Diet & Nutrition
Why Calorie Restriction May Extend the Lifespan
A study led by Harvard School of Public Health researchers and published online December 2014 in Cell identifies a key molecular mechanism behind the health benefits of dietary restriction, or reduced food intake without malnutrition. Also called as calorie restriction, dietary restriction is best known for its ability to slow aging in laboratory animals. The findings here show that restricting two amino acids, methionine and cysteine, results in increased hydrogen sulfide (H2S) production and protection against ischemia reperfusion injury, damage to tissue that occurs following the interruption of blood flow as during organ transplantation and stroke. Increased H2S production upon dietary restriction was also associated with lifespan extension in worms, flies, and yeast.
Although H2S gas is extremely toxic in high amounts, low levels present in naturally occurring sulfur springs have long been associated with health benefits. Mammalian cells also produce low levels of H2S, but this is the first time that this molecule has been linked directly to the health benefits of dietary restriction.
A release from Harvard quotes senior author James Mitchell, associate professor of genetics and complex disease, as saying, “This finding suggests that H2S is one of the key molecules responsible for the benefits of dietary restriction in mammals and lower organisms as well. While more experiments are required to understand how H2S exerts its beneficial effects, it does give us a new perspective on which molecular players to target therapeutically in our efforts to combat human disease and aging.”
Dietary restriction is a type of intervention that can include reduced overall food intake, decreased consumption of particular macronutrients such as protein, or intermittent bouts of fasting. It is known to have beneficial health effects, including protection from tissue injury and improved metabolism. It has also been shown to extend the lifespan of multiple model organisms, ranging from yeast to primates. The molecular explanations for these effects are not completely understood, but were thought to require protective antioxidant responses activated by the mild oxidative stress caused by dietary restriction itself.
First author Christopher Hine, research fellow in the Department of Genetics and Complex Diseases, and colleagues demonstrated that one week of dietary restriction increased antioxidant responses and protected mice from liver ischemia reperfusion injury, but surprisingly, this protective effect was intact even in animals that could not mount such an antioxidant response. Instead, the researchers found that the protection required increased production of H2S, which occurred upon reduction of dietary intake of the two sulfur-containing amino acids, methionine and cysteine. When the diet was supplemented with these two amino acids, increased H2S production and dietary restriction benefits were both lost.