Sleep Deprivation and Its Impact on Your Food Intake

Feeling tired and hungry often go hand in hand—and science may explain why. After a poor night’s sleep, you might reach for extra snacks or eat larger meals, since low energy can make hunger feel more intense.

Emerging research shows that sleep deprivation doesn’t just affect how you feel—it can also influence how much you eat. In fact, studies suggest that consistently getting too little sleep may contribute to overeating and increase the risk of obesity.

Study 1: Sleep Deprivation Increases Food Intake in Healthy Men

It is known that short-term sleep deprivation increases plasma concentrations of ghrelin (a hormone related to increased appetite) and decreases concentrations of leptin (a hormone related to satiety). In a randomized crossover study, researchers studied twelve normally healthy non-obese men to observe the effect of sleep deprivation on energy intake and physical activity.

During the first night of each 48-hour session, subjects had either 8 hours (from midnight to 8:00 am) or 4 hours (from 02:00 am to 06:00 am) of sleep. All foods consumed thereafter (jam on buttered toast for breakfast, buffet for lunch, and a free menu for dinner) were eaten ad libitum (with no restrictions). Physical activity was also recorded. Sensations of hunger, perceived pleasantness of the foods, desire to eat some foods, and sleepiness were also evaluated.

In comparison with the 8-hour sleep session, subjects consumed 559 (22%) more calories on the day after sleep restriction, and hunger was higher before breakfast and dinner. Researchers observed no change in the perceived pleasantness of the foods or in the desire to eat the foods. Physical activity was slightly higher after sleep restriction than after 8 hours of sleep, even though the sensation of sleepiness was more apparent.

In this group of healthy men, one night of reduced sleep led to an increase in food intake and, to a lesser extent, physical activity-related energy expenditure. Although further research is needed to confirm the results of this small study, these results suggest that sleep restriction could be a factor that promotes obesity.

Study 2: Sleep Deprivation May Lead to Overeating

Obesity is a growing problem in many countries around the world. It has been hypothesized that sleep duration plays a role in calorie consumption and a number of studies have looked at this relationship over the years. There is now a meta-analysis combining this data to come up with a clearer picture. The meta-analysis is published in the European Journal of Clinical Nutrition, and combines the results of 11 studies to analyze the result of sleep restriction on energy intake and energy expenditure.

The 11 studies contained the results of 172 individuals. Analysis reveals that partial sleep deprivation resulted in a daily average of 385 more consumed calories (p<0.00001). The increase in calories was accompanied by a significant decrease in protein intake and higher fat intake. There was no significant impact on energy expenditure. If long-term sleep deprivation continues to result in extra calorie consumption, increased weight gain is an obvious risk. However, more long-term research is needed to determine the real risk that sleep deprivation contributes to the likelihood of obesity. Alternately, research also needs to be done to determine whether extra sleep could attenuate calorie consumption and play a role in obesity prevention.

The Link Between Health, Sleep, and Diet

While we all strive for restful sleep and balanced nutrition, life doesn’t always accommodate. Stress, health challenges, and daily demands can disrupt sleep and lead to increased food intake. Although not everything is within your control, being mindful of your sleep habits and eating patterns is a powerful step toward better health. Small, intentional changes can help you identify areas for improvement—and ultimately support your overall well-being.