Why don't people realize most of their health problems are caused by being overweight

Why won't my friend realize that her health problems are because she is overweight. She talks about when she works out (which is walking fast every month) she gets bloated. She talks about how its her Edema. Which is a pre-diabetic issue, RIGHT?!. She talks about her back pain, horrible periods and cramps and her lack of energy like they are all separate entities. I hope she can get to a place where she realized if she lost the 50 extra pounds all of those problems would go away.