africans, indicating that diet plays an important role in disease prevention. To see how traditional diets affect risk factors for colon cancer, researchers assigned 20 middle aged African Americans to a traditional, African heritage diet (averaging 55g fiber daily and 16% calories from fat, with foods like mangos, bean soup, and fish) and 20 middle aged rural South Africans to a typical American diet (averaging 12g fiber daily and 52% calories from fat, with foods like pancakes, burgers, fries, and meatloaf). In just 2 short weeks, the African Americans reduced the inflammation of their colons, improved their markers for cancer (including increased levels of butyrate, an anti-cancer chemical), and increased the diversity of their healthy gut bacteria. On the other hand, the rural Africans eating an American diet fared worse, producing more bile acid (a risk factor for colon cancer), while decreasing the diversity of healthy gut bacteria. These results indicate that an African heritage diet can help promote a healthy digestive tract (potentially reducing colon cancer risk), and that rapid improvements can come with a change to healthier foods.
Nature Communications. 2015 Apr 28;6:6342. (O’Keefe SJ et al.)

Leafy Greens Can Keep Your Brain Young

It is no secret that green vegetables are some of the healthiest foods for our bodies, but new research shows that they are also good for our brains. Researchers in Chicago and Boston analyzed the eating patterns and cognitive abilities of over 950 older adults for an average of five years. The scientists found a significant decrease in the rate of cognitive decline for people who ate more green leafy vegetables (like spinach, kale, collards, and mustard greens). In fact, people who ate just one to two servings of leafy greens per day had the cognitive ability of a person 11 years younger than those who ate none.

Presentation at the American Society for Nutrition (ASN) Annual Meeting during Experimental Biology. Boston MA. March 30, 2015.

Peanuts Linked to Lower Mortality Across Different Ethnicities

Nuts and peanuts (technically legumes) are largely recognized as health promoting foods, but experts wondered if these benefits extend across all ethnic groups and income levels. In this study, researchers at Vanderbilt University analyzed nut intake in over 200,000 people, including a large group of Asian men and women in China, and a large group of low-income black and white men and women in the southeastern United States. For those with the highest nut consumption (mostly peanuts), mortality from all causes significantly decreased 17-21%, depending on ethnicity. Death from heart disease specifically (including ischemic heart disease) also significantly decreased across all ethnic groups for those eating the most nuts. The researchers identified this study as “strong evidence that the association of nut/peanut consumption with mortality does not vary by ethnicity “ or income level. Additionally, they conclude that “consumption of nuts, particularly peanuts given their general affordability, may be considered a cost-effective measure to improve cardiovascular health.”
JAMA Internal Medicine. 2015 Mar 2. [Epub ahead of print] (Luu HN et al.)

Lower Incidence of Diabetes in Vegetarians

A 2011 study examined the relationship of diet to incidence of diabetes among Black and non-Black participants in the Adventist Health Study-2.  The study participants included 15,200 men and 26,187 women (17.3% black) living in the US and Canada who were free of diabetes. Participants provided demographic, anthropometric, lifestyle and dietary data, while a follow-up questionnaire two years later elicited information on the development of diabetes.  Participants were grouped as vegan, lacto ovo vegetarian, pesco vegetarian, semi-vegetarian or non-vegetarian (reference group). The questionnaire results showed that vegetarian diets (vegan, lacto ovo and semi) were all associated with a substantial and independent reduction in diabetes incidence.  Blacks have long been associated with having an increased risk for diabetes.  The results of this study showed that the protection provided against diabetes from the consumption of vegetarian diets was as great as the excess risk associated with Black ethnicity.
Nutrition, Metabolism and Cardiovascular Diseases 2011 Oct 7. (Tonstad et al.)

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