Citrus fruit--the redder the better.
When you choose citrus, think pink, but choose red. The redder the pulp of the grapefruit you eat, the more lycopene you get. Lycopene is a powerful antioxidant credited for improved lung function, reduced cancer risk, and better heart health. Along with a good dose of Vitamin C, red pulp grapefruit can be a great way to meet your recommended five fruit and five vegetable servings a day.
(Journal of Agricultural and Food Chemistry, 2000, Vol. 48, No. 5, pp. 1507-1511)