Is there a food that really curbs hunger?

No food has a guaranteed appetite-suppressing power. Protein and fibre are the most studied for satiety, but the evidence is judged weak or limited by available reviews. They remain useful in a varied diet, without being a miracle solution.

Can you lose belly fat by doing abdominal exercises?

A meta-analysis (13 studies, 1,158 participants) found no localised fat loss in the trained area. It concerned the limbs, and trials on the abdomen are fewer and inconsistent. Nothing allows targeted fat loss to be promised.

Are fat-burning supplements risk-free?

No. Their sale without prescription guarantees neither their efficacy nor their safety. ANSES points out that slimming practices are not harmless, and that the benefits of substances whose efficacy has not been demonstrated remain highly hypothetical. Ask a doctor or pharmacist for advice.

Natural appetite suppressants and flat stomach: fact or fiction

A flat stomach on demand: an idea that does not hold up

Promises of a "flat stomach" often rest on the idea that fat can be melted from a specific area, through an exercise or a product. The available work does not confirm this idea. A systematic review with meta-analysis published in Human Movement pooled 13 studies (1,158 participants, 37 comparisons) where only one limb was trained and the other was not. Result: no local fat mass difference between the trained limb and the other, and the authors conclude that no "spot reduction" was observed. This review concerns the limbs, not the abdomen: the matter is not closed, but nothing allows a flat stomach to be promised through a targeted tip.

In the same vein, no food, drink or supplement can guarantee weight loss, let alone at a chosen place on the body.

What fills you up: fibre and protein, with caution

What is best known is that the composition of meals affects the feeling of hunger. Thefoods rich in protein and fibre(legumes, wholegrain cereals, vegetables, seeds) are the usual candidates. But the evidence remains modest: asystematic review from 2020in overweight or obese people found that six studies out of ten concluded there was an effect of protein on satiety, and its authors judge the evidence weak.

In other words, these foods are good pillars of a varied diet, but they are not a guaranteed "appetite suppressant".

Green tea, vinegar, water, chia: what the sources say

Water before meals: arandomised trial from 2010in 48 adults aged 55 to 75 on a calorie-restricted diet reported about 2 kg of extra weight loss over 12 weeks with 500 ml of water before each meal. The sample is small, the age range specific, and the effect was observed on top of a diet: this is not proof that a glass of water is enough.
Cider vinegar: ameta-analysis from 2025of 10 trials reports a drop in body weight, but the trials last only 4 to 12 weeks, are highly heterogeneous, and may suffer from publication bias. The effect on waist circumference is no longer significant when studies at high risk of bias are excluded. The authors speak of a "promising" lead to be confirmed, not a treatment.
Chia seeds: ameta-analysis from 2025covering 8 randomised trials found no significant effect on body weight.
Green tea: as an infusion, EFSA considers catechins generally safe. However, forsupplementsof catechins, it stated in 2018 that doses of 800 mg per day of EGCG can cause signs of liver damage, without being able to define a safe dose. The infusion is therefore not comparable to the concentrated capsule.

For other tips often cited (ginger, konjac and its fibre, glucomannan), we have not found a sufficiently solid source to speak of an established effect. Health claims related to weight that are actually authorised in the European Union are listed in theEuropean Commission register, which also publishes refused claims and the reason for refusal. An authorised claim is always tied to specific conditions of use, often a calorie-restricted diet, and is not a promise of results.

"Fat-burning" supplements: caution is needed

Supplements described as "fat-burning" or "slimming" are sold without prescription, but this proves neither their efficacy nor their safety. In its November 2016 opinion on supplements for athletes (muscle building and fat mass reduction), ANSES reminds that slimming practices "are not harmless" and that the expected benefits of substances whose efficacy has not been demonstrated remain "highly hypothetical", especially given the risks incurred. This opinion concerns athletes, but the agency notes that these products are also used by people seeking to lose weight.

On advertising, the DGCCRF has checked health claims made for food supplements sold online and found unauthorised mentions.

If you take or are considering a supplement, talk to a doctor or pharmacist, especially if you are on treatment. Any adverse effect can be reported to ANSES via the nutrivigilance system.

Bloating or abdominal fat?

A "bloated" stomach is not necessarily one that has grown. According to Assurance maladie (ameli), abdominal bloating is common in irritable bowel syndrome, occurs mainly after meals, alternates with periods of improvement and can be relieved by passing wind or stools. Fatigue, stress, overly heavy or unbalanced meals and ultra-processed foods can make it worse. A stomach that tightens then relaxes therefore does not have the same origin as established body fat.

If bloating is persistent, painful or accompanied by other signs, this is a question to ask a health professional, not a "detox" supplement.

Waist circumference and health

Waist circumference is sometimes used as a health marker: in 2008 the WHO brought together an expert consultation to assess the value of waist circumference and the waist-to-hip ratio as indicators of the risk of chronic disease. It is one indicator among others, which is not read in isolation and is not used to judge oneself on appearance. For an interpretation of your situation, a health professional remains the right contact.

What really helps

No shortcuts, then, but the basics of any reasonable dietary approach:

Build varied meals, with vegetables, legumes and wholegrain cereals, as detailed inDietary rebalancing: where to start?.
Be wary of label promises, relying on our article onmarketing traps.
Avoid "slimming" supplements without medical advice.
Change habits gradually rather than in fits and starts, with a health professional if in doubt.

In Yumiq, the product page shows the number of additives detected (harmless, to watch, risky), and the Yumiq-Score penalises controversial additives assessed by EFSA and ANSES: a way to compare products without relying on the packaging slogan alone.

Natural appetite suppressants and flat stomach: what really works