One pound of fat is approximately to 3500 calorie. Cut down 500kcal per day gives you 1 pound of fat lost per week. Cut down 250kcal per day by simply by skipping one slice of bread (75kcal), one tablespoon of peanut butter (90kcal), and three tablespoons of rice (90kcal). The rest of the 250kcal, you can burn it off easily with simple exercises: 15-min walk to office and 15-min back from office (95kcal) plus 20-min jogging. Set your weight target sensibly with the math! Remember not to push yourself too hard as it may cause lost weight rebound!