Vitamins and minerals are crucial in a diet as they support numerous bodily functions. These micronutrients help in processes like energy production, immune function, and bone health, while also acting as antioxidants to combat free radicals. They are essential for growth, repair, and overall health maintenance. For instance, vitamin C is vital for collagen production, while calcium is necessary for strong bones. A balanced diet, rich in a variety of fruits, vegetables, whole grains, and lean proteins, ensures adequate intake of essential vitamins and minerals to support optimal health and prevent deficiencies.