A twelve-week trial at Johns Hopkins tracked adults with obesity and prediabetes who ate within a ten-hour window while maintaining constant calorie intake. The time-restricted group saw a median weight loss of 2.7 percent, which was essentially the same as the control group's 2.5 percent loss. Both groups also reported better food restraint and less stress eating, despite no significant differences in appetite hormones or inflammation markers.
The result suggests that simply narrowing the daily eating window can help people eat less overall, even when total calories are technically managed to prevent weight loss. But the lack of unique biological markers or greater weight loss compared to the control group implies the mechanism is mostly behavioral rather than metabolic. It is a modest tool for habit change, not a physiological shortcut.
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