Iam a diabetic and also hypothyrodism since last 2 years. my thydoid is contolled and also sugar level.My HBA1C is 6.for sugar iam advised METFORMIN 500 mg BD.But iam loosing weight regularly.Now, instead of taking 2nd dose of Metformine 500 mg i have started taking Vildagluptin 50 mg at bedtime. Will this solve the Complications caused by Metformin. Secondly, being hypothyrodism why am i lean and thin? pls. advice.