Different carotenoids are related to their manifest colors. Two of the general categories are carotenes and xanthophylls, with carotenes being present in yellow vegetables, and xanthophylls being found in green vegetables.
Beta-carotene, an essential nutrient that the human body converts to vitamin A, is present in orange carrots, pumpkin and ripe mango.
Another type of carotenoid, lutein exists in marigold, yellow egg yolk, goji berry and dark green kale.
Red tomatoes, grapefruit and watermelon all contain another type, called lycopene.