It's pretty bad... trust me on this... at 21 I was 180-200 lbs, by 25 I was 270... I'm almost 30 now, and overall I'm in pretty good health, other than 3-5 times a day heartburn, a duodenal hernia and a couple of ulcers, oh yeah, and the two non-cancerous tumors around my stomache... oh, did I mention that eating fast food a couple times (2-3) every week for the last 10 years has made my entire digestive tract go to sh*t? So, yeah, it's that bad, and I've been having to work my arse off for the last month to get down to 254 lbs and I'm going to keep going to get to 230. But it's a long hard road once your body get's to this point. So save yourself the grief and lay off the fast food, seriously.