Examples of the different colour groups are
Red foods: red peppers, tomatoes, red onion, red apples, strawberries, raspberries.
Orange foods: carrots, orange bell peppers, sweet potato, mango, oranges.
Yellow foods: banana, sweet corn, yellow bell peppers, lemon, pineapple, corn on the cob.
Green foods: avocado, broccoli, spinach, cucumber, cabbage, peas.
White and tan foods: whole grains (oats, quinoa, rice, buckwheat), flaxseeds, mushrooms, nuts, lentils and seeds.
Blue/purple/black foods: aubergine, berries (blue and black), grapes, figs, plums, purple cabbage.