Did the doc test your thyroid? Mine was low so I'm taking pills for that & I'm losing--but very slowly. An underactive thyroid can make you gain weight, have no energy, get depressed, etc. If you are truly improving your diet & ex. you should be able to lose weight so there may be a medical issue. Are you taking medication? The meds I take for bipolar promote weight gain, but I have to take them or I get seriously suicidal.--Suzy