Excessive burping...please help

Hi everyone,

For the past 4 years, my sister has been burping excessively after eating (sometimes off and on for HOURS afterward). She is a petite 21-yr-old and relatively healthy despite the fact that she eats a typical American and Asian diet and she only exercises once in a while. This symptom doesn't hurt but it is abnormal...what's going on? I'm thinking her digestive system is a little off balance? I think maybe she should cut some junk food and start with probiotics and enzymes? Please repond with any ideas.

Much appreciation,
+Energy