Arctic 333 im in D <| sep |> Even the straightest bar must bend <| sep |> Where genetics actually cause obesity when somebody doesn ' t have the receptors to feel full , like PraderWilli as mentioned . Even then , No , read the entire article such as It is now well established that overweight and the different forms of obesity are conditions tending to concentrate within a family . Obesity risk is two to eight times higher for a person with a family history as opposed to a person with no family history of obesity , and an even higher risk is observed in cases of severe obesity . Heritability of obesity may vary depending on the phenotype studied , however it tends to be higher for phenotypes linked to adipose tissue distribution 4055 % and for weight or body fat excess 540 %. Weight gain and adiposity increase with age , an effect also influenced by heredity . the cause of obesity is still eating too much . And what is too much depeneds on your genes . Most people would become morbidly obese if they ate the same amount as I did . I eat twice to triple the average and this is mostly high cal stuff like pastas , noodles , pizza , shoarma and stuff like that . Obviously if you don ' t eat anything you will shrivel up regardless your genes . But the evidence is pretty conclusive at this pointthat depending on your genes that same energy intake and same activity level will make one person obese but the other not . The rest of it implies that genetics can influence your susceptibility to obesity , but requires abundant food supply or little physical activity meaning too many daily calories . Some genes involved could be related to addictive behaviour or gut microbiota . No , it pretty clearly states there is a strong genetic link Beside these rare cases , many individuals have a genetic predisposition that may lead to obesity . Researchers have found many obesity susceptibility genes and the combination of an obesogenic environment and a genetic predisposition will almost inescapably result in the development of obesity . However , it is possible to be obese without having a genetic predisposition . Also , you are an n of 1 and your data is anecdotal . Stating that you must have a fast metabolism because you eat like a pig and don ' t gain weight while you don ' t even count your calories is basically an opinion . Inded , but that is not my argument , my argument is the large wealth of scientific data which conclusively and undeniably has established at this point that there is a strong genetic link with obesity . I didn ' t use my anecdate as an argument , I used it as an example . The real argument is the sciencearticles 0313260313 c h i l d h o o d o b e s i t ygeneticsheritabilityMore and more data and genes identified as linked to obesity keep popping up all the time . Obesity has a strong genetic component , that ' s simply undeniable at this point . Saying that the only times tihs occurs are cases like PraderWill is simply put a scientific falsehood . A lot of obese people do not eat more than average , their metabolism just converts far more of their intake to fat than most people do and other people who are very slender have a large energy intake , their metabolism just converts less to fat . So please , tell me how close to half of the U . S . can somehow defy thermodynamics . It has nothing to do with defying thermodynamics . Your body is free to decide for itself how much of its energy intake it wants to convert to fat , how much it wants to poop out again and how much it wants to burn and in what way and how efficiently it wants to burn it . Obviously eating more will also lead to obesity , no one denies it , but to say it ' s not at least 40 % genetics is silly at this point . There ' s a wealth of evidence to suggest this .