🥗 Diet
intermittent fasting
Alternating eating and fasting windows. Causes weight loss versus unrestricted eating, but NOT beyond matched calorie restriction — the benefit is the calorie deficit, not the timing itself.
5 well-supported · 1 disputed. This shows how settled each sub-question is, not whether intermittent fasting is "good." Direction lives in each claim below.
The 9 claims about intermittent fasting
Each keeps its own verdict — we never average them away.
Is 5:2-style intermittent fasting as good as everyday calorie-cutting for HbA1c and weight in type 2 diabetes?
Strong support Yes — head-to-head randomized non-inferiority trials show 5:2/intermittent energy restriction matches daily calorie restriction for HbA1c and weight loss, so it is a reasonable equivalent option, not a superior one.
Does intermittent fasting help you lose weight?
Strong support Yes, but the benefit comes mostly from eating fewer calories, not the timing itself.
intermittent fasting decreases insulin resistance
Strong support 🔎 Limited evidence
Does intermittent fasting actually switch on autophagy (cellular self-cleaning) in humans, not just in mice?
Leans support Weakly supported in humans now — autophagy induction is robust in animal models, and two small fasting-mimicking-diet RCTs recently measured increased autophagy markers/flux in people, nudging this off 'refuted' — but the human evidence is still thin, mostly FMD-based, and one controlled study found no activation in skeletal muscle, so it is far from established.
Does intermittent fasting lower blood pressure?
Leans support Yes modestly — pooled RCTs show roughly a 4-6 mmHg systolic reduction, but much of it parallels weight loss and effects on diastolic pressure are smaller and less consistent.
Does intermittent fasting lower inflammation markers like CRP and IL-6?
Contested Partly — pooled trials show a small but real drop in CRP, while IL-6 and TNF-alpha changes are inconsistent and much of the effect tracks weight loss rather than fasting per se.
Does fasting beat plain calorie-cutting for weight loss?
Contested No clear advantage — when calories are matched, fasting adds no extra weight loss beyond simply eating less; trials split.
Does alternate-day / 5:2 fasting improve insulin sensitivity more than plain calorie-cutting at the same weight loss?
Contested Mixed — one intermittent-energy-restriction RCT showed greater HOMA-IR improvement than daily restriction, but the largest year-long alternate-day-fasting trial found no insulin-sensitivity advantage, so a weight-independent effect is not established.
Does fasting every other day raise bad cholesterol?
Refuted No — most trials show no rise versus ordinary calorie cutting, with only one outlier suggesting harm.
Educational only, not medical advice. Hub descriptions are curated for honesty; see the methodology.