Fasting review finds modest, uneven changes in blood fats
Time-restricted eating may lower triglycerides, but cholesterol findings were inconsistent and the review cannot show that fasting prevents cardiovascular disease.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Across the included meta-analyses, intermittent fasting showed modest potential to lower triglycerides, with less consistent effects on cholesterol measures. Time-restricted eating appeared more promising for triglycerides, particularly in people with overweight. Differences in fasting patterns, control groups and follow-up limit confidence in the size and clinical relevance of these changes.
The abstract provides no pooled effect sizes or confidence intervals. The authors highlight substantial variation across studies and short follow-up, which prevent firm conclusions about lasting effects or the best fasting regimen.
The pattern differed by regimen
Time-restricted eating had limited effects on LDL, HDL and total cholesterol. Alternate-day fasting results were inconsistent. Ramadan fasting showed modest triglyceride and HDL improvements, so the findings do not describe a uniform response to fasting.
Clinical questions remain open
The review assessed lipid measurements, without reporting cardiovascular event rates. Its suggestion that time-restricted eating may work better alongside calorie restriction does not establish that fasting itself accounts for the observed changes.
The original publication
The impact of intermittent fasting on lipid profile - an umbrella review.
Popiolek-Kalisz J, Kwasny A
Nutr Metab Cardiovasc Dis · 2026
- PubMed ID
- 41475991
- Record checked
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