Korean women who are overweight and work nights or rotating shifts are much more likely to have high insulin levels than overweight women who work regular daytime hours, which might mean their bodies have a harder time managing blood sugar.

Korean women in their 40s who work nights or irregular shifts are almost twice as likely to have high insulin resistance — a sign their body isn’t using sugar properly — compared to those who work regular daytime hours.

Women in Korea who work non-traditional hours like nights or rotating shifts are 30% more likely to have higher insulin resistance — a sign their body isn’t using sugar properly — even when you account for their weight, diet, and income, which might mean their work schedule is hurting their metabolism.

Women who work evening or night shifts in service jobs like retail or nursing are more likely to have higher insulin resistance — a sign their body isn’t using sugar properly — than women in the same jobs who work regular daytime hours.

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.