Diabetes and stroke: why you should definitely eat breakfast before this time in the morning
Setting an alarm a little earlier to have time to eat in the morning may seem trivial. However, this micro gesture would have a strong impact on blood sugar, heart and even weight, according to researchers. A dietitian confirms that the body is programmed to receive fuel early in the morning.
French work (NutriNet-Santé cohort), and research published in the journal Nutrients in 2023, all converge on the same idea: not delaying too much for your first meal would be beneficial. And a “deadline” clearly emerges for optimal health.
Circadian rhythm: why your body prefers a very early breakfast
Our body follows a circadian rhythm, a sort of internal clock that regulates hormones, digestion and energy production. At the start of the morning, insulin sensitivity is at its highest: the body manages carbohydrates better, stores less fat and blood sugar levels remain more stable. This is the principle of chrononutrition, which focuses on “when” as much as “what”.
An American dietician explains that, from a metabolic point of view, eating breakfast before 8:30 a.m. is the most favorable option. The data published in Nutrients go in this direction: people who eat before 8:30 a.m. have a healthier metabolic profile. Many teams also recommend an overnight fast of around 12 hours, such as dinner at 7:30 p.m. and breakfast around 7:30 a.m.
Diabetes, stroke, heart attack: before what time should you eat in the morning to limit these risks?
The large French NutriNet-Santé study, involving around 103,000 adults, shows that eating breakfast after 9 a.m. increases the risk of type 2 diabetes by 59% compared to eating breakfast before 8 a.m. Researchers from INRAE and Inserm have also observed that for each hour of delay in the first meal, the risk of cardiovascular disease increases by around 6%, especially in women.
Among those over 60, regularly delaying the first meal well beyond the usual time, around 8 a.m., is associated with an increased risk of mortality. Other work links late or skipped breakfast to more visceral fat and fatty liver, two unfavorable markers for the heart. Certain intermittent fasting schemes with a very late eating window even show an increased risk of cardiovascular death which can be close to +91%.
The simple rule to adopt every morning, even if you are not hungry
In summary, the dietitian advises aiming for breakfast within two hours of waking up, ideally between 7 a.m. and 8 a.m., in any case before 8:30 a.m., and avoiding going beyond 9 a.m. as much as possible. A fairly regular time from day to day also helps weight loss by stabilizing hunger signals. Those who practice intermittent fasting may benefit from setting their eating window early, such as 8 a.m.–4 p.m., rather than starting at noon.
If you are not hungry, the idea is to lighten and bring forward dinner, then introduce a little something in the morning: a modest meal is enough to send the right metabolic signal. Here are just a few quick options:
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Plain Greek yogurt with fruit and some nuts;
- an egg, a slice of wholemeal bread and a little avocado;
- a small protein milk smoothie (animal or vegetable) with flax seeds.
Little by little, this first morning meal will turn into a reflex, discreet but precious for your health.