Chicken, brown rice, veg. No carbs, no fizzy drinks, no beer (spirits are ok, but avoid mixing them too much so find something you like the taste of or can mix with tonic water). Meal sizes are important, 3 meals a day, can have say 30g of cereal or 2 slices of toast in morning (jam/preserve is ok but avoid choc spread etc). Lunch and Dinner should be relatively small; just about the size of both your fists will do (I do mine slightly smaller). Exercise some more, walk where possible, take stairs, some weights if you can.
The fat falls off leaving you lean.
Alternatively try a Paleo diet.