Citrus fruits are an excellent source of vitamin C. Deficiency in this can lead to scurvy as well as other conditions and diseases. Additionally, they are also a great source of vitamin A, fiber, and folic acid. These help blood cell formation and growth, prevent liver disease, and helps fetuses avoid developing neurologic problems as well as other issues when pregnant women consume these nutrients. They also contain components that are shown to reduce risk for heart attacks as well as certain cancers.