Don’t count on breakfast or 16:8 intermittent fasting to control weight; pick meal times you can stick with long term

The popular claim is that skipping breakfast makes people binge at lunch and dinner so the day’s total is higher. Trials are not like that: people who skipped breakfast ate a bit over 200 kcal less in a day and weighed a little less. 16:8 versus simply eating less: body weight after a year also did not differ. People who skip breakfast long term have about 17% more cardiovascular disease, but that is only an association; all-cause death shows no difference.

Cost

No money. What you save is the daily mental effort of wrestling meal times.

Benefit

First the claim “skipping breakfast makes people eat more later.” A meta-analysis pooled 13 randomized trials. People assigned to eat breakfast took in 259.79 kcal more per day than those who skipped (95% CI 78.87–440.71, the credible range). Weight was 0.44 kg higher (0.07–0.82). Skippers did not make it up at lunch and dinner. Follow-up in these trials was short: mean 7 weeks for weight, mean 2 weeks for intake. Next, 16:8 and similar eating only in fixed hours. One trial put 116 overweight adults on it for 12 weeks. Eating only from noon to 8 p.m. versus three regular meals: weight differed by −0.26 kg (−1.30 to 0.78), not significant. Another in Guangzhou, 139 people with obesity, followed 12 months. Time-restricted eating plus calorie control lost 1.8 kg more than calorie control alone (−4.0 to 0.4), also not significant. Finally, whether long-term breakfast skipping harms. In a pool of 2.38 million people, skippers had about 17% higher cardiovascular-disease risk (OR 1.17, 1.09–1.26) and about 49% higher cardiovascular death (OR 1.49, 1.20–1.84). But these are record-only, non-randomized studies. In the original study followed 17 to 23 years, the all-cause-death hazard ratio was 1.19, credible range 0.99 to 1.42, crossing 1 — not a difference.

Notes

Controversy. That 17% for cardiovascular disease comes from record-only, non-randomized studies. Breakfast skippers are already more likely to smoke, drink, sit long, and earn less; those factors cannot be cleaned up fully. So how much of the 17% is breakfast itself is unclear. The all-cause-death result already crosses 1. 16:8 is also disputed. One pool of 30 trials and 1341 people, with both arms eating the same amount, found time-restricted eating lost 1.46 kg more (−2.65 to −0.26). The cost was 0.41 kg more lean mass lost. But most of those trials were short; the longest, strictest twelve-month trial said no difference. Long fasting also links to the gallbladder. In a cross-sectional survey of 6547 people, each hour later the first meal of the day, gallstones found rose about 5% (OR 1.05, 1.02–1.08); first meal between 9:00 and 14:00 versus earlier was about 49% higher (OR 1.49, 1.24–1.77). The mechanism is that the longer bile sits in the gallbladder, the more easily stones form. But this is a same-time survey; gallbladder problems may have changed meal habits first. China’s Kailuan cohort followed 5.6 years and recorded 369 digestive-tract cancers. Breakfast skippers had 2.32 times the colorectal-cancer risk (1.34–4.01) and 5.43 times gallbladder and extrahepatic bile-duct cancer (1.34–21.93). The latter’s credible range reaches 21.93 — too few events; treat as a lead only. Altogether, for weight control, meal timing’s effect is small; don’t spend mental effort on it. Whether long-term total breakfast skipping is good: existing evidence is all association, not proof of cause, but the direction leans unfavorable. To be safe, eat normally; just don’t expect it to help you lose weight. An NIDDK public page states the most common causes of stomach ulcers are Helicobacter pylori and painkillers such as aspirin and ibuprofen; fasting is not among the rarer causes listed. What to check: Section 1, Item 23 (test for H. pylori; if positive, eradicate). Gallstones found on check-up that never hurt: Item 20 in this section. To control weight, what has evidence is what and how much you eat — Section 2, Item 27 (5 servings of fruit and vegetables a day), Item 28 (less ultra-processed food), and Item 32 (keep BMI 20–25). People with diabetes, on glucose-lowering drugs, or pregnant are exceptions; missing a meal may mean low blood sugar — follow medical advice. Extreme fasting and purging are separate — Section 28, Item 1 (don’t use extreme dieting, fasting, or purging to control weight).

Sources · 9

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9. National Institute of Diabetes and Digestive and Kidney Diseases (2022). Symptoms & Causes of Peptic Ulcers (Stomach or Duodenal Ulcers)（「The most common causes of peptic ulcers are Helicobacter pylori (H. pylori) infection and nonsteroidal anti-inflammatory drugs (NSAIDs).」）. niddk.nih.gov/health-information/digestive-di…