Remove the lens, and one gets the obvious change: (over)abundance of food. There is so much food produced today that much of the "imperfect" fruits, vegetables, and meats are simply thrown out, choking our sewage and refuse systems. You may have contributed by sending a steak (noble grub) back for being overcooked, a truly royal act in the past, which goes straight to the garbage. Blame modern food regulations for that fact that most imperfect steaks don't make it down a soup line person's gullet, which any past royal would have figured how to do.
Now, in many developed countries, there is an obesity epidemic. Even I, who don't readily register as fat, am statistically obese by modern standards. While many people attribute this to eating too much or the wrong sorts of food (that rich, royal diet), I will add another aspect which better explains why people who eat about the same as I do fall into such different camps in the body shaming racket: efficiency.
To my mind, some people are very efficient (fat) and others are not efficient (not fat). My boss is constantly on about increasing our efficiency by planning ahead, which I don't put much effort into. I walk between a set of buildings and don't give much thought to making sure I handle one building's work before I move onto another and send up walking randomly all over the place in a very inefficient way. Is that why I don't look all that fat?
I once worked with a man who was likely far more efficient than I am. I say this because I wouldn't be surprised if he was over 600 pounds and had specialized equipment and assistants to get him through his workday. I couldn't afford such things and I doubt I would justify the company putting out like that for me, so I figure he had some amazing skill and efficiencies that made it all worthwhile in a business way. He rarely moved from his desk, unlike me, so his measure of productivity must have been comparatively through the roof. I was always going to and fro, talking with people that I needed something from or that needed something from me. I could have made calls instead, but was usually too lazy to look up numbers. Thus my theory, efficiency breeds lack of unnecessary exercise.
I also have to say that there are any number of people, specifically employed by the government, that I wish were somewhat less efficient. To my mind, a lot for Liberty in personal life is lost to busy government workers, whom I would just as soon stayed home and didn't attend so "efficiency" to separating people from their liberties in their things.
