by Willow Tohi, Natural News:
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- A pooled analysis of five clinical trials found that an 8-hour time-restricted eating window led to greater weight loss than a 12-hour window or no time restriction.
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- Participants assigned to the 8-hour eating window lost approximately 3.7 more pounds than those in the 12-hour group over 3-6 months.
- Researchers observed improvements on blood pressure, blood sugar and cholesterol across all time-restricted eating groups.
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The evidence behind 16:8 fasting
A pooled analysis of five clinical trials published Sept. 12 in Nutrition & Diabetes has provided new data on time-restricted eating, a form of intermittent fasting that limits daily food consumption to a set window without necessarily restricting calories.
Researchers from multiple institutions analyzed data from 124 adults with metabolic syndrome who were tracked for three to six months. Participants had an average baseline eating window of about 15 hours daily. Those assigned to an 8-hour eating window lost approximately 3.7 pounds more than those with a 12-hour window and about 5 pounds more than a control group that received no time restrictions.
The 8-hour approach, commonly known as the 16:8 intermittent fasting protocol, involves fasting for 16 hours and eating within an 8-hour period, such as between 10 a.m. and 6 p.m. During the fasting period, only water, black coffee, black tea and herbal tea are permitted.
Modest effects on metabolic markers
The analysis found that shorter eating windows were associated with modest weight loss, with benefits extending to other cardiometabolic measures. A 10-hour eating window demonstrated a significant reduction in systolic blood pressure compared with the 12-hour window. A 2020 study published in Cell Metabolism similarly found that a 10-hour eating window reduced weight, blood pressure and cholesterol among adults with metabolic syndrome who were already taking medication.
The new findings suggest that alone, the benefits of time-restricted eating are generally modest. The effects should be viewed as one potential component of an overall lifestyle approach rather than a standalone treatment.
Considerations for special populations
Time-restricted eating may not be appropriate for everyone. Experts recommend caution for several groups:
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- People who are pregnant or nursing
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- Individuals with a history of eating disorders
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- Children and adolescents who are still growing
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- Older adults at risk for muscle loss who may have difficulty meeting nutritional needs
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- People with diabetes who use insulin or medications that can cause hypoglycemia
For diabetic patients on medication, changing eating patterns may require adjustments in medication dosage. A separate randomized controlled trial published in the Journal of Diabetes Investigation found that both 16:8 and 14:10 intermittent fasting protocols, followed three days per week for three months, led to significant improvements in weight, fasting blood sugar and lipid profiles in obese diabetic patients compared with a control group.
