“Don’t skip breakfast”: how many times have I heard or read this recommendation? For decades, this first meal of the day has been touted as the essential pillar of good health. But is this really what scientific research confirms? Recent studies considerably nuance this message, and the answer is much more complex, and more interesting, than a simple yes or no. Let's take stock together.
1. Where does this myth of the essential breakfast come from?
The idea that breakfast is "the most important meal of the day" has its origins in part in marketing campaigns from the 1940s and 1950s led by industrial cereal manufacturers, a fact documented by several nutritional historians. But science has taken hold of it, and studies have long shown a correlation between eating breakfast and better general health.
The problem ? Correlation is not causation. People who regularly eat breakfast often have other healthy lifestyle habits (physical activity, better access to a balanced diet, less stress, etc.). It is not necessarily breakfast itself that protects health.
[IMAGE 1, Healthy and balanced breakfast: whole grains, fresh fruit, eggs, coffee]
A quality breakfast is more important than its very existence.
| Question | What the science shows |
|---|---|
| Does skipping breakfast make you gain weight? | No systematically. A study published in the BMJ (2019) of 13 clinical trials did not find strong evidence that breakfast helps lose weight or prevents obesity. does it improve cognitive performance? |
| Does breakfast improve cognitive performance? | In children and adolescents, yes, the data is quite robust. In healthy adults, the effects are modest and strongly depend on the individual profile. |
| Does the timing of the meal matter? | Yes. Nutritional chronobiology shows that the body metabolizes carbohydrates better in the morning than in the evening, in connection with the internal biological clock. |
| Should you eat as soon as you wake up? | Not necessarily. If I'm not hungry when I wake up, forcing breakfast can disrupt my natural appetite regulation. |
2. What research says today
Since the 2010s, several meta-analyses and randomized clinical trials have challenged the traditional view. Here are the main conclusions to remember:
3. The key role of the circadian rhythmNutritional chronobiology is one of the most promising areas of nutrition research. My body is not indifferent to when I eat: it has an internal biological clock, the circadian rhythm, which regulates many metabolic functions.
Concretely, this means that:
- ●Insulin sensitivity is better in the morning, which promotes better processing of carbohydrates ingested at that time.
- ●Thermogenesis (heat production linked to digestion) is higher in the morning than in the evening, promoting better energy expenditure.
- ●Meals eaten too late in the evening disrupt metabolism more than the same meals eaten early in the day, according to a review published in Nutrients (2020).
In summary: it is not so much the presence or absence of breakfast that matters, but the overall distribution of my caloric intake over the day, favoring larger intakes in the morning and lightening the evening meal.
[ IMAGE 2, Illustration of the circadian rhythm / biological clock and diet ]
My body clock influences how my body processes food depending on the time of day.
4. Skipping breakfast: real or exaggerated risks?
Skipping breakfast is not necessarily harmful for everyone, but certain profiles are more at risk:
- ●People with diabetes or at risk of type 2 diabetes: a study published in Diabetologia (2015) showed that omitting breakfast was associated with greater glycemic peaks over the rest of the day.
- ●People who are overweight: skipping breakfast can cause high-calorie compensation at the end of the day.
- ●People subjected to chronic stress or long working days: hypoglycemia in the morning can increase fatigue and reduce the ability to concentrate.
On the other hand, for a healthy adult, who eats a balanced diet throughout the day and is not hungry when waking up, the absence of breakfast does not seem to constitute an established risk according to current data.
5. If I eat breakfast, how can I make it really useful?
The quality of the breakfast takes precedence over its existence. A breakfast with high nutritional value ideally consists of:
- ●A source of protein: eggs, cottage cheese, natural yogurt, legumes... for satiety and muscle recovery
- ●Complex carbohydrates with a low glycemic index: wholemeal bread, oatmeal, whole fruits… for lasting energy
- ●Good fats: a small handful of oilseeds (walnuts, almonds) or avocado for essential fatty acids
- ●To avoid: sweetened industrial cereals, pastries, industrial fruit juices, fast sugars which cause a glycemic peak followed by a drop in energy mid-morning
💡 tips to remember
- Breakfast is not obligatory: if I'm not hungry in the morning, forcing a meal has no proven benefit for a healthy adult.
- Quality takes precedence over presence: a sugary, ultra-processed breakfast is less beneficial than no breakfast.
- My biological clock has the importance: carbohydrates are better metabolized in the morning than in the evening, I can take this into account in my distribution of meals.
- If I am diabetic or at risk, eating breakfast is recommended to stabilize my blood sugar throughout the day.
- The ideal: a breakfast composed of proteins, complex carbohydrates and good fats, for stable and lasting energy until lunch.
