Teenagers who stay up late eat more and move less - study

It's not just about the amount of sleep, but also about exactly when your teen sleeps.

Details

The study found that teens with late bedtimes are more likely to consume more calories, especially carbohydrates.

They are also more likely to snack more often, especially in the evening and at night, and less likely to eat breakfast because they wake up later.

As a result, their diets become less balanced compared to those who follow an earlier regimen.

They are also more likely to be sedentary and engage in less physical activity.

Scientists note that an important role is played by the internal biological rhythm, which affects not only sleep, but also hunger and energy levels.

Interestingly, the relationship between sleep, nutrition and activity was stronger during the academic period than during the holidays.

However, the authors emphasise that the study shows a link rather than a direct cause.

Why it matters

Sleep disruption can affect several health-related factors at once.

The researchers recommend:

• adhere to a more consistent sleep schedule
• try to go to bed and get up at the same time
• avoid late-night snacking
• pay attention to physical activity

These habits may help reduce future health risks.

Background

Teens often go to bed later due to changes in biological rhythms at this age, but school schedules require early rising.

On average, it is recommended that teens get 8-10 hours of sleep, but many do not reach this norm.

Source

The study is based on data from 373 adolescents and young adults (12-23 years old) who were analysed for sleep patterns, nutrition and physical activity using wearable devices and surveys. It was published in Sleep Health (2026).