The Deer and the Garden

This is the first year I have had deer that are jumping my five foot fence and getting into my garden to chew on my plants, mainly lettuce, squash and zuchinni. I have tried blocking off some plants but they still do get to them. I am still getting tomatoes and carrots from the garden despite them chewing on those plants. If it is not insects or worms, it is predators and now deer.