Stick insects eat leaves, and should be given a variety of leaves to ensure they’re getting the right nutrients. Leafy greens are an excellent source of nutrients for stick insects, but you should also offer them fruit and vegetables. Be sure to remove any uneaten food from the enclosure after a few hours so it doesn’t spoil and make your stick insects sick. As for how much to feed them, that depends on the size of your insect and the size of the enclosure. A good rule of thumb is to give them as much food as they can eat in 2-3 hours.