Food problems are almost nill in my estimation. Been here 5 years and only got food poisoning once, and that was from the Belize Biltmore Hotel. March is dry season and mozzies are much reduced, but taking the anti malarials is not bad just need to start two weeks before you arrive and a week or two after. Bottled water is everywhere, but if you have a real sensitive stomach, you will want to avoid the drinks and ice possibly.