Tomatoes are full of health-promoting nutrients including minerals, vitamins C and E, β-carotene, lutein and flavonoids such as quercetin. It is an excellent source of the antioxidant lycopene (the red pigment in tomatoes) and studies have shown that tomato consumption is associated with a decreased risk of certain types of cancer, including breast cancer and prostate cancer, and cardiovascular diseases. Certain variants such as the San Manzano tomato and cherry tomatoes are particularly high in lycopene.
Nothing beats fresh sun ripened tomatoes but cooking actually increases the bioavailability of lycopene. Keep the skins on as these are full of lycopene