Meal timing and circadian biology: when you eat matters for how long you live

Beyond what you eat, when you eat also has a big impact on your metabolic health and ageing. Your body runs on a 24-hour internal clock that controls hormone release, digestion and cellular repair. Aligning your eating patterns with this natural rhythm is one of the most accessible longevity strategies.

Did you know?

When you eat can matter as much as what you eat for long-term health.

Your body processes food most efficiently during daylight hours, when insulin sensitivity and digestion are at their peak. Eating late at night disrupts these processes and speeds up metabolic ageing.

Time-restricted eating

(keeping food intake within a consistent daily window) improves insulin sensitivity, reduces inflammation and supports autophagy- your body's natural cleanup process for damaged cells.

Circadian alignment

Eating in sync with your body clock optimises hormone function, improves sleep and reduces the metabolic stress that speeds up ageing.

Simple timing strategies for longevity

Maintain a consistent 12-hour eating window most days (for example, 7 am to 7 pm) to allow adequate time for overnight repair processes.

Front-load your calories: eat larger meals earlier in the day when your insulin sensitivity and digestive capacity are at their peak.

Include protein at each meal to support muscle maintenance throughout your eating window.

Avoid constant grazing: aim for satisfying meals with intentional gaps between them to allow insulin to return to baseline and cellular cleanup to occur.

Finish eating at least two to three hours before sleep to support overnight repair and growth hormone release.

Who should be cautious with fasting patterns?

If you are under 18, pregnant or breastfeeding, have a history of an eating disorder, are underweight, or taking insulin or certain diabetes medicines, you should seek personalised advice before modifying your eating windows.