You can lose 5-10 pounds in a week for $4 a day. 4 McDoubles from McDonald’s (without the buns) are 240 calories each. This is a total of 960 calories a day. Make sure you drink at least a gallon (128 ounces) of water or non-caloric fluid a day, to flush out the fat you are burning. You’ll also probably need to drink 2-4 bouillon cubes (chicken, beef or vegetable) in water, to replace the salt you will be losing, on this very rapid weight loss diet. Eat 1 McDouble 4 times a day, or eat 2 McDoubles twice a day, or eat 4 McDoubles once a day. It makes no difference what time you eat or how often you eat, as long as you don’t go over 4 McDoubles a day.