what are free calorie foods?
['Strawberry. Strawberries are well loved for their juicy sweetness and bright red colour. ... ', 'Watermelon. Watermelon, like many melons, are considered a dieters best friend as they can be eaten in large portions and are low in calories. ... ', 'Green apple. ... ', 'Broccoli. ... ', 'Celery. ... ', 'Kale. ... ', 'Lettuce. ... ', 'Grapefruit.']