Time-restricted eating has surged in popularity, with many people believing it improves heart health and metabolism beyond weight loss. But a small new study suggests the benefits may be more limited than expected. In a two-week trial of 31 overweight or obese women, intermittent fasting led to modest weight loss but did not improve blood sugar, blood pressure, cholesterol, or other key markers of heart health.
Participants followed one of two eating windows — either early in the day from 8 a.m. to 4 p.m. or later from 1 p.m. to 9 p.m. Importantly, they did not reduce calories. Researchers found that meal timing alone did not produce meaningful cardiometabolic changes, suggesting that many of fasting’s reported benefits may come from eating less overall rather than when meals occur. The eating windows did shift circadian rhythms, but the long-term impact of that change remains unclear.
Experts caution that the study was small and short, which limits what it can show. Time-restricted eating may still help some people over longer periods or when it naturally reduces calorie intake. But the findings suggest it isn’t a shortcut to better heart or metabolic health. For most people, food quality, portion size, and consistency over time still matter more than the clock.
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