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D. Why Calorie Restrictive Diets May Not Suit People

Narrator: This is Science Today. In a society often described as youth-obsessed, American consumers are bombarded with anti-aging products, whether they be to erase wrinkles or to increase lifespan. University of California, Berkeley nutrition expert, Joanne Ikeda, says one of the anti-aging diets gaining widespread attention is based on calorie restriction diets in rats that were found to increase longevity.

Ikeda: And so based on this, there had been some anti-aging diet books written with a claim that people can lengthen their lifespan to 120 years or even 150 years!

Narrator: But Ikeda says that when the calorie restriction diets were later tested in a yearlong study of men, the research revealed that the men became more irritable and withdrawn.

Ikeda: What this study tells us is when you restrict your calorie intake, it does have profound effects on your psychological and social well-being.

Narrator: For Science Today, I'm Larissa Branin.