Below are 5 Fat loss 4 Idiots tips on How to Loose Weight in Three Weeks-

1. Expand your regular workout routine beyond basic cardio exercises and try a new plan that mixes in challenging strength training moves for all round slimmer look. The more challenging it is, the more you will stimulate your fat burning metabolisms.

2. Think small - opting for little changes in your diet can make a difference to your fat loss efforts. Look at eating turkey burgers instead of beef, diet soda instead of regular, whole grain pasta instead of white. With small changes, it becomes second nature which will have an impact on your eating habits.

3. Eat smart - never eat straight from a box or container. If you are eating take away food, put the right portion on a plate. And put the package away, then sit down and enjoy your meal, taking your time over
it. Eat slowly and savor every bite.

4. Don't cut "unhealthy" foods completely out of your diet - it will only leave you craving these foods. If you must have chocolate or ice-cream, choose the best forms of these items - that way you'll get some goodness. For example, dark Belgian chocolates are high in antioxidants, and premium ice cream uses calcium rich milk. Also, the intense flavors may mean you won't want, or need as much.

5. Get motivated - set small, achievable results based goals. For example, look at eating 2 pieces of fruits a day and increase the intake after a week. Alternatively, aim to walk an hour twice a week, and increase the intensity and frequency the next week or month. All small steps working toward bigger goals.