Micronutrients and Health: Vitamins and Minerals in Nutrition
Learn how vitamins and minerals support immune function, bone health, energy production, and more.
What Are Micronutrients?
Micronutrients—vitamins and minerals—are essential compounds required in smaller quantities than macronutrients but absolutely critical for health. They serve as cofactors in enzyme reactions, support structural components, and regulate countless physiological processes.
Micronutrient deficiencies can develop when intake falls below requirements, leading to specific health consequences. Conversely, adequate intake of diverse micronutrients supports immune function, metabolic efficiency, bone health, and cognitive function.
Vitamins
Water-Soluble Vitamins
B Vitamins: B vitamins (thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, biotin, folate, cobalamin) support energy metabolism, nervous system function, and DNA synthesis. Deficiencies affect multiple systems.
Vitamin C: Essential for collagen synthesis, immune function, and antioxidant protection. It enhances iron absorption and supports wound healing.
Fat-Soluble Vitamins
Vitamin A: Supports vision, immune function, and cell differentiation. Found in animal sources as retinol and plant sources as beta-carotene.
Vitamin D: Regulates calcium absorption, supports bone health, and influences immune and endocrine function. The body synthesizes vitamin D when exposed to sunlight, supplementing dietary sources.
Vitamin E: Acts as an antioxidant protecting cells from oxidative damage. Supports immune and cardiovascular function.
Vitamin K: Essential for blood coagulation and bone metabolism. Found in leafy greens and synthesized by gut bacteria.
Minerals
Calcium and Phosphorus: Critical for bone and teeth structure, muscle function, and nerve transmission. Adequate intake during growth years supports peak bone mass.
Iron: Essential for oxygen transport in blood and electron transfer in mitochondria. Heme iron from animal sources is more readily absorbed than non-heme iron from plant sources.
Zinc: Supports immune function, protein synthesis, and wound healing. Involved in gene expression and enzyme function.
Magnesium: Involved in over 300 enzymatic reactions. Supports muscle function, energy production, and nervous system regulation.
Electrolytes: Sodium, potassium, and chloride regulate fluid balance, nerve transmission, and muscle contraction.
Dietary Sources and Adequacy
Different food groups provide distinct micronutrient profiles. Whole grains provide B vitamins and magnesium; leafy greens provide vitamins K, A, folate, and iron; legumes provide zinc, iron, folate, and magnesium; nuts and seeds provide vitamin E, magnesium, and selenium; and animal products provide vitamin B12, iron, zinc, and other minerals.
Consuming a diverse diet including multiple food groups ensures adequate micronutrient intake. Food processing and cooking methods affect micronutrient content and bioavailability. Understanding food composition supports informed choices that optimize micronutrient status.