Explain the importance of vitamins in our diet and the consequences of their deficiency.

Vitamins are essential organic compounds crucial for various biochemical processes in the body, acting as coenzymes or cofactors. They play roles in metabolism, immune function, and tissue repair. Vitamin deficiencies can lead to adverse health effects. For example, vitamin C deficiency causes scurvy, vitamin D deficiency results in weakened bones (rickets), and lack of vitamin A may lead to night blindness. Insufficient intake of B vitamins can cause conditions like beriberi or pellagra. A balanced diet with adequate vitamin intake is vital for overall health, and deficiencies can result in a range of debilitating and life-threatening conditions.