Working nights might affect your health differently depending on things like your gender, when you naturally feel awake or sleepy, or how much money you make — but this study didn’t check any of those things, so we can’t fully explain why other studies have found different results.

People who work nights don’t seem to have worse health markers like weight, blood pressure, or blood sugar compared to similar people who only work days—so night shifts probably don’t mess up your metabolism, heart, or immune system in this group of Germans.

People who used to work nights don’t seem to have more health problems like diabetes or heart disease risks later on than people who never worked nights—even when you account for their age and medicines they take.

Women who work nights might have lower levels of the 'good' cholesterol than women who work during the day, but this doesn’t seem to happen in men—so night shifts might affect women’s cholesterol differently.

People who naturally stay up late might be more likely to develop a fatty liver if they work night shifts or irregular hours, because their body clock doesn’t match their work schedule.