Proof Engine Verification (PARTIALLY VERIFIED): Eating the same calories late at night leads to significantly more weight gain and fat storage than earlier in the day.

Automated fact-verification of the claim: "Eating the same calories late at night leads to significantly more weight gain and fat storage than earlier in the day." Verdict: PARTIALLY VERIFIED Key Findings SC1 — Fat storage effects: ESTABLISHED. Three independently verified peer-reviewed sources confirm that eating the same total calories later in the day measurably increases fat storage and reduces fat oxidation compared to earlier eating. A randomized controlled trial (Gu et al. 2020) showed late dinner reduced dietary fat oxidation by ~10 percentage points (74.5% vs 84.5%, P=.02). A controlled observational study (McHill et al. 2017) found circadian food timing predicts body fat independent of total calories and activity. A second RCT (Vujovic et al. 2022, via Harvard Gazette) found late eating shifts adipose tissue gene expression toward fat accumulation and away from fat breakdown. SC2 — Clinically significant weight gain: NOT ESTABLISHED. The best available synthesis of evidence — a 2024 JAMA Network Open meta-analysis of 29 RCTs (2,485 participants) — found that earlier calorie distribution produced only ~1.75 kg more weight loss than later eating, an effect the study authors explicitly described as "small and of uncertain clinical importance" and "not clinically significant (<5%)." Only 1 of 3 required independent sources confirmed this component of the claim. Counter-evidence is substantial. A 4-week gold-standard RCT using doubly-labeled water (Ruddick-Collins et al. 2022) found no difference in total daily energy expenditure between morning-loaded and evening-loaded calorie groups. The TREAT trial (Lowe et al. 2020, n=116) found no significant between-group weight difference for time-restricted vs unrestricted eating (P=0.63). The fat metabolism effects are real but not yet bridged to clinically significant weight outcomes. SC1's fat oxidation and gene-expression changes are biologically plausible intermediaries; study authors describe them with hedged language ("may contribute to obesity if chronic"). No RCT has demonstrated that these short-term metabolic changes produce clinically meaningful weight gain under strictly identical calorie conditions over months. Files proof.py — Re-runnable Python verification script proof.md — Structured proof report proof_audit.md — Full verification audit trail proof_narrative.md — Plain-language summary proof.json — Machine-readable structured data Generated by Proof Engine v1.3.1.