Chrononutiriton – in a nutshell

  • The idea is to optimize nutrition, absorption of nutrients, and excretion of waste, based on an overlooked daily cycle.
  • After you wake up, you have an “acid wave” and a more active metabolism (digestion).
  • To adapt to this acid wave, it is better to eat acid-formng foods, most of all protein, such as eggs, fish, or meat, at the begining of your day (breakfast or lucnh or both).
  • At the end of your day, you have a less active metabolism and less acidity, so it is better to eat less at the end of the day and only fruits and vegetables (alkalne-forming foods).
  • Eating a light dinner of only fruits and vegetables at least two to four hours before you sleep can also act as a gentle sedative.
  • The natural sugar in the furit can increase your blood sugar and after two hours or so make you feel less energy, after you absorb the natural sugar from your blood into your tissues.
  • Reference is Drs. Delabos MD and Andrew Weil MD.

Chrononutrition – briefly

One of the first advocates of chrononutrition was Dr. Frank Halberg, MD, who lived to the age of ninety-four. He showed that “when” we eat can make the difference between life and death in the experimental laboratory, and between weight gain or weight loss in everyday life.

Chrononutrition is the idea that metabolism, the digestive system, is more active at the beginning of the day.  Related to this is that you burn more energy at the beginning of the day than at the end, further discounting the “calorie theory“.

In the morning, you may have an “acid wave” after sleeping and waking up. For example, the first urine of the day is usually acidic. In the evening, you may tend to be more alkaline. To absorb and assimilate the nutrients in your food, it is better to adapt to this daily cycle, at least according to this idea.


omeletAdapting to this daily cycle means eating relatively more food and more acid-forming foods, such as protein and nuts, for breakfast and lunch, and eating less food and more alkaline-forming foods, such as vegetables and fruits, for dinner. Recently, Dr. Alain Delabos, a French doctor, promoted this idea in 1986. The goal is to optimize digestion. In some circles, this idea has become popular in France, but is little known outside of France. This assumes that you eat three meals a day, wake up in the morning, work or are active during the day, and sleep at night.

Chrononutrition is similar but more detailed than the ancient advice to “eat like a king or queen for breakfast, like a prince for lunch, and like a pauper for dinner“.

There are various interpretations of this idea. As I interpret it, the guidelines of chrononutrition are consistent with food combining. 

  • For breakfast, always eat some protein, such as beef, turkey, fish, or eggs, or else vegan protein, such as tofu, lentils, or quinoa. Protein is acid-forming.

  • For lunch, also eat some protein, such as beef, turkey, fish, or eggs, or else vegan protein, depending on your preference and taste.

  • For dinner, eat only vegetables or fruit, which are alkaline-forming. Never eat protein with dinner.

After waking up in the morning, most people are slightly more acidic. Do you ever hear your bones make that slightly cracking sound in the morning? This may indicate pockets of acidity in your bones and tissues.

Besides adapting to the “acid wave” in the morning, another possible reason always to eat protein in the morning is that protein feeds your muscles. You need your muscles to move around during the day, even if you work in an office. You break down protein to amino acids, which you then assemble to make new muscle and bone. There is a delay in this process, but if you eat protein in the morning, you then have more amino acids available to your muscles during the day.

At night, after dinner, you tend to move around less, so you do not use your muscles much. Also, vegetables, fruits, or starch (carbohydrates) becomes sugar in your blood much more quickly than protein. After an increase in blood glucose, you secrete insulin to absorb the sugar from your blood into your tissues. This process can make you drowsy, which is what you want to be before you go to sleep.

You can also notice this effect in the morning. Many people find that if they eat breakfast with orange juice and a croissant, bread, or cereal, then about two hours later in the office they become drowsy and look for their morning coffee to keep them alert or at least awake. This is because the orange juice and bread or cereal quickly increase your blood sugar. This “sugar high” then provokes a secretion of insulin by your pancreas. The insulin lowers the glucose in your blood, leaving you feeling tired or drowsy two to three hours after such a breakfast.

Chrono-nutrition works for many people, but not for everybody. It works for me, but the fact that it works for me does not mean that it will work for you. Do your own research. It costs you nothing to try it for yourself and see. This idea and method are widely promoted in France in the form of popular online videos.

Dr. John Whitcomb does not acknowledge Dr. Delabos, but he interprets chrononutrition in his four-minute video here. Chrono-nutrition is related to the idea of chronobiology, which has wider significance than planning your meals. Besides your digestion, your internal clock can affect your optimal sleep.

There is some research, to be cited, that there is a daily, natural, healthy cycle of secretions from your brain, also known as neurotransmitters. Serotonin is a neurotransmitter for brain cells and other nervous system cells to communicate with one another. Tryptophan is a precursor to serotonin. Excellent sources of trytophan (more than 3.0 µg/g) include walnuts, plums, bananas, pineapple, pecans, kiwi fruit, plantains, and tomatoes.  Tryptophan is also found in turkey, salmon, red meat, pumpkin seeds, oatmeal, tofu, beans, and eggs. Serotonin is said to calm the mind and be restful.

Dopamine is another neurotransmitter that is associated with alertness and mental energy.


Chrono-nutrition: a review of current evidence, Proceedings of the Nutrition Society, 2015
The Big Breakfast Study: chrono‐nutrition influence on energy expenditure and bodyweight, Wiley Nutrition Bulletin, 2018
La chrononutrition – French-language site by Dr. Delabos

Delabos MD, Dr. Alain, “Docteur Delabos – la chrononutrition“, 1:02 video (in French)
Delabos MD, Dr. Alain, “La chrononutrition, Mai 2021“, 1:11 video
Breus PhD, Michael – “the sleep doctor”, author, “The Power of When”, links, Los Angeles, California
What is Chronobiotic Nutrition?“, Marcella vonn Harting, article
vonn Harting, Marcella , “Yes, No, Maybe: Chronobiotic Nutrition“, Warm Snow, 2004, summary
Weil MD, Dr. Andrew, “Do You Eat Right Before You Sleep? 2 Reasons To Break That Habit“, article
Why eating at night is bad for your health: the consequences explained“, JJ Virgin, article

Simons, Doug, and Wildcraft, Marjory, “The Kidney Wrap: Prepare Your Body For Winter“, :05 video
Lennon, Danny, “Circadian Eating – Chrono-nutrition“, :57 video
When Is the Best Time to Take Vitamins?“, Natural Cures, :08 video

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