flabby legs and arms...advise please..  

Sport is the only solution. You can be thin but flabby, I don't think even operation or liposuction will help here. Just you have to train the musculs.

Try to lift weights or things as much as you can. No weights? Use softdrink bottles and fill it with water. Lift it up and down while watching television or talking on the telephone. Move it, move it, move it!

cardio exercise is the only way to remove fats. after you get rid of those fats, try to do some strengthening exercises to build muscles.

It’s a good idea to have an idea of the calories that most food items have. If it is a packed thing then the label is sure to have the calories that the substance has.