According to nutritionists, the following list of fruits and non-starchy vegetables are negative calorie foods that may be consumed raw in any quantity. They all are fat burning foods, which means that they require the same or more calories to digest than they actually contain. In addition they are also a source of healthy vitamins, minerals and fiber.

Fruits:
Apple, Banana, Cantaloupe, Cranberries, Grapefruit, Kiwi, Lemon, Lime, Mango, Nectarine, Orange, Papaya, Peach, Pear, Pineapple, Plum, Raspberries, Strawberries and Tangerine.

Vegetables:
Artichokes, Asparagus, Broccoli, Brussels Sprouts, Cabbage, Carrots, Cauliflower, Celery,  Collards, Cucumber, Eggplant, Green Beans, Kale, Leeks, Lettuce, Mushrooms, Onions, Peppers, Radishes, Spinach, Squash, Swiss Chard, Tomatoes and Zucchini.

Negative calorie diets are easy to stick to because you may eat enough food to keep you feeling full and satisfied. Naturally, you should not negate these beneficial effects by dousing your vegetables with butter or high calorie salad dressings.

Meals can be supplemented with small quantities of meat, chicken, fish, cottage cheese and other dairy products. However, cookies, cakes and other sugary foods are to be avoided unless specified as part of a negative calorie diet.