My senior year in college was spent at the university library, Monday through Friday. Conveniently located across the street was Burger King. Every day (except weekends and holidays) I'd do the same lunch: plain burger with small fries and small drink, because it was the cheapest meal within walking distance. After 3 months I'd gained 15 pounds with a noticable bulge in my midsection, and that was with a pretty good exercise regimine including crunches, pushups, weight machines, and daily volleyball practices. To do that meal 3 times a day for a month, supersized, yeah, I can see why this guy ballooned and his cholesterol shot up.
After I graduated, I cut down eating at burger joints and ate a lot of spaghetti and cereal at home instead ($5 at Burger King equals a whole box of cereal, ya know). I lost the 15 pounds I'd gained at Burger King, plus I lost another 10 pounds because I cut my volleyball playing to 4 or 5 times a week and was running the other days (something I did sporadically during college), which contributed to the weight loss.