sciencehabit writes: Slash your food intake and you can live dramatically longer—at least if you're a mouse or a nematode. But a major study designed to determine whether this regimen, known as caloric restriction, works in primates suggests that it improves monkeys' health but doesn't extend their lives. Researchers not involved with the new paper say the results are still encouraging. Although the monkeys didn't evince an increase in life span, both studies show a major improvement in "health span," or the amount of time before age-related diseases set in. "I certainly wouldn't give up on calorie restriction as a health promoter" based on these findings, says molecular biologist Leonard Guarente of the Massachusetts Institute of Technology in Cambridge.