The US is pretty bad, but it's not exactly awesome elsewhere. People are just not educated about nutrition. They know nothing about protein, carbohydrates, fats, sugars, vitamins, minerals, food sensitivies/allergies, intestinal flora, pollutants and contaminants, or any of those things. People just eat whatever the hell they want, which is primarily junk food, they get fat, slow down their brains, and get even dumber. The biggest offenders are actually the MDs who have all knowledge of nutrition ripped out of their brains upon entering med school. They're dangerously ignorant and, as representatives to most people of how they should take care of themselves, the MDs pass on their ignorance to the rest of the population. The FDA isn't a lot of help either with so much bullshit in their recommendations. Contrary to what most doctors will tell you, mineral and vitamin deficiencies abound among Americans, because they eat such as shitty diet. Trust me, the trace amounts of iodine you get in your salt just aren't enough, and people have magnesium deficiencies left and right, just to mention two.
Some fat people will tell you that they have a "glandular problem." Maybe some don't, but this is actually fairly common. However, if you eat right, you can compensate for a lot of these problems, and there are ways of treating it. But people don't even TRY. They don't listen to what little nutritional advice they do get, so they just keep getting fatter and sicker. They don't take resposibility for their bodies.
So, you know, I don't think it's a problem that airlines micro-optimize their operations to account for passenger weight. People should take responsibility for their own personal health and learn to eat right. If they don't, the rest of shouldn't have to suffer. The thing is, this airline is from Uzbekistan, a part of the world where discrimination is accepted as part of their culture, so they'll actually have an easier time getting away with this sort of thing. If an airline in the US did this, they'd get all sorts of flak over it, although I still think they should be within their rights to do it.
It's shitty nutrition that I think is part of the increase in autism we observe (assuming it's not *just* an increase in diagnosis). But idiots want to blame vaccines instead, because it's easy to not get a vaccine, but it takes proper discipline to change your diet.
And discipline is just not something that's encouraged in most parts of the world.