I can guarantee you that there is nothing you can say about the health risks of my size that I don't already know. It's not an awareness problem. On the contrary it's impossible to forget and informs literally every other part of my life. I have a lot of shame connected to it and it complicates several of my relationships in different ways.
I had sort of a breakthrough a while back when I realized that the things that my size telegraphs to the world (and to me) are just not true. I'm not lazy- I work my ass off in every other area of life. I'm a devoted mother and my coworkers seem to think I'm good at my job, productive and talented. Why would I believe that about myself because of one thing, my physical size? Why should anyone else believe it about me? To me, that's fat acceptance- don't assume things about people's character or personality because of their size. Engage them as you do anyone else. Don't shame them if they have the audacity to ask you out on a date. (You don't have to say yes but it's not an insult to have been asked out by a fatty.)