From: Dr. Jeff
Subject: New Protein Study
KimMarie
New study on protein intake that puts a new spin on some fad diets such as Paleo, and Atkins. This is a little long but worth the read.
Researchers at the University of Southern California's Davis School of Gerontology believe high protein consumption in middle age could mean a much higher risk of death from cancer and diabetes. The study followed 6,318 adults from a variety of ethnicities and health histories over two decades and found those with diets high in animal proteins were just as likely to die as a result of cancer as a regular smoker, according to a university release
The USC study defined low-protein diets as those where 10 percent of calories or less come from protein, and high-protein diets as those with 20 percent or more calories coming from protein. But even moderate-protein diets in middle age were shown to result in three times the likelihood of death from cancer.
"The majority of Americans are eating about twice as much proteins as they should, and it seems that the best change would be to lower the daily intake of all proteins but especially animal-derived proteins," Longo said. "But don't get extreme in cutting out protein; you can go from protected to malnourished very quickly."
Longo's findings support recommendations from several leading health agencies to consume about 0.8 grams of protein per kilogram of body weight every day in middle age. For example, a 130-pound person should eat about 45-50 grams of protein a day, with preference for those derived from plants such as legumes, Longo explains.
The researchers define a "high-protein" diet as deriving at least 20 percent of calories from protein, including both plant-based and animal-based protein. A "moderate" protein diet includes 10-19 percent of calories from protein, and a "low-protein" diet includes less than 10 percent protein.
Even moderate amounts of protein had detrimental effects during middle age, the researchers found. Across all 6,318 adults over the age of 50 in the study, average protein intake was about 16 percent of total daily calories with about two-thirds from animal protein — corresponding to data about national protein consumption. The study sample was representative across ethnicity, education and health background.
People who ate a moderate amount of protein were still three times more likely to die of cancer than those who ate a low-protein diet in middle age, the study shows. Overall, even the small change of decreasing protein intake from moderate levels to low levels reduced likelihood of early death by 21 percent.
The study also pinpointed animal proteins as the culprit behind the 74 percent increased risk of death within the study period, from any cause. Even when controlling the amount of fats and carbs in the participants' diets, high animal protein diets had negative health effects. Animal proteins include things like meats, cheeses, milk, and eggs. Diets high in plant-based proteins, however, including foods like beans, lentils, and nuts, did not have the same dangerous effects as animal proteins.
"The research shows that a low-protein diet in middle age is useful for preventing cancer and overall mortality, through a process that involves regulating IGF-I and possibly insulin levels," study co-author Eileen Crimmins said in a release.
This study interestingly does not contradict the Perlmutter diet we recommend @ the Center. Schedule a nutritional consultation today.
