Daily nut consumption linked to reduced death rate

In the largest study of its kind, people who ate a daily handful of nuts were 20 percent less likely to die from any cause over a 30-year period than were those who didn’t consume nuts, say scientists from Dana-Farber Cancer Institute, Brigham and Women’s Hospital, and the Harvard School of Public Health.

Their report, published in the New England Journal of Medicine, contains further good news. The regular nut-eaters were found to be more slender than those who didn’t eat nuts, a finding that should alleviate the widespread worry that eating a lot of nuts will lead to overweight…

“The most obvious benefit was a reduction of 29 percent in deaths from heart disease — the major killer of people in America,” said Charles S. Fuchs, MD…the senior author of the report. “But we also saw a significant reduction — 11 percent — in the risk of dying from cancer,” added Fuchs…

Whether any specific type or types of nuts were crucial to the protective effect couldn’t be determined. However, the reduction in mortality was similar both for peanuts and for “tree nuts” — walnuts, hazelnuts, almonds, Brazil nuts, cashews, macadamias, pecans, cashews, pistachios and pine nuts.

Several previous studies have found an association between increasing nut consumption and a lower risk of diseases such as heart disease, type 2 diabetes, colon cancer, gallstones, and diverticulitis. Higher nut consumption also has been linked to reductions in cholesterol levels, oxidative stress, inflammation, adiposity, and insulin resistance. Some small studies have linked increased nuts in the diet to lower total mortality in specific populations. But no previous research studies had looked in such detail at various levels of nut consumption and their effects on overall mortality in a large population that was followed for over 30 years.

For the new research, the scientists were able to tap databases from two well-known ongoing observational studies that collect data on diet and other lifestyle factors and various health outcomes. The Nurses’ Health Study provided data on 76,464 women between 1980 and 2010, and the Health Professionals’ Follow-up Study yielded data on 42,498 men from 1986 to 2010. Participants in the studies filled out detailed food questionnaires every two to four years…

“In all these analyses, the more nuts people ate, the less likely they were to die over the 30-year follow-up period,” explained Ying Bao, MD, ScD, of Brigham and Women’s Hospital, first author of the report. Those who ate nuts less than once a week had a seven percent reduction in mortality; once a week, 11 percent reduction; two to four times per week, 13 percent reduction; five to six times per week, 15 percent reduction, and seven or more times a week, a 20 percent reduction in death rate.

You can wander through the dry details over here. The findings are no surprise to anyone who approaches nutrition as an exercise in evolution and anthropology. We evolved as a species eating nuts and berries before we got round to agriculture. On the non-meat side of the ledger.

One more reason to celebrate George Washington Carver’s invention of peanut butter. 🙂

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