Count your calories, exercise, and weigh yourself every day. If you count calories you will choose veggies and fruits more, because otherwise you will be stuck eating almost nothing. 500 calories a day less will get you to lose 1 pound a week, if you are adding in more exercise than usual you might lose closer to 2. Don’t do anythng to an extreme. Losing more than 2 pounds a week will be impossible to maintain for a long time.