I'm going to Rome in October and was wondering the same - Pizza, Pasta, Gelati, Panini, it's going to be tough, but then I remembered most of my favourite cheese is italian - Ricotta, Mascarpone, Gorgonzola, Parmesan, Mozzarella etc, The cured meats are possibly the best in the world, and my favourite stew / salad dish is Caponata, but would like to try the genuine Italian version.
I'm wondering how much I'm going to enjoy going to France in Aug, as all the family usually base it around food, and that does involve Croissants in the morning, French Bread with cheese / meat / pate at lunch and eating out in the evening. Will have to stick to very thin crackers with cheese and pate and only have croissants if going for a big bike ride or swimming session I suppose. I can't deprive my whole family of French bread, and I'm sure I wouldn't be able to resist the temptation if it was around.
Mind you, to the barely concealed jealousy of my wife, I usually come back from holidays weighing less and she more.