Yup.    Or they take something that does have an effect and they exaggerate it to fit their situation.  Like how PCOS or a thyroid problem must be responsible for them gaining 300 pounds, even though in the overwhelming majority of cases it can only be responsible for a comparatively tiny fraction of weight, and meanwhile plenty of people   55c  have these issues and aren't fat.  And a lot of them just self-diagnose anyway.  "Oh, I must have a thyroid condition even though I've never actually been diagnosed by a doctor as having it."