none. your body is cleaning itself with dietary fiber you get from food especialy fruit and veggies.
find calorie/fitness calculator on the net, enter all your stats and it will tell you how many calories you need a day to maintain, take off 300-400cal off that number and thats how much you need to lose.
eat 5-6 small meals a day (eat every 2-3 hours)
5-8 servings of fruit and veggies a day
8 glasses of water
have complex carbs for breakfast - they give you energy
have lean meat (protein) for dinner - repairs muscle
cardio exercise 4-6 times a week for 30-50min, light weight training
dont consume foods that are made of white flour (white bread, cakes, past etc.), sugar loaded foods (cookies, icecream, candy etc) and nothing fried, oily.
ofcourse you can spoil yourself once in a while with a little treat:)

apparentely yes,

Drinking pure grapefruit juice after every meal burns fat. I ate 3 meals a day and after each meal i had 8 ounces of Grapefruit juice and Iost 10 pounds in 2 weeks. Sont knock it until u try it.

i use green tea mega-t pills and it works really well for me. it helps curve your appetite, and gives you energy. you can find it at wal-mart for about five dollars or less.