The idea of weight loss has become ubiquitous, to the point that many end up believing they absolutely must slim down. Yet, unless there is a vital medical necessity, your body has no obligation to change. And when it resists, it's not a personal failure, but a subtle message it's sending you. A protective message, often ignored.
When metabolism pulls the emergency brake
Weight loss is often presented as a simple calculation: eat less, move more. In reality, your body functions like a finely tuned machine, programmed to survive, not to conform to aesthetic dictates. When you enter a process of restriction, whether through a strict diet or constant mental pressure to "become thinner," it immediately triggers a series of sophisticated mechanisms to maintain its equilibrium. And that's where your infamous plateau begins.
Your body, true to its protective instincts, then slows down your basal metabolic rate , a phenomenon scientists call adaptive thermogenesis. Simply put: your body burns fewer calories to conserve its resources. It's as if your body is saying to itself, "We don't know how long this period of restriction will last, so we might as well conserve our energy." This is a survival mechanism inherited from hundreds of thousands of years of evolution. It has nothing to do with a lack of willpower or a so-called "letting go."
Your body is simply adapting. This adaptation can be so effective that, even while eating the same amount as before, you expend less energy. It's as if your internal system is reducing its electrical consumption to ensure its own safety.
Hormones enter the scene
Weight loss also alters a whole cascade of hormones. Again, your body is telling you something:
- Ghrelin, the hunger hormone, increases. It makes you eat more, sometimes at times when you weren't hungry before.
- Leptin and peptide YY, the satiety hormones, decrease. As a result, you feel less full, even after a full meal.
It's not you who's "cracking." It's your hormonal system doing its job of maintaining balance. Your body is trying to avoid a prolonged deficiency, which it perceives as dangerous. It therefore amplifies the feeling of hunger to encourage you to restore an energy intake deemed safer.
When the brain takes over
Your brain also plays a central role in this process. It doesn't just regulate hunger; it also manages the concepts of food pleasure, motivation, and emotional response. During a diet or a period of intense mental restriction, it can activate what is known as emotional hunger . This means that your brain, which hates stress and deprivation, seeks to soothe you as it has learned since childhood: through food, a source of accessible and immediate comfort.
Furthermore, each individual has different metabolic responses. What works for your neighbor won't necessarily work for you, because your brain, hormones, body history, and emotional experiences form a unique whole. It is this uniqueness that makes you a complete person, not just a "weight loss project."
The equilibrium weight: the idea that no one explains to you
One fundamental concept sheds light on all these reactions: equilibrium weight. This is the weight your body naturally tries to maintain because it considers it optimal for its functioning. This weight is established very early in life, under the influence of many factors: genetics, environment, childhood diet, hormones, stress, physical activity, etc.
Imagine your equilibrium weight as an internal thermostat. You can nudge it up or down a little, but if you try to stray too far, your body immediately activates its defense mechanisms to return to what it considers a safe point. So it's not that you "can't do it." It's that your body refuses to yield to a change it deems excessive or dangerous. It doesn't follow current aesthetic trends. It follows its own biological logic.
A normal phenomenon
Contrary to what the diet industry would have you believe, resisting weight loss is not a flaw. It's a normal and healthy physiological reaction. A slowing metabolism, increased hunger, readjusting hormones, and insulin influencing energy availability: all of these are signs that your body is protecting you.
This resistance can sometimes be exacerbated by insulin resistance, making fat mobilization more difficult. It can also cause fatigue and decreased motivation. Again, you're not the problem. These are invisible, but perfectly natural, mechanisms.
Rethinking weight loss with respect for the body
Ultimately, the question should always be: why do you want to lose weight? If the answer relates to your vital health, then understanding these mechanisms can help you approach the process with more gentleness, less guilt, and more professional support.
On the other hand, if the goal is to conform to toxic beauty standards, your body image issues might be a valuable reminder: you don't need to transform yourself to earn respect, love, or self-confidence. Your body isn't a project to be fixed, but a partner to be listened to.
Ultimately, understanding these biological mechanisms allows you to adopt a more compassionate, realistic, and profoundly human view of your relationship with your body. By accepting this silent dialogue, you give yourself the opportunity to move forward not against yourself, but with yourself.
