Ever meet a dude that can eat like hell and not get fat even though he doesn't exercise? I've met quite a few. How come type 1 diabetes dudes always got no fat on them? You sure it's always as simple as cals in vs cals out and that its easy for everyone to control and it is a good indicator for health? I'm not so sure buddy.
They are called ectomorphs and it all has to do with genetics. Which in turn tells you about their DNA makeup and how their hormones work. Look, in the end it's all chemistry. You have so many factors involved and insulin release, testosterone, estrogen, several glands (hypo and pituitary) T3, T4, IGF, GH, all these are taken into account. Just because you are skinny doesnt mean you are healthy. You can eat like shit, and be skinny, and run blood that looks as thick as Ragu.
I completely understand what you are saying. "FAT" does not make you unhealthy, per say. I don;t think you see that I am agreeing with you.
For me to say, hey you are fat, you are unhealthy would be ignorant. What I simply saying is that the VAST MAJORITY of overweight people have complications due to them living a certain lifestyle. The side effect of that lifestyle is putting on the extra weight. That "fat" lifestyle is unhealthy. If you can't agree with me on that, then we just disagree.