NEW YORK, July 14 — For decades, the idea that eating less could help you live longer has hovered at the edge of mainstream science, part tantalizing possibility, part fad diet hype. Now, a new wave of research is giving us a clearer—and more complicated—picture of what caloric restriction actually does for human health. The concept isn’t new.
Caloric restriction—reducing calorie intake without malnutrition—was first systematically studied in 1935 by Clive McCay at Cornell University. His work showed that rats on restricted diets lived longer.
Since then, studies in mice, worms (a species called C. elegans), and fruit flies have reported lifespan extensions ranging from 20 to 50 percent. In plain terms, the animal evidence has been striking enough to keep scientists interested for nearly a century. But here’s the thing: humans are not lab rats.
And the most rigorous human study to date, known as the CALERIE trial, gave researchers a much more measured result. The CALERIE trial—short for Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy—was funded by the National Institutes of Health and ran from 2007 to 2012.
It enrolled 218 healthy, non-obese adults between the ages of 21 and 50. Participants cut their calorie intake by 25 percent for two years. The results, published in 2015, showed improvements in several health markers: participants lost an average of 7.2 kilograms of body weight, experienced lower blood pressure, and showed reduced oxidative stress.
But here’s the key finding: there was no significant change in lifespan. So what does that mean for the average person? Think of it like this: caloric restriction appears to be a powerful tool for improving healthspan—the years you spend in good health—even if it hasn’t been proven to extend maximum lifespan in humans.
Even the animal studies aren’t entirely straightforward. Two long-term studies of rhesus monkeys, both started in the late 1980s, produced conflicting results.
The University of Wisconsin study, which began in 1989, reported increased lifespan among monkeys on restricted diets. But the National Institute on Aging study, started in 1987, found no significant effect on lifespan. The practical upshot, as of 2024: no human study has demonstrated that caloric restriction extends maximum lifespan.
What it does seem to do, based on the best evidence we have, is improve markers of health—things like blood pressure and oxidative stress that are linked to age-related disease. For researchers, the next big question is whether there’s a way to get the health benefits of caloric restriction without the difficulty of sustained, severe dieting.
That’s where the field is heading. But for now, the message from the science is clear: cutting calories can improve your health, but the promise of dramatically longer life remains unproven in humans. Consult your doctor for medical advice.
Sources
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