Night owls show poorer metabolic health despite similar diets
A study of 287 women found that those with a 'night owl' chronotype tend to have poorer metabolic health and higher body fat compared to early risers. Researchers suggest that the timing of meals, rather than total caloric intake, is a primary factor in these health differences.
Why it matters
Understanding the link between circadian rhythms and metabolic health could lead to more effective, personalized dietary interventions for weight management.
Women who are natural night owls have been found to carry more body fat and show less favorable blood sugar and cholesterol levels than women who prefer earlier schedules.
A study of nearly 300 New Zealand women found this held even though both groups ate about the same amount of food each day. What separated them was timing.
The night owls ate little in the morning and pushed their biggest meals into the late evening, and that late-night eating tracked closely with higher body fat and poorer metabolic health.
Whether someone is an early bird or a night owl comes down to chronotype , the body’s built-in preference for when to sleep, wake, and feel alert.
To classify participants, the researchers used a questionnaire that pinpoints the midpoint of a person’s sleep on work-free days.
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