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Nutrition
Meta-analysis of trials
Intermittent fasting vs. eating less every day
Reviewed by Joseph Korban, Certified Personal Trainer & Rehabilitation Specialist · Last reviewed 27 September 2026
Across 11 randomised trials (8 to 24 weeks), intermittent energy restriction and continuous calorie restriction produced comparable weight loss (difference -0.61 kg, 95% CI -1.70 to 0.47). Fasting insulin fell slightly more with intermittent fasting, but the clinical relevance is uncertain. The best plan is the one a person can sustain. Note that this review searched studies up to May 2018, so newer trials are not included.
What to know
- Intermittent fasting is an option, not a superior method.
- Total calories and consistency drive results.
- Not suitable without medical advice for people who are pregnant, diabetic, on medication, or with a history of disordered eating.
Evidence
- Cioffi I, Evangelista A, Ponzo V, et al. Intermittent versus continuous energy restriction on weight loss and cardiometabolic outcomes: a systematic review and meta-analysis of randomized controlled trials. J Transl Med. 2018;16(1):371.