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Why not, for example, a drug that suppresses appetite? We have many already. Technology has an endless supply of solutions.
Humans are driven by biology, and psychology is only a thin abstraction on top of that. The amount of self-discipline any single individual can deploy is very limited. If that discipline threshold gets used up on other things, it's not going to be available for food and diet.
Consider on top of this that most of us have been socialized and trained for decades to prefer unhealthy options, and the already-steep incline of resisting the body's physically preferred options becomes treacherous.
Most fat people aren't fat becomes they're snarfing down platters that are meant to feed six in every sitting. They're fat because the foods they eat provide low nutrition and high calories, and candy bars aren't the only food with such a profile. Most packaged foods that you can buy at a regular, non-niche grocer are that way, even the ones that are touted as healthy. Food companies do this because they know people like foods with more calories more than they like foods with fewer calories, and they want you to buy their foods more often.
Technology got us into this mess by creating an easily-accessible supply of hyper-caloric foods, an amount of plenty that our bodies, built for scarcity, are not at all equipped to handle. Technology should be employed to fix it. Whether it's human-side or food-side, something needs to be developed that can blackhole the excess calories with no noticeable impact on the eating experience, either in taste or chemical reward.
The other alternative is to revert to a food supply where artificial contrivances such as candy and foods injected with sugars and other unnatural taste-improving formulations are very rare. This is not possible while we live in a society of abundance. It will only be possible if there is famine, hardship, war, etc. So it's not a good option.
"Just try harder" is never going to be a real answer to this problem, and the stats clearly bear that out. People hate being fat. They spend billions of dollars every year desperately trying to find someone who can fix it for them. We should try to address that in a reasonable way.
Caffeine.
Obese people often have a low socio-economic status [1]. If you are marginalized, eating may be an outlet for frustration. You won't buy special stuff to lose weight.
Everyone here was surprised when Trump got elected (except Peter Thiel). "Nerd nation" [2] is a huge bubble -- the majority of our society is different. The won't buy any drugs or apps.
[1] http://www.noo.org.uk/uploads/doc/vid_7929_Adult%20Socioeco%... [2] http://www.newyorker.com/magazine/2015/05/18/tomorrows-advan...
It's not that obese people don't care or don't know, or that they enjoy living an unhealthy lifestyle. There's a lot of complex factors that are involved, but the basic factor is this: humans are evolved to strongly prefer high calorie foods, and we've made high-calorie foods available in unprecedented quantities while also requiring less physical energy expenditure than ever before. Our bodies don't know how to deal with that.
It's been thoroughly proven over the last 30 years that self-control can't be relied upon to prevent this. When you throw someone into a situation where all of their biological functions are pushing them toward acquiring a biological reward that is so abundant they have to actively avoid it, the options are very limited. That person is going to have a lot of difficulty refraining from acquiring the reward. That's true for everyone, and the issue is generally only avoided if your body has never learned the reward in the first place or if you've trained your body to forget the reward (and in both of these situations, as soon as your body learns to desire that reward, you're back at risk).
We need a solution that a) constrains the supply of hyper-caloric foods, which is not practical, because again, if it's available, good luck keeping it out of peoples' hands; or b) modifies either the foods or the consumers of said food so that the excessive calories are neutralized and the same neurological rewards are obtained.
[0] http://washingtonmonthly.com/2016/05/02/what-the-60-billion-...
