Comment by est31
There is multiple effects fighting against people who want to lose weight:
* habits. often times, obese people use food as a stress response, as a reward, etc. this then makes them relapse.
* "target weight" of the body. there is a memory effect where once you have built up fat tissue, your body wants you to return to that weight. In other words, it's not just the first step that's hard, but all the steps thereafter. Relapse is easy.
* fat tissue makes you more hungry.
* environmental issues, like unwalkable cities, an entire industry putting chemicals into foods that make you addicted to them, its excessive marketing, missing availability of non-processed foods (large percentage of US population lives in food deserts), etc.
It's not just discipline of the individual holding them back.
It's also unlike most addictions, you have to eat few times a day if you don't want to die... alcohol, drugs, gambling are not required to survive, eating is.