An investigation broadcast on France TV has just set the record straight on a divisive topic: obesity. Under the evocative title “Health Investigation: You don’t choose to be fat”, the documentary debunks a stubborn misconception. Indeed, obesity is not a lack of willpower. On the contrary, very concrete biological and social factors explain why we are not all equal in the face of this disease.
At MounjaGO, this program echoes what we remind our community. Obesity is a complex and multifactorial disease that cannot be treated with judgment. If you wish to learn more, you can watch the full report on YouTube to discover all the testimonials and expert opinions.
What the report says: obesity, chronic disease, and biological factors
Marina Carrère d’Encausse opens the program by recalling a striking figure: nearly one in five people in France is obese. Too often reduced to a lack of willpower, obesity is in reality a chronic, complex disease that is still poorly understood by the general public. To illustrate this, the program combines the testimonials of four patients — Séverine, Quentin, Frédéric, and Sabrina — with the opinions of medical experts on treatments and management.
Testimonials illustrating diverse journeys
One of the documentary’s strengths is the testimonials. They show how different and deeply personal each journey is.
Séverine lost 45 kg thanks to medication. She recounts having long avoided her own reflection and shops due to unhappiness, explaining that she “ate her stress, anger, and sadness”. After four years of treatment, she finally regained self-confidence. Her doctor emphasizes, however, that despite weight loss, obesity remains an incurable disease that requires ongoing monitoring.
Maéva, 39, experiences her weight as a real daily handicap: shortness of breath, difficulty putting on her shoes, inability to play with her children. To regain this life, she decided to self-finance an injection treatment costing 300 euros per month. The result: after just one month, she has already passed the symbolic 100 kg mark.
Bruno, for his part, underwent bariatric surgery (sleeve) ten months ago, going from 162 kg to 122 kg. His turning point? No longer being able to zip up his motorcycle suit. For him, this operation represents a true rebirth.
Sophie benefits from experimental and comprehensive care: nutritionist, dietitian, and psychologist. She explains that obesity set in after several life shocks (breakup, bereavements, menopause). Since then, she has been learning to manage her emotions in ways other than through food.
Obesity is not a matter of willpower: the biological factors involved
The experts interviewed in the report are clear: obesity is primarily a biological disease of adipose tissue, which communicates poorly with the brain. Willpower, therefore, has almost nothing to do with it.
Genetics plays a major role. Professor Claude Bouchard demonstrated that when faced with the same overeating, individuals gain between 4 and 13 kg depending on their genes. In other words, two people who eat exactly the same thing can have radically different results. It’s not a lack of effort: it’s a pure biological difference.
The brain and hormones regulate hunger, not willpower. Ghrelin, leptin, and insulin function differently among individuals. Some people with obesity, in particular, exhibit leptin resistance: their brain never receives the signal “I am full”. This results in chronic hunger, entirely independent of any voluntary behavior.
Low-calorie diets fail for a precise biological reason. When the body undergoes caloric deprivation, it lowers its basal metabolism to adapt. Then, when the restriction stops, it stores fat even more efficiently. This is the infamous yo-yo effect, which has led millions of overweight individuals to frank obesity.
The gut microbiome also influences weight. Partially inherited and conditioned by the environment from childhood, the composition of intestinal bacteria can, depending on the individual, promote or hinder fat storage.
Social factors: inequality in the face of obesity
While biology explains a large part of the disparities, social factors amplify these inequalities. The France TV documentary rightly emphasizes this point, which is too often minimized.
Access to healthy food is unequal. In many geographical areas, junk food is often the only affordable option for low-income households. However, ultra-processed food disrupts hormonal mechanisms for weight regulation, regardless of individuals’ willpower.
Chronic stress also promotes weight gain. Cortisol, the stress hormone, stimulates abdominal fat storage and increases cravings for high-calorie foods. Consequently, populations most exposed to social or economic stress are biologically more vulnerable to obesity.
Medical fatphobia finally exacerbates the situation. When patients avoid doctors for fear of being judged, comorbidities (type 2 diabetes, hypertension) silently worsen. According to the French National Authority for Health, discrimination in care is now a recognized public health factor.
Quentin and Sabrina: two faces of the fight against fatphobia
Quentin testifies to the harassment he has suffered since childhood: “Fatso”, “Lazybones”… He also recounts the medical stigmatization that long kept him away from care. Since then, he has created the association “Deux poids, Deux mesures” (Two Weights, Two Measures) to fight against these prejudices, and has even composed a song to promote kindness.
Sabrina, a TikTok influencer, advocates for the body positive movement. She uses humor to respond to attacks and encourages women not to “wait to be thin to live”.
GLP-1 treatments for obesity: a revolution… but at what cost?
The report details GLP-1 medications, which have become a revolution in the treatment of obesity and its biological factors.
These new molecules mimic a natural intestinal hormone to increase satiety and decrease appetite, acting directly on the hypothalamus. Medications like tirzepatide (Mounjaro) or semaglutide (Ozempic, Wegovy) thus act precisely on the hormonal mechanisms that malfunction in people with obesity.
However, the program raises a crucial point: stopping treatment often leads to significant weight regain. Indeed, the body’s biology tends to return to its previous state. This is why Dr. Lecornet-Sokol and Professor Pattou emphasize the need for lifelong multidisciplinary follow-up.
The debate on the recognition and reimbursement of obesity
Anne-Sophie Joly, president of the National Collective of Obesity Associations, advocates for obesity to be officially recognized in France as a chronic disease. This has already been the case at the WHO since 1997, and more recently in Italy. In France, however, the delay remains notable.
Today, the cost of new medications (Wegovy, Saxenda) remains entirely at the patient’s expense, thus creating a profound social injustice: only those who can afford 200 to 300 euros per month have access to the most effective treatments.
Furthermore, doctors receive only 3 hours of optional training on obesity during their curriculum. Dr. Lecornet-Sokol and Professor Pattou therefore call for a complete overhaul of this training, to put an end to medical mistreatment and ensure appropriate follow-up for each patient.
What this documentary changes for people with obesity
Documentaries like the one from France TV play an essential role: they change collective perceptions. Because while medicine has advanced considerably, mindsets are still struggling to keep up.
Treating people with obesity as individuals lacking willpower is not only inaccurate. It is also, and above all, detrimental to their health. Shame and guilt are obstacles to care; they are not drivers of change.
Recognizing the complexity of obesity therefore opens the door to more humane, more effective, and fairer care.
In summary: obesity and biological factors
Obesity is a multifactorial disease in which genetics, hormones, the microbiome, stress, and social inequalities play a role at least as important as individual behaviors. The documentary “Health Investigation: You don’t choose to be fat”, broadcast on France TV, powerfully and pedagogically reminds us of this.
At MounjaGO, we believe that every person deserves respectful care tailored to their biology. If you have questions about available treatments for obesity, consult our guides on GLP-1 treatments or speak to your doctor.