Spinach

Yes, we all know that spinach should be an integral part of our diet as this leafy green is packed with an excellent source of protein, fiber, and vitamins. Spinach is also high in lutein, a carotenoid that may help prevent age related macular degeneration (a common cause of vision loss and blindness). On the other side, spinach is also high in oxalate, a compound that can lead to the formation of kidney stones so patients with calcium oxalate kidney stones should avoid overdoing it with this veggie.