Do not expect breakfast or a 16:8 eating window to solve weight control; choose a sustainable schedule
The claim that skipping breakfast inevitably causes overeating later was not supported by the trials: breakfast skippers ate over 200 fewer kilocalories daily and weighed slightly less. Over a year, adding time-restricted eating to calorie restriction did not clearly improve weight loss. Habitual breakfast skipping is associated with about 17% more cardiovascular disease, but the cited long-term study did not establish a difference in overall mortality.
What it takes
Nothing. You save the mental effort of arguing with the clock every day.
What you may gain
A meta-analysis of 13 randomized trials found that participants assigned to eat breakfast consumed 259.79 kcal more per day than breakfast skippers (95% CI 78.87–440.71) and weighed 0.44 kg more (0.07–0.82). Skippers did not fully compensate at lunch and dinner. Follow-up was short: about seven weeks for weight and two weeks for energy intake. For time-restricted eating, a 12-week trial in 116 adults with overweight compared a noon-to-8 p.m. eating window with three regular meals. The weight difference was −0.26 kg (−1.30 to 0.78), not statistically significant. A Guangzhou trial in 139 people with obesity followed participants for 12 months. Adding a restricted eating window to calorie restriction produced 1.8 kg more weight loss (difference −1.8 kg; −4.0 to 0.4), also not significant. For long-term associations, pooled observational data covering 2.38 million people linked breakfast skipping with cardiovascular disease, OR 1.17 (1.09–1.26), and cardiovascular mortality, OR 1.49 (1.20–1.84). These were observational studies, not randomized comparisons. In the original study with 17–23 years of follow-up, all-cause mortality had an HR of 1.19 (0.99–1.42); the interval included 1 and did not establish a difference.
Context & considerations
The 17% cardiovascular association comes from observational studies. Breakfast skippers are also more likely to smoke, drink, sit for long periods, and have lower incomes; adjustment cannot necessarily remove all those differences. How much, if any, is caused by breakfast itself remains unclear, and the all-cause mortality interval included 1. Evidence on 16:8 is also mixed: a review of 30 trials involving 1,341 people found 1.46 kg more weight loss with time restriction at equal calorie intake (−2.65 to −0.26), alongside 0.41 kg more lean-mass loss. Most trials were short; the longest, rigorous 12-month trial found no clear difference. Prolonged fasting may also relate to gallstones. A cross-sectional survey of 6,547 people found about 5% higher odds of gallstones per hour later for the first meal, OR 1.05 (1.02–1.08). Eating the first meal between 9 a.m. and 2 p.m. rather than earlier was associated with OR 1.49 (1.24–1.77). Longer bile retention is a proposed mechanism, but gallbladder problems may themselves have changed eating habits. China’s Kailuan cohort recorded 369 gastrointestinal cancers over 5.6 years. Breakfast skipping was associated with colorectal cancer risk of 2.32 (1.34–4.01) and gallbladder or extrahepatic bile-duct cancer risk of 5.43 (1.34–21.93). The latter interval is extremely wide because there were few events; it is a research lead, not a firm estimate. Meal timing appears to have a small effect on weight. Long-term breakfast-skipping associations lean unfavorable but do not prove causation; eating a normal breakfast is a reasonable cautious choice without expecting it to cause weight loss. H. pylori and long-term painkiller use are major causes of gastritis and ulcers, rather than fasting itself; see H. pylori testing and treatment. For incidentally found symptom-free gallstones, see avoiding unnecessary preventive surgery. For weight control, focus on what and how much you eat: five daily servings of fruit and vegetables, less ultra-processed food, and a BMI of 20–25. People with diabetes, people using glucose-lowering medicines, and pregnant people need individual advice; missed meals may cause hypoglycemia. Extreme restriction, prolonged fasting, and purging are separate concerns; see avoiding dangerous weight-control methods.
Research & references
Sievert K, Hussain SM, Page MJ, et al. (2019). Effect of breakfast on weight and energy intake: systematic review and meta-analysis of randomised controlled trials. BMJ. https://doi.org/10.1136/bmj.l42; Lowe DA, Wu N, Rohdin-Bibby L, et al. (2020). Effects of Time-Restricted Eating on Weight Loss and Other Metabolic Parameters in Women and Men With Overweight and Obesity. JAMA Internal Medicine. https://doi.org/10.1001/jamainternmed.2020.4153; Liu D, Huang Y, Huang C, et al. (2022). Calorie Restriction with or without Time-Restricted Eating in Weight Loss. New England Journal of Medicine. https://doi.org/10.1056/NEJMoa2114833; Zhang H, Zhang S, Liu Y, et al. (2025). The association between skipping breakfast and cardiovascular disease: a meta analysis. Frontiers in Cardiovascular Medicine. https://doi.org/10.3389/fcvm.2025.1565806; Rong S, Snetselaar LG, Xu G, et al. (2019). Association of Skipping Breakfast With Cardiovascular and All-Cause Mortality. Journal of the American College of Cardiology. https://doi.org/10.1016/j.jacc.2019.01.065; Fernandes-Alves D, Teixeira GP, Guimarães KC, Crispim CA (2026). Systematic Review and Meta-analysis of Randomized Clinical Trials Comparing Time-Restricted Eating With and Without Caloric Restriction for Weight Loss. Nutrition Reviews. https://doi.org/10.1093/nutrit/nuaf053; Sun T, Zhang L, Lu Y, et al. (2024). Non-linear relationship between the first meal time of the day and gallstone incidence in American adults. Frontiers in Nutrition. https://doi.org/10.3389/fnut.2024.1521707; Liu T, Wang Y, Wang X, et al. (2023). Habitually Skipping Breakfast Is Associated with the Risk of Gastrointestinal Cancers: Evidence from the Kailuan Cohort Study. Journal of General Internal Medicine. https://doi.org/10.1007/s11606-023-08094-7.