After lunch, the offices slow down, eyes blur, bodies demand a break. For many, this sudden fatigue is almost part of everyday life. A meal a little too rich, a short night, a stressful day: the explanations seem obvious. However, when this drowsiness systematically returns, even after balanced meals, it may mean something else. Something quieter. And deeper.
When the “bare break” becomes a warning signal
Who has never felt very tired after lunch? This sensation can remain perfectly occasional and not serious, especially after a hearty or very sweet meal. But in some people, it sets in almost every day, accompanied by a real physical and mental fog.
“A symptom that can suggest insulin resistance is when, after lunch, you feel very tired, you are very tired, you have symptoms of hypoglycemia”explains Alexandra Murcier, dietitian nutritionist, contacted by True Medical.
This drop in energy can be accompanied by other signs:
- Difficulty concentrating;
- Significant drowsiness;
- Want to sleep;
-
Palpitations;
- Hand tremors;
- Feeling unwell.
Symptoms often minimized, sometimes attributed to simple temporary fatigue. However, they can reflect an imbalance in glycemia, that is to say the sugar level in the blood.
Insulin Resistance: What’s Happening in the Body
Behind this mechanism hides an essential hormone: insulin. After a meal rich in carbohydrates or fast sugars, the pancreas secretes this hormone to allow glucose to enter the cells and supply the body with energy.
“Its role is to keep our sugar level constant,” recalls Alexandra Murcier. But this hormone also promotes fat storage.
The problem occurs when cells become less sensitive to insulin. The body must then redouble its efforts to maintain a balance.
“The pancreas must then produce increasingly larger quantities to achieve the same result: this is called insulin resistance..
In the long term, this mechanism tires the pancreas and increases the risk of prediabetes and then type 2 diabetes. It also promotes weight gain, particularly abdominal weight gain.
These foods that cause a blood sugar roller coaster
In our modern eating habits, certain meals particularly favor these sudden variations in blood sugar levels. The phenomenon is well known to specialists: the higher the glycemic load of a meal, the more quickly the blood sugar level rises… before sometimes falling just as suddenly. This is particularly the case:
- Very sweet products;
- White bread;
- Very cooked pasta;
- White rice;
- Pastries and ultra-processed products.
These foods cause a rapid rise in blood sugar, sometimes followed by a sudden drop responsible for the famous “crap” which occurs in the hours following the meal.
“The goal is really to have as little variation in blood sugar levels as possible”insists the specialist.
Eating habits that can help
The challenge is not to completely eliminate carbohydrates, but to better combine them to slow down their absorption. Alexandra Murcier recommends in particular never consuming starchy foods alone.
“You should always combine starchy foods with vegetables,” she explains. Fiber slows down the absorption of sugar and limits glycemic peaks.
The fibers contained in vegetables help slow down the absorption of glucose and limit glycemic peaks. Adding protein — eggs, fish, lean meat, tofu or legumes — also helps stabilize the meal and prolong the feeling of fullness and lowers the overall glycemic index of the meal.
Focus on good starchy foods. The full versions are preferred:
- Brown rice;
- Wholemeal pasta;
- Wholemeal bread;
- Quinoa.
Richer in fiber, they lead tos more moderate glycemic variations.
Cooking also plays an important role. “When starchy foods are cooked al dente, their glycemic index is lower”specifies Alexandra Murcier.
Walking after a meal: this discreet reflex that can make the difference
Sometimes the most effective solutions are also the most accessible. Faced with these silent metabolic imbalances, physical activity remains one of the most powerful levers.
No need for intensive sport. A walk of 15 to 20 minutes after a meal can already help the body to better use blood glucose.
“The goal is not to go and do a marathon behind, but simply to have gentle and moderate physical activity”recalls the nutritionist.
A simple habit that can help limit blood sugar spikes and bouts of fatigue following meals, while gradually improving insulin sensitivity.
When to consult?
If, despite everything, you feel tired after each meal, ask yourself the question. A one-off episode after a very rich meal is nothing to worry about. On the other hand, repeated bouts of fatigue, associated with cravings, tremors or difficulty concentrating, merit speaking to a healthcare professional.
A blood test can help assess blood sugar levels and early detect possible insulin resistance before the onset of diabetes.