Vitamins and minerals are essential nutrients that regulate body processes and help with enzyme reactions, even though they provide no calories. Vitamins are categorized as fat-soluble or water-soluble, and both are important for various functions in the body like vision, immune function, cell growth, and energy production. Deficiencies of certain vitamins can lead to diseases, so it is important to obtain vitamins from food sources. Minerals also serve critical roles in the body and are divided into major minerals and trace minerals, both of which are involved in processes like bone health, muscle function, and nerve signaling.