Decided to get my act together regarding my weight when I was 19, I was 15 stone (am 6 foot all) used to have around 8 teas and coffees a day, each with 2 sugars, I cut down to 1, then to just a sweetener and then down to none at all. I worked really hard at the gym and ate very healthily and lost 3 stone in 3 months, then a further 1 and 1/2 stone over next 3-by which time I was underweight and put a bit back on. Was only diagnosed with Type 1 last year and am now 11 stone (still lower than I should be)
but the point is I lost weight as I was cutting out 16 teaspoons of sugar a day, this was 9 years before I was diagnosed with diabetes, I know its difficult but just do it gradually, I am now at the stage where I cannot drink a cup of tea/coffee at work if my colleague makes his drink first (with sugar) as I can taste it and it makes me feel ill