 [ Symptoms ] why could my healthy athletic 17 yr old grandson have lost almost 10 pounds in a month  his appetite has decreased he used to be hungry about every two hours after eating like a normal teenager   a lot he is playing varsity football and has been experiencing what appears to be acid reflux [ Disease ] in some cases active teenagers are so busy and stressed that they do not get adequate nutrition and calories it sounds like your grandson is appetite is down and reflux is suspected it is best to get him to a doctor so he can find out if it is acid reflux another gastro intestinal issue or something else for now small frequent wholesome meals that are not fried greasy or spicy and are free of caffeine may improve tolerance and appetite for more on symptoms of acid reflux see this webmd article <link>