Carrots

One of Eat This, Not That's 8 Foods You Should Eat Everyday. Most red, yellow, or orange vegetables and fruits are spiked with carotenoids--fat soluble compounds that are associated with a reduction in a wide range of cancers, as well as reduced risk and severity of inflammatory conditions such as asthma and rheumatoid arthritis--but none are as easy to prepare or have as low a caloric density as carrots. Aim for 1/2 cup a day.
Substitutes: Sweet potato, pumpkin, butternut squash, yellow bell pepper, mango
Fit it in: Raw baby carrots, slice raw yellow pepper, butternut squash soup, pumpkin pie, carrot cake

Source: Eat This, Not That