That's a good question and one that I will never understand. I was driving through a national park a few weeks ago and drove by the entrance booth where you pay and get a map. There was a horrendously overweight "park ranger" sitting inside that must have been between 400 and 500 pounds. It was mid afternoon - about 3 pm - and she was snacking away as she worked. She slid the window open to take my money and about half of her spilled out the side - truly one of the most disgusting things I have ever seen. How somebody that big could ever live with herself and CONTINUE adding to her own gluttony by constant excessive snacking is simply incomprehensible.