I thought this was intersting re protocol.
Despite her reservations about recommending CR, Anderson praised the work of the research team in the Science Translational Medicine study for “pushing this forward for possible application in clinics.” In that study, test subjects followed a carefully designed 50 percent calorie restricted diet (totaling about 1,100 calories on the first day and 70 percent (about 700 calories) on the next four days, then ate whatever they wanted for the rest of the month.
Longo, the gerontologist at U.S.C., says the underlying theory of the on-again/off-again approach is that the regenerative effects of the regimen occur not so much from the fasting itself as from the recovery afterward. By contrast, long-term, uninterrupted calorie restriction can lead to the sort of negative effects seen in extreme conditions like anorexia.
The calorie-restricted diet in Longo’s study was 100 percent plant-based and featured vegetable soups, energy bars, energy drinks and a chip snack as well as mineral and vitamin supplements. It included nutrients designed to manipulate the expression of genes involved in aging-related processes, Longo explains. (Longo and U.S.C. are both owners of L-Nutra, the company that manufactures the diet. But he says he takes no salary or consulting fees from the company and has assigned his shares to a nonprofit organization established to support further research.)
Even the five-day-a-month calorie restriction regimen was apparently a struggle for some test subjects, resulting in a 25 percent dropout rate. But health benefits in the form of decreased body mass and better levels of glucose, triglycerides and cholesterol, along with other factors, showed up after the third month and persisted for at least three months—even after subjects had returned full-time to a normal diet. Notably, given concerns about other forms of calorie restriction, lean muscle mass remained unchanged.
The benefits were greater for people who were obese or otherwise unhealthy, Longo says. But those individuals might also need to repeat the five-day regimen as often as once a month to the point of recovery, he adds, whereas individuals who are already healthy and athletic might repeat it just twice a year.
