Most diet advice focuses on calories and nutrients, but new research suggests that when you eat may be just as important.

That’s one conclusion of a new study by Dr. Satchidananda Panda, an associate professor at the Salk Institute for Biological Studies, in La Jolla, Calif. Mice that were forced to limit how many hours they ate were thinner than mice that chowed down whenever they wanted, Dr. Panda’s team found. This was true no matter what kind of unhealthy diet the mice ate.

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