I don't. And since everyone is just spouting opinions I'll add mine. We've been messing with the food supply too much. We're consuming vast quantities of starch and stuff sweetened with corn syrup and who knows what else. I think we might be engineering our way into bad health.
Also, and this is not a character flaw, I don't think people are honest with themselves about how much sugary stuff they consume. I've been thin all my life (for various reasons, not the least of which is a physically active lifestyle) but I went through a period where I was hanging out with some guys who went to the vending machines every afternoon. I ended up eating a lot of candy and I put on 10+ pounds in no time. The great thing was that I realized what was going on and stopped eating any sugary stuff and the weight dropped right back off.
At work I see people who talk about wanting to lose weight and yet get ice cream every day. It's not a character flaw, but it is a choice. If it's not important to you I'm OK with that. We all have our priorities.