Need to lose 45 Pounds, any diet suggestions?

I m overweight my current weight is 80 kg and i need to be 60 kg which means that i need to lose at least 45 pounds equals to 20 kgs. does any one know here a diet that would not starve me and will keep me full, i donot have a time limit, meaning time is not critical here, i just need to lose the weight to be healthy