
Why you don't need to detox
Revu par Dr Colin Tidy, MRCGPDernière mise à jour par Victoria RawLast updated 14 mai 2025
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Les régimes détox et les cures, souvent approuvés par des célébrités, promettent une perte de poids significative en peu de temps. Mais cette solution rapide est-elle meilleure que d'aller à la salle de sport et de faire des efforts ?
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The simple answer is no. Instead of focusing solely on extremely low-calorie consumption, you should consider the crucial role your brain plays in regulating body weight.
Dr Jason McKeown, visiting scholar in Neuroscience at the Center for Brain and Cognition, University of California, San Diego says that most traditional methods of dieting and detoxing - such as juice detoxes, cabbage soup, eliminating carbs - are ineffective long-term.
"When people stop dieting, this will all almost certainly lead to significant 'bounce back' - with some regaining all of the weight they have just lost," he explains. "Ultimately, your brain automatically controls what weight we need to be, so doing an intense detox for a few weeks almost never leads to any meaningful weight loss in the long run."
During a detox diet, whole food groups are cut out while la caféine, d'alcool, sucre and processed foods are restricted. Most of the weight lost will be water, stored glycogen and waste products, and most - if not all - of the weight will be regained once returning to 'normal' eating habits.
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Is detox necessary?
Scientific evidence suggests that detox diets and cleanses are neither necessary nor valuable. Your body is perfectly capable of eliminating unwanted contaminants. Your liver, kidneys and digestive system, and enzymes in cells, are continuously breaking down toxins and internal waste.
Dr Tuya Chuluuntulga, a GP based in London, UK explains that your body has a robust cleansing system to help you get rid of metabolic waste and harmful toxins.
"When we chew food, amylase enzymes produced by saliva help to break down carbohydrate," says Chuluuntulga. "Proteases break down protein in your stomach and small intestine. Lipases break down fat and oil in your small intestine. These digestive enzymes break down nutrients into small soluble molecules that can be absorbed.
"A variety of waste products are filtered by your liver. Your reins remove waste and toxins from your body. The colon reabsorbs fluids and gets rid of food left over after the nutrients are absorbed from it and other waste. We don't need to detox because it doesn't offer any clinically proven health benefits."
Chuluuntulga adds that not only are detox diets unsuitable for people with certain medical conditions - such as cancer, diabetes, and those with weakened immune systems - they could also harm your health.
"There is no research providing evidence they improve health outcomes such as pression artérielle, or cholestérol," she says. "Nor is there evidence to suggest they have a long-lasting effect on weight."
Safety concerns
Retour au sommaireFurthermore, some detox diets are extreme and if followed for long periods can have negative effects on your body.
These may present as:
Nutritional deficiencies.
A lack of energy.
An increase in food cravings - due to food groups being restricted.
Unhealthy eating patterns and behaviours.
Embarking on a new diet, even a detox, forces you to evaluate your diet, while also being more motivated to increase the amount of fruit and vegetables you eat, drink more water, and cut down on junk food, alcohol and caffeine.
These are, however, long-term efforts and should become part of a alimentation saine regime. They are not a quick fix to régime amaigrissant.
Chuluuntulga says: "There are healthier ways to achieve your target weight - such as adopting a healthy lifestyle.
"It is important to nourish and maintain your body's robust self-cleansing system with a balanced healthy diet, regular faire de l'exercice, adequate fluid intake, sufficient sommeil and a positive mindset."
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A more effective alternative
Retour au sommaireTaking a long-term approach that allows your brain to adjust to weight loss is widely recommended.
McKeown advises you maintain a slow and perte de poids saine, through moderate changes to your lifestyle.
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Petter nutrition choices.
Modest physical activity - such as a brisk walk a few times a week.
"These are much more sustainable and therefore less likely to lead to rebound weight gain," he explains.
Detox diets claim to help eliminate toxins from your body and aid weight loss while also promoting health and wellbeing. However, there is no clinical evidence to support such claims.
While they might help in the short term, the reality is that any weight lost during detox is likely to be regained once you return to your normal eating habits. Instead, doctors and nutritionists recommend a long-term approach to weight loss which allows your body and brain to adjust to a healthier lifestyle - including a diet rich in fruit and vegetables with regular exercise.
Patient picks for Régime alimentaire

Régime et nutrition
Why you don't need to detox
Les régimes détox et les cures, souvent approuvés par des célébrités, promettent une perte de poids significative en peu de temps. Mais cette solution rapide est-elle meilleure que d'aller à la salle de sport et de faire des efforts ?
par Victoria Raw

Régime et nutrition
Qu'est-ce que le régime Ornish et peut-il transformer votre santé ?
The Ornish diet is a plant-based plan, originally developed by Dr Dean Ornish as a way of preventing and reversing heart disease. It promotes a diet low in fat, and high in fibre, alongside significant lifestyle changes. It encourages you to reduce your intake of sugar and processed foods, while incorporating regular exercise, and managing stress.
par Victoria Raw
Questions fréquemment posées
Why do detox diets often lead to 'bounce back' weight gain?
Detox diets are designed to lead to significant 'bounce back' because the brain automatically controls what weight we need to be. When traditional dieting methods, like intense detoxes, are stopped, the body tends to regain the lost weight as it returns to normal eating habits.
What is the primary reason for weight loss during a detox diet?
During a detox diet, most of the weight lost is typically water, stored glycogen, and waste products. This is why the weight usually returns once regular eating patterns resume.
What parts of my body are responsible for natural detoxification?
Your body has a robust cleansing system involving several organs. Your liver, kidneys, and digestive system (including the colon), along with enzymes in cells, continuously break down toxins and internal waste products. They filter waste, dismantle nutrients, and eliminate leftovers after absorption.
Do detox diets offer any long-term health benefits, such as improving blood pressure or cholesterol?
No, scientific evidence does not support claims that detox diets improve health outcomes like blood pressure or cholesterol. There is also no evidence to suggest they have a long-lasting effect on weight.
Can detox diets be harmful to my health?
Yes, some detox diets are extreme and can have negative effects if followed for long periods. They can lead to nutritional deficiencies, a lack of energy, fatigue, and an increase in food cravings due to restricted food groups. They may also contribute to unhealthy eating patterns and behaviours.
What is a more effective and sustainable approach to weight loss than a detox diet?
A more effective approach involves making moderate, long-term lifestyle changes. This includes adopting a balanced, healthy diet rich in fruits and vegetables, engaging in regular, modest physical activity like brisk walks, ensuring adequate fluid intake, getting sufficient sleep, and maintaining a positive mindset. This allows your body and brain to adjust gradually to a healthier lifestyle.
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About the authorView full bio

Kerry Taylor-Smith
Journaliste indépendante
BSc (Hons) Natural Sciences
Kerry has been a freelance writer, editor and proofreader since 2016; she specialises in science and health-related topics.
About the reviewerView full bio

Dr Colin Tidy, MRCGP
Médecin généraliste, Auteur médical
MBBS, MRCGP, MRCP (Paediatrics), DCH
Dr Colin Tidy is an NHS Doctor, based in Oxfordshire.
Historique de l'article
Les informations sur cette page sont examinées par des cliniciens qualifiés.
Prochaine révision prévue : 15 mai 2028
14 mai 2025 | Dernière version
2 Jan 2019 | Publié à l'origine
Écrit par :
Kerry Taylor-Smith

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