I to am type 2 on metformin 1000 twice a day and humulin 1 18 / 20units twice and byetta 10 units twice a day I am on a constant diet I really don't eat very much at all and I have gained about 5 stone in the last 3 years I do exercise and walk the dog everyday why can't I lose weight I have a very hard stomachs a look pregnant all the time I am 57 years Young lol but desperate to lose some weight I have tried so many different diets an the weight piles on can anyone advise on why this is happening