Just go back in time 30 years, and people were much thinner. Were they driving around with an empty tank? I don't think so, and neither did they.
Now, weight loss is complex at the societal level, but very easy at the individual level. I am currently on a diet because I want to lose 10 or 15 pounds. Do I find it enjoyable? Not really. But I don't find it torture like I did when I had to have an urological exam. Good planning helps, choosing protein over carbs and fats helps, and after 3 weeks, more or less, the feeling of hunger decreases significantly.
And if you go back in time -- not that they were necessarily better times, I'm just talking about the contexts I write about -- many more men wore a suit and many more women wore a dress. Today, asking someone to wear a dress or a suit seems like asking a stallion to wear a saddle for the first time.
Were those who chose the attractiveness of certain more formal dresses over the comfort of sagging shorts and flip-flops foolish? It seems to me that when people are free from certain social expectations they tend, entropically, to choose maximum comfort, such as unlimited calorie consumption and sloppiness in self-presentation. And one could argue why this modern trend does not also see an explosion in the number of sexual relationships -- after all, sex should be one of our strongest urges. But it has just been replaced by pornography, just as physical performance -- showing one's muscles or strength, or sensitivity of soul and body -- has been replaced with watching professional sports played by others while gorging ourselves on chips and beer from the comfort of the couch.