My now 18-year old had "amoxicillin" as one of his major food groups as a baby/toddler. It was only when he was about 4-5 that we realized he had a dairy allergy. Stopping dairy ended the ear infections. He's gradually reintroduced dairy and usually has no problems, but even now he is guaranteed to get an ear infection if he eats dairy (particularly cheese) while he has a cold.
Zone diet on and off for several years....worked, but too much focus on exact meal composition
Primal since July 2010...skinniest I've ever been and the least stressed about food