Your body, guided by its circadian rhythm, is better prepared to digest food and regulate blood sugar during daylight hours. Common wisdom tells us to make breakfast our largest meal of the day because daytime is when we need the energy we get from food. A late dinner, on the other hand, provides energy that signals to your body that you’re trying to stay awake, which is self-defeating when you’re getting ready for bed.
Eating a large meal too close to bedtime also means your body will be digesting while you’re trying to sleep, which makes it harder to get quality sleep. You especially want to steer clear of late night spicy or fatty foods, which can cause acid reflux, another sleep disrupter. Allowing at least three to four hours to digest a large meal before going to bed will help your body sail through its natural processes.
When we’re not sleeping well, we also tend to crave foods high in saturated fat late at night (think pizza and chicken wings!). That tendency stems from the effect poor sleep has on our metabolism. So not only are we feeling hungrier from a lack of sleep, we’re craving foods higher in calories at a time when we’re sedentary and not able to use this energy from food — a recipe for increased body fat and even obesity.
Staying up late also presents more opportunities to eat and fall victim to fatty foods. The healthier approach — from the perspective of your metabolism and your sleep -— is to go to bed at a reasonable hour to get your full seven to nine hours of sleep.
Sources: Sleep Foundation; Prevention; Bandín, C, et al. (2015) Meal timing affects glucose tolerance, substrate oxidation and circadian-related variables, Int J Obes; Beccuti, G, et al. (2017) Timing of food intake: Sounding the alarm about metabolic impairments? A systematic review, Pharmacological Research; Spaeth, A, et al. (2013) Effects of Experimental Sleep Restriction on Weight Gain, Caloric Intake, and Meal Timing in Healthy Adults, SLEEP; Wehrens, S, et al. (2017) Meal Timing Regulates the Human Circadian System, Curr Biol.
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