Accepting our current size is only the first step. Accepting and doing nothing about a life shorting condition is just not a good attitude. Accepting and trying to improve on that condition is acceptable.
Back in the the 1930's, Carnegie made that statement in his book " How to Win Friends and Influence People". That book should be required reading. Most of the concepts can be found in bits and pieces in similar self help books, but it was the first good collection of the principles, something akin to the "Eat Fat and Grow Slim". A history of low carb can be found at http://www.bodybuilding.com/fun/md66.htm