What food dilates blood vessels?
Blood vessels are the tubes along which blood circulates round the body. Without blood vessels, transport of materials(oxygen and food) through blood would have been impossible. Hence blood vessels are important to transport blood around the body carrying waste products to excretory organs and oxygen and food to the cells of the body.
If you are referring to Viagra (Sildenafil Citrate), it is a spontaneous generator of Nitric Oxide (NO), a potent vasodilator (dilates blood vessels). This potent vasodilation property enables it to treat erectile dysfunction or pulmonary arterial hypertension, both of which are conditions where the blood vessels become too constricted or could not be dilated upon stimulation.