A 59-year-old Caucasian woman, D.P., is seen regularly in your hospital's diabetes clinic. Daily medications include glipizide ER (Glucotrol XL, Pfizer) 10 mg, pioglitazone (Actos, Takeda) 45 mg, metformin ER (Glucophage XR, Bristol-Myers Squibb) 500 mg, citalopram 40 mg, ezetimibe/simvastatin (Vytorin 10/80, Merck/Schering-Plough), aspirin 81 mg, lisinopril 40 mg. Glycemic control appears good (A1c=7.0), but she has gained >40 lb. in four years (BMI=33). Despite a Jenny Craig diet (1,200 calorie/day) for six months, plus three weekly sessions with a personal trainer, she has lost only 2 lb. D.P. saw a blog claiming pioglitazone causes weight gain-she believes that is her problem. Her physician asks your opinion. What do you say?