This document lists essential nutrients including iron, calcium, sodium, chloride, iodine, fluoride, and phosphorus. It provides food sources for each nutrient, noting that iron is found in red meat, chicken, and fish but not lentils or spinach, calcium is found in dairy and leafy greens, sodium is found in salt, foods, and drinks, and chloride and phosphorus are found in many foods and help form bones and cells. Certain vitamins like C and D aid absorption of some nutrients while substances like tea, coffee, and acids can interfere.