People who get less than 6 hours of shut-eye a night tend to have more body fat. Lack of sleep can cause your body to make too much of the hormones cortisol and insulin, which can add pounds.

The claim states that people who get less than six hours of sleep tend to have more body fat and that lack of sleep can cause the body to produce excess cortisol and insulin, which can contribute to weight gain. The search results include a survey from Japan indicating that many people get less than six hours of sleep, and an article discussing racial disparities in sleep duration.

However, neither source addresses the relationship between short sleep duration and body fat accumulation, nor do they discuss hormonal changes such as increased cortisol or insulin production due to lack of sleep. Without direct evidence from the provided sources, the claim cannot be verified based on this information alone. Scientific literature outside these results does support links between insufficient sleep, hormonal changes, and weight gain, but that is beyond the scope of the current data.