The best way to lose weight without dieting is through exercises. You can also watch what you eat and ensure that you have a healthy meal. Avoid junk foods and take healthy meals rich in fruits and vegetables.
Do NOT do what Cooliegirl11 said! She's 11 years old & has no idea what she's talking about! That's extremely dangerous & very unhealthy... Exercise is a great way to loose weight. Even if you don't change the way you eat you'll still be burning calories & as long as you burn more then you take in, weight loss will take place.