With each regeneration the Doctor changes, not just in his physical appearance but in his personality, his dress sense, his likes and dislikes. It’s always something of an adventure learning about his new tastes, especially in terms of food and drink, but the adventure is not always a pleasant one. Sometimes he finds he now loathes things he’d always enjoyed before.
Some things remain constants though. Throughout all of his incarnations, he’s hated pears, loved bananas, and no matter what else changes, he knows there’s nothing better than a nice cup of tea. It will always be his favourite drink.