High protein diets increase cancer risk via IGF-1

A board to discuss various diet-centered approaches to treating or controlling Multiple Sclerosis, e.g., the Swank Diet

High protein diets increase cancer risk via IGF-1

Postby NHE » Mon Dec 08, 2014 9:45 pm

This might be interesting news for people on Paleo diets. High animal protein diets were linked to a 400% increased cancer risk in people aged 50-65. They also experienced a 75% increase in mortality. The high animal protein diets also led to a 500% increase in diabetes mortality regardless of age.

Low protein intake is associated with a major reduction in IGF-1, cancer, and overall mortality in the 65 and younger but not older population.
Cell Metab. 2014 Mar 4;19(3):407-17.

    Mice and humans with growth hormone receptor/IGF-1 deficiencies display major reductions in age-related diseases. Because protein restriction reduces GHR-IGF-1 activity, we examined links between protein intake and mortality. Respondents aged 50-65 reporting high protein intake had a 75% increase in overall mortality and a 4-fold increase in cancer death risk during the following 18 years. These associations were either abolished or attenuated if the proteins were plant derived. Conversely, high protein intake was associated with reduced cancer and overall mortality in respondents over 65, but a 5-fold increase in diabetes mortality across all ages. Mouse studies confirmed the effect of high protein intake and GHR-IGF-1 signaling on the incidence and progression of breast and melanoma tumors, but also the detrimental effects of a low protein diet in the very old. These results suggest that low protein intake during middle age followed by moderate to high protein consumption in old adults may optimize healthspan and longevity.
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