I'm sure she once heard a story about a lady with a genetic defect leading to her obesity problems (body incapable of burning fat) and she latched on to that as being her problem too! "I can't help being fat. So I might as well continue eating 5 frozen pizzas with my Wendy's triple stack every night." Ignores the fact that something like 1 in 100,000,000 have the defect.