James Warren wrote:

ScienceDaily (Dec. 6, 2012) — Scientists at the Gladstone Institutes have identified a novel mechanism by which a type
of low-carb, low-calorie diet -- called a "ketogenic diet" -- could delay the effects of aging. This fundamental
discovery reveals how such a diet could slow the aging process and may one day allow scientists to better treat or
prevent age-related diseases, including heart disease, Alzheimer's disease and many forms of cancer.

http://www.sciencedaily.com/releases...1206142025.htm

Drop low carb enough long enough and thyroid reduces T3 output. That
reduces basal metabolism. Lower metabolism is associated with better
lonevity. In rats and mice anyways it looks like super low carb is the
macro-nutrient most responsible for the long life of underfed test
subjects. Might work in humans.