The other thing I think people forget is that thin people get problems too - they can get diabetes, heart failure, etc. etc. etc. The difference is, our society says that being a size 0 is fine, but being a size 18 is not

There are health problems at either end of the scale - yes indeed.

I find both ends of the spectrum quite concerning....they both inhibit functionality of the human body. Whether that's a size 0 or a size 28+.

An '18' is not large at all, relative to height/age.