Sometimes losing weight seems impossible. But with this low fat diet you will finally be able to get some results. Part of slimming down involves a simple, sensible exercise and eating plan. Here's a week-long menu for our Lose 20 Pounds Fast Diet program: Over the next 90 days you should aim to consume 1,200 calories a day plus calorie-free beverages as desired, and take a multivitamin and a 400-milligram calcium supplement daily. Eat more 4 less fat and saturated fat and you will get better results.