Tomatoes are the best reported natural source of lycopene and surprisingly, when tomatoes are processed, their lycopene content increases. Therefore, tomato ketchup and tomato sauce also contain high levels of lycopene. Elsewhere, lycopene is also found in colourful or exotic fruits such as papaya, watermelon and pink grapefruit. Other carotenoids where lycopene is found are sweet potatoes, leafy greens like spinach, broccoli, and most varieties of squash.