@AceOfCups
@BMW6 @Boxerdor
A lot of misinformation on here. Research studies now indicate that obesity is caused by an interplay of genetics and environmental causes where powerful hunger hormones have shown to play a huge part. It's not a choice.
So, some people are genetically predisposed to not feeling satiated in the same way as others, and their hunger hormones are strong drivers. If they then live in deprived areas where perhaps they have not been educated about food choices or there is lack of availability of healthy foods at reasonable prices (environmental factors), that obviously plays in. Not to mention that fast food gives a 'rush' and can become addictive.
Basically, hormones often function improperly in people with obesity. Leptin resistance is also common. This imbalance basically causes a powerful physiological drive to eat more and more.
I get why those who are 'naturally' skinny say it's down to their willpower but they don't have the interplay of these strong hunger hormones or lack of, and they feel satiated earlier so it's much easier for them to to stay on the straight and narrow, so to speak.
The new weight loss medications - initially developed for diabetes but investigated for weight loss when they found it was a side effect - reduce food intake by reducing appetite ad hunger whilst also promoting fullness and satiety. Some people on here talk about they are no longer always thinking about food like they did before. The reduction in cravings have also shown some promise that these meds may be able to be used to help those with other addictions (e.g. alcohol).
Of course, once you come off them the transition needs to be carefully managed as those other hormones (genetically predisposed) come into play again.
But it really isn't a 'choice'.