Weight Gain Isn’t Just About What You Eat
What you eat matters, but it's not the whole story
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Weight Gain Isn’t Just About What You Eat
Think of your metabolism like a store with business hours.
During the day, the lights are on, the staff is ready, and your body handles incoming fuel more efficiently. Late at night, the store is still open, but running on a skeleton crew.
That means the same food may be handled differently depending on when you eat it, not just how much you eat.
What the Data Shows
In a tightly controlled randomized crossover trial, researchers compared the same people eating the same calories on an early versus late schedule. Late eating increased hunger, shifted appetite hormones in a direction that can promote eating, lowered waking energy expenditure, and changed fat tissue biology in a way that may favor fat storage.1
A 2024 systematic review and meta-analysis in JAMA Network Open found that meal-timing strategies were associated with small improvements in body weight, BMI, and waist circumference over at least 12 weeks, with earlier eating patterns generally looking more favorable than later ones.2
And in a 2024 prospective cohort study of 9,474 adults, midnight snacking was associated with a higher risk of developing obesity over time.3
This does not mean that eating after 7 PM automatically causes weight gain, but late-night eating can make weight control harder because your biology is usually less prepared to deal with food late in the day.
You can read the full deep dive here:
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To your zenith within,
Sara Redondo, MD, MS
References:
Vujović N, Piron MJ, Qian J, Chellappa SL, Nedeltcheva A, Barr D, et al. Late isocaloric eating increases hunger, decreases energy expenditure, and modifies metabolic pathways in adults with overweight and obesity. Cell Metab. 2022;34(10):1486-1498.e7. doi:10.1016/j.cmet.2022.09.007.
Liu HY, Eso AA, Cook N, O’Neill HM, Albarqouni L. Meal timing and anthropometric and metabolic outcomes: a systematic review and meta-analysis. JAMA Netw Open. 2024;7(11):e2442163. doi:10.1001/jamanetworkopen.2024.42163.
Lyu J, Lee HJ, Jung S, Park Y. Associations of meal timing and sleep duration with incidence of obesity: a prospective cohort study. J Nutr Health Aging. 2024;28(5):100220. doi:10.1016/j.jnha.2024.100220.