Weight is one of those things that most people can largely change about themselves. I agree it's a lot harder to regulate your weight when you have conditions that reduce your mobility and make you burn far fewer calories like ME/CFS or fibromyalgia, but the basic principles of thermodynamics still apply.

Trump isn't one of those people with a debilitating condition other than his age. He's genuinely an unpleasant glutton who lives on a diet of Big Macs and Diet Coke.