Dark green leafy vegetables such as kale and spinach are good sources of vitamin C. Carrots, squash and sweet potatoes are good sources of carotene, which the body changes to vitamin A. Dark green leafy vegetables also supply us with iron. All vegetables are good for us because they supply us with important vitamins and minerals that build cells and keep us healthy. Vitamin C, for example, helps to build strong teeth and helps us to resist infection. Vitamin A helps us to keep skin healthy and protects our eyes. Iron, also an important part of vegetables, build red blood cells. Without enough iron, we would suffer from an illness called anemia.