Calorie-free is going to be a bit difficult to find, but the following 25 foods come pretty close:
1. 1/2 grapefruit with Splenda or Equal - 37 calories
2. 1/2 cup of most any mellon - 30 calories
3. 1 lemon or 1 lime - about 10 calories each
4. 1/2 orange - about 30 calories
5. 1 peach - about 35 calories
6. 1 plum - about 35 calories
7. 1/2 cup strawberries - 22 calories
8. 2 scrambled egg whites prepared with non stick spray - about 30 calories
9. 1 stick of chewing gum - sugarfree OR regular contain the same 5 calories
10. 1/2 cup of cabbage - about 15 calories
11. 1 carrot - about 25 calories
12. 3 florets of cauliflower - 13 calories
13. 1/2 cup of celery - 10 calories
14. 1/2 large cucumber - 20 calories
15. 1/2 cup of eggplant - 13 calories
16. 1/2 cup of greens - 15 calories
17. 1 cup of butterhead lettuce - 5 calories
18. 1/2 cup of mushrooms - 20 calories
19. 1/2 cup of bell pepper - 15 calories
20. 1 cup of radishes - 20 calories
21. 1 medium tomato - 25 calories
22. 1/2 cup of turnips - 15 calories
23. 1/2 cup of watercress - 2 calories
24. 1 large marshmallow - 23 calories
25. Diet sodas, extracts, seasonings, spices, and hot sauce contain almost zero calories.
There is ONE zero calorie ingestible good-for-you and that's WATER.
