Barely the last bite swallowed, some are already examining their silhouette in the mirror. The next day, the scales seemed to confirm their fears. Several kilos more, without transition. Should we be alarmed by such a leap? This familiar phenomenon, especially after the holidays, has little to do with real weight gain. Because between what we eat and what the body stores, the difference is much greater than it seems.
When gluttony becomes a social ritual
During festive periods, eating habits change. Meals stretch out, portions double, and temptations multiply. This caloric abundance is not only due to the food itself, but also to its context: the presence of other guests, the associated emotions, the rarity of certain traditional dishes. These exceptional meals become social events where moderation does not really have its place.
A study conducted by the University of Oklahoma observed college students during the Thanksgiving holiday. Their results show an average weight gain of 0.5 kg over a period of just two weeks. This figure rises to 1 kg in overweight or obese people. These differences are not trivial, as they tend to persist. However, it is not the meal on D-Day that explains everything, but rather the entire festive period and its repeated excesses.
Can just one meal really cause weight gain?
From a biological point of view, real weight gain, that is to say a gain in fat mass, requires a significant energy surplus. To store half a kilo of fat, the body must receive approximately 3,500 calories beyond its usual needs. In other words, these excesses should be consumed without burning them, over several days. According to Jamie A. Cooper, a researcher at the University of Georgia, even a very large meal alone is not enough to cause significant fat gain. It’s the repetition over several days that changes things.
What we observe after a festive dinner is above all a combination of water retention due to salt, glycogen stored by the muscles (each gram of glycogen is accompanied by 3 to 4 grams of water), and a volume of food simply in transit. This temporary cocktail can cause the needle on the scale to climb several kilos without this corresponding to a gain in body fat.
A study published by Popular Science highlights that a jump of 2 to 4.5 kg the day after a feast does not reflect a lasting body transformation. This type of variation, described as a “shock on the scale”, is more a matter of internal mechanics than a morphological change.
What the body (really) does with excess calories
The body has a remarkable capacity to absorb occasional excesses. After a food overload, it adjusts its metabolism, slightly increases energy expenditure linked to digestion and reduces appetite the following days. However, this spontaneous regulation only works if the excess remains isolated.
This is precisely where the danger creeps in. Not in the meal itself, but in what it begins. The study published in the journal Obesity showed that the weight gained during the holidays is largely retained several months later, particularly in overweight people. This phenomenon is not inevitable, but it requires a minimum of vigilance.
Among the strategies that work, the simple act of weighing themselves every day during the holiday period, accompanied by visual feedback on the evolution of the weight, allowed some participants not to gain a single gram, or even to lose weight. This type of approach does not involve a strict diet or deprivation, but promotes immediate awareness and discreet adjustments over the days.
So, it is not so much the festive meal that poses a problem, but the shift that it can cause. Because once the leftovers are eaten, the portions doubled and the desserts repeated, weight gain ceases to be theoretical. What the body can absorb once without consequence, it gradually integrates if the occasion becomes a habit. This is why it is not enough to watch yourself the day after a rich meal, but to quickly get back to your cruising speed.
With an unwavering passion for local news, Christopher leads our editorial team with integrity and dedication. With over 20 years’ experience, he is the backbone of Wouldsayso, ensuring that we stay true to our mission to inform.
