A growing field called chrononutrition suggests healthy eating depends not just on food choices but on timing also guided by the body's internal clock or circadian rhythm.
Researcher from the University of Murcia first noticed this after observing two dieting patients with identical meals but different results the one eating lunch earlier lost more weight. A follow-up study of 420 adults confirmed that earlier lunches led to faster with greater weight loss.
Experts say our bodies process food differently depending on the time of day. Eating close to bedtime when melatonin rises can impair blood sugar control and reduce insulin production also increasing long-term diabetes risk. Late eating has also been linked to reduced feelings of fullness also increased fat storage and in a large French study higher cardiovascular risk.
People's natural "chronotype," whether they're early risers or night owls, also affects meal timing and how their bodies respond to food. Morning types tend to have better insulin sensitivity while evening types face higher risks of poor glucose control and weight gain.
Sleep quality plays a role too poor sleep increases cravings for energy-dense foods researchers note.
Nutritionists recommend eating fibre-rich carbohydrates like whole grains, legumes and fruit earlier in the day and choosing lighter, protein-rich meals in the evening, ideally including sleep-supporting foods like nuts, seeds and tryptophan-rich proteins such as chicken or fish.
Experts suggest the healthiest habit is to eat the largest meal earlier in the day and finish dinner at least three hours before bedtime.
