How can a 13 year old girl Lose Weight?

Look up the flat belly diet and detox diet on google.com or ask.com, the detox diet you can loose up to 40 pounds in a month the flat belly diet has really good recipes and you can loose 5 inches of belly fat in 2 to 4 weeks if you stick with also try lifting weights as you do 50 or more sit ups once or twice a day I hope it works for you and I'm glad you are trying to live a healthier life good luck!!!! :)