There are a number of foods that are poisonous to sugar gliders. Some include drinks that contain sugar and/or caffeine, lettuce and other green leafy vegetables, Brussel sprouts, avocado, cauliflower, garlic, onions, peas, turnips, fruits pits, dairy products, any type of candy. If you can, buy organic produce. If not, wash produce very well before feeding to your sugar glider.