Key nutrients to monitor include protein for muscle maintenance, iron for energy and oxygen transport, calcium for bone health, vitamin D for calcium absorption, fiber for digestive health, sodium for heart health, and various B vitamins for energy metabolism. Reading nutrition labels and eating a diverse range of foods helps ensure you get adequate nutrients. If you have specific dietary restrictions, consider consulting our resources on food group alternatives. Most nutrients can be obtained through balanced eating of whole foods, though some individuals may benefit from supplementation based on their specific situation.