Gaining weight for no reason: 8 common causes

Those pesky extra pounds! You’ve noticed you’re putting on weight, but you can’t quite explain why. Is it really possible to gain weight for no apparent reason? Or is there always a cause — and if so, what might it be?

Why am I gaining weight?

Let’s set the record straight right away: you never gain weight for no reason. There is always a cause, whether metabolic or lifestyle-related. And sometimes, small habits are to blame — especially when they add up. Here are the most common reasons people gain weight without really noticing.

Reason n^o1: regular alcohol consumption

You don’t drink often, but you never say no to raising a glass. A little aperitif here, a birthday celebration there. By the end of the year, the toll can be significant. Because yes, alcohol does cause weight gain:

• It is highly caloric, as one gram of ethanol contains 7 kcal — more than a gram of table sugar.
• The sugar in alcohol is completely useless to the body: these are empty calories. It is difficult to metabolise, places a heavy burden on the liver, and is stored directly as visceral fat.
• Alcohol disrupts the feeling of fullness and encourages you to eat more than you should.
• It affects food choices and increases cravings for fatty, salty foods.

So if you feel like you’re gaining weight, your alcohol intake may well be the reason. You know what to do…

Reason n^o2: a sedentary lifestyle

Your idea of a perfect day is staying cosy at home. You enjoy sport from the sofa. You take the car for even the shortest trips. In a word: you don’t move enough. A sedentary lifestyle not only leads to excess weight, but also to poor health — with risks including diabetes, high cholesterol, cardiovascular disease, and even cancer. In any case, a lack of physical activity is undoubtedly behind those extra kilos. To break the cycle, it’s essential to bring more movement into your daily life:

• Leave the car at home and get around on foot or by bike. It’s the simplest way to get moving and burn calories. Even short trips make a difference…
• Embrace fun, active pursuits: playing with your dog, gardening, dancing with friends, going for a scooter ride, strolling around the city on foot…
• Find a sport you genuinely enjoy — and you really are spoilt for choice, with so many activities out there…
• Make it enjoyable: if exercise feels like a chore, you won’t stick with it.

Reason n^o3: poor food choices

Nutrition advice tends to go in one ear and out the other. You’re convinced your diet is perfectly healthy, and that it couldn’t possibly be the reason you’re gaining weight. Yet what seems fine to you may not always be. A balanced, varied diet should primarily provide the macro- and micronutrients the body needs to function at its best. According to ANSES and the WHO, it should include:

• Carbohydrates at around 55%
• Fats at around 30–35%
• Proteins at around 10–15%
• The vitamins and minerals the body requires
• Enough water (1.5 to 2 litres per day)
• Plenty of fibre

It’s worth noting that fats should ideally be mono- and polyunsaturated, carbohydrates complex and low-GI, and proteins lean. In addition, salt, sugar and saturated fats should be kept to a minimum, while fresh produce should take centre stage. It may be time to take a closer look at your overall diet to identify where the unnecessary calories are coming from. A fan of ready meals? Unable to resist a croissant at breakfast? A devoted cheese lover who has some at every meal? Spread on toast is your favourite snack ? There’s no mystery here: weight gain always has a reason, and yours may well be a tendency to make poor food choices.

Reason n^o4: the ready meal reflex

This one ties in with the previous point: you hate cooking. Or by the time evening comes, you simply can’t face standing at the stove. So you automatically reach into the freezer for a ready meal, heat it up in a few minutes in the microwave, and eat it in front of the TV. Or you’ve fallen into the habit of ordering delivery, just a thumb-tap away on your phone. The main problem with these quick fixes: you have no control over what you’re eating. Not the portion sizes, not the preparation, not the quality of the ingredients. Rest assured, this lazy habit is very likely the reason behind your weight gain. Slim people enjoy food just as much as you do — they just make the effort to cook. To avoid gaining weight, it’s worth rolling up your sleeves and committing to cooking at home. It doesn’t have to be complicated or time-consuming: preparing delicious meals can actually be wonderfully simple. Feel free to browse recipes online or invest in one of our cooking guides, such as our 50 Super Easy Slimming Recipes Guide or our 50 Slimming Recipes in Under 20 Minutes Guide.

Reason n^o5: poor sleep

Does sleep affect weight? Absolutely! Because at night, our bodies are far from fully at rest:

• They burn calories needed to maintain vital functions.
• They regulate many hormones involved in weight management — including ghrelin, the hunger hormone, and leptin, the satiety hormone.
• They metabolise dietary carbohydrates in preparation for the next day’s physical and mental activity.

If you sleep too little, or poorly, this whole mechanism goes off balance. You store more, your hunger and fullness signals are disrupted… and you gain weight. To prevent this weight gain, it’s important to take care of your sleep. Go to bed early and at regular times (even at weekends), keep your bedroom cool and well-ventilated, and ensure darkness and quiet throughout the night… for restful, restorative sleep — and fewer kilos!

Reason n^o6: snacking

Your weakness is dipping into the fridge or the cupboard every couple of hours. Yet snacking is the number one enemy of a slim figure. Eating constantly throughout the day puts a strain on your digestive organs and keeps your body secreting insulin non-stop — not to mention the calories consumed, which add up to a surprising amount by the end of the day. Try to identify why you snack: genuine hunger or simply the desire to eat? If it’s the former, your meals may not be well-balanced enough — in which case, it’s worth focusing on eating better. If it’s the latter, it may be worth digging a little deeper to understand why you eat (boredom, stress, sadness, frustration, anger). Emotional eating doesn’t have to be inevitable — you can seek support from a nutritionist, a doctor, or a psychologist.

Reason n^o7: stress

Stress is also a reason for weight gain. It can lead to snacking, as mentioned above, but it can also trigger excess cortisol production. What’s that? It’s a hormone naturally produced by the body to help manage short-term stressful situations (waking up, rapid memorisation, emergencies). But in cases of chronic stress, cortisol is produced continuously, which can have an impact on weight. It stimulates insulin production, which in turn promotes fat storage. To avoid weight gain, it’s essential to let go of stress: avoiding anxiety-inducing situations, relaxation, meditation, better organisation… There are countless ways to break the vicious cycle.

Reason n^o8: medication

Certain medications — such as corticosteroids, an ill-suited contraceptive pill, HRT, beta-blockers, or some antidepressants — can cause weight gain. These chemical compounds have a direct impact on hormonal balance, which in turn influences our tendency to store fat. The best course of action is to discuss your concerns with your prescribing doctor, so they can adjust your treatment and minimise any associated weight gain.

Is there a helping hand to be found?

As you’ll have gathered, weight gain always has a reason. Once you identify it and take corrective action, you have every chance of losing weight. And if you’re looking for a little extra support to help you slim down faster, we have the solution!

• Our Slimming Cosmetics Pack, featuring our best-selling body care products (cryo and night slimming treatments, the Dry Slimming Oil and the Thermoactive Slimming Cream), lets you adopt a complete body routine for guaranteed centimetre loss all over: thighs, waist, stomach and buttocks.
• Our Weight Loss Programme, a food supplement routine (Slimming Capsules and Slimming Drainer) combined with coaching, supports gradual, long-term slimming.