Intermittent Fasting Reduces Body Weight Versus Ad Libitum Diet
By Elana Gotkine HealthDay Reporter
MONDAY, June 30, 2025 -- Intermittent-fasting strategies yield small reductions in body weight compared with an ad libitum diet, according to a study published online June 18 in The BMJ.
Zhila Semnani-Azad, Ph.D., from the Harvard T.H. Chan School of Public Health in Boston, and colleagues examined the effect of intermittent-fasting diets with continuous energy restriction or unrestricted (ad libitum) diets on intermediate cardiometabolic outcomes in a systematic review and network meta-analysis. The study included 99 randomized clinical trials involving 6,582 adults.
The researchers found that when compared with an ad libitum diet, all intermittent-fasting and continuous energy restriction diet strategies reduced body weight. Alternate-day fasting was the only form of intermittent-fasting diet strategy to show benefit in body weight reduction compared with continuous energy restriction (mean difference, −1.29 kg). Alternate-day fasting showed a trivial reduction in body weight when compared with both time-restricted eating and whole-day fasting (mean difference, −1.69 and −1.05 kg). Among trials with less than 24 weeks follow-up, estimates were similar, but benefits in weight reduction were only seen in diet strategies compared with ad libitum in moderate-to-long-term trials (≥24 weeks). Compared with time-restricted eating, alternate-day fasting lowered total cholesterol, triglycerides, and nonhigh-density lipoprotein in comparisons between intermittent-fasting strategies. Time-restricted eating resulted in a small increase in total cholesterol, low-density lipoprotein cholesterol, and nonhigh-density lipoprotein cholesterol compared with whole-day fasting.
"In our analysis, intermittent-fasting strategies showed trivial to small improvements in body weight reduction," the authors write.
Several authors disclosed ties to relevant organizations.
Disclaimer: Statistical data in medical articles provide general trends and do not pertain to individuals. Individual factors can vary greatly. Always seek personalized medical advice for individual healthcare decisions.
© 2025 HealthDay. All rights reserved.
Posted June 2025
Read this next
Urgent Care Visits Often Linked to Inappropriate Prescribing
MONDAY, July 21, 2025 -- Urgent care visits are often associated with inappropriate prescriptions of antibiotics, glucocorticoids, and opioids, according to a research letter...
Race Definitions Have Limited Impact on Cancer Rates in Whites, Blacks, Asians
MONDAY, July 21, 2025 -- Race definitions have limited impact on cancer rates for Whites, Blacks, and Asians, but do impact rates in multiracial individuals, according to a study...
Millions of Backyard Pools Recalled After Drowning Deaths of Nine Children
MONDAY, July 21, 2025 — Close to 5 million above-ground swimming pools have been recalled following the drowning deaths of nine children over two decades. The 48-inch and...
More news resources
- FDA Medwatch Drug Alerts
- Daily MedNews
- News for Health Professionals
- New Drug Approvals
- New Drug Applications
- Drug Shortages
- Clinical Trial Results
- Generic Drug Approvals
Subscribe to our newsletter
Whatever your topic of interest, subscribe to our newsletters to get the best of Drugs.com in your inbox.