Losing excess body fat can improve health and boost self-esteem and confidence. Numerous conditions can cause rapid weight loss in teenagers. Com, obesity is a common health problem among american teens. The quest for appearances and a better body drive some teenagers to adopt unhealthy eating habits. , teens are also struggling with their weight, with obesity rates quadrupling over the past 30 years, according to the centers for disease control and prevention 1 2. However, because teens are still growing, they cannot follow the same type of weight-loss diet as adults. The only exception is when overweight children lose weight under a doctors supervision. Any unexplained weight loss in a child warrants a call to the doctor. Educate about healthy weight speak with the teen about the possible complications that could arise due to poor appetite. This method can be helpful in cases where the loss of appetite is due to eating disorders and self-imposed restrictions on food. Your teens weight is affecting his health -- physically or mentally -- so youre concerned. Maybe hes been diagnosed with a weight-related health problem, like high blood pressure or sleep apnea. Weight loss may not be a safe choice for kids who havent reached their adult height. Also, make sure your teen is mature enough to consider these options and to understand how theyll affect. Unexplained weight loss has many causes, medical and nonmedical. Often, a combination of things results in a general decline in your health and a related weight loss. Usually, an unrecognized cancer will have other symptoms or abnormalities of laboratory tests, in addition to unexplained weight loss.