Chrononutrition
Nutritional approach that synchronizes food intake with circadian biological rhythms, adapting the nature and quantity of foods to the enzymatic and hormonal secretions of each time of day.
Nutritional approach that synchronizes food intake with circadian biological rhythms, adapting the nature and quantity of foods to the enzymatic and hormonal secretions of each time of day.
Presentation
Chrononutrition is a nutritional method conceptualized by Dr. Alain Delabos in 1986, in collaboration with Prof. Jean-Robert Rapin. It rests on the principle that nutrition effectiveness depends not only on what we eat but also when we eat it. Enzymatic and hormonal secretions follow a precise circadian rhythm that conditions the body's ability to metabolize different macronutrients.
Chronobiological Principles
In the morning, cortisol peaks (7-8 AM), stimulating gluconeogenesis and lipolysis. Lipases and proteases are active — optimal time for saturated fats and proteins. Midday, insulin and amylases reach maximum — time for proteins and complex carbohydrates. Afternoon (4-5 PM), a physiological insulin peak justifies a sweet snack. Evening, digestive secretions decrease significantly — meals should be light and low-calorie.
Typical Protocol
- Breakfast (7-8 AM): fatty meal — aged cheese, whole grain bread, butter, unsweetened hot drink
- Lunch (12-1 PM): dense meal — animal or plant proteins, whole grain starches, green vegetables
- Snack (4-5 PM): natural sweet — dark chocolate 70% or fresh fruits or nuts
- Dinner (7-8 PM): light meal — lean fish or seafood, cooked or raw vegetables
Scientific Basis
Nutritional chronobiology is an expanding research field. Studies confirm that the same calories consumed morning or evening have different metabolic impacts. Garaulet et al. (2013) showed late lunchers lost significantly less weight. Research on time-restricted feeding confirms benefits of food synchronization on weight, blood sugar and inflammatory markers.
Medical Disclaimer
The information presented in this article is provided for educational and informational purposes only. It does not constitute medical advice, diagnosis, or treatment prescription. If in doubt, always consult your physician or a qualified healthcare professional. The techniques described do not replace conventional medical treatment.