Nutrients are chemical substances obtained from food that the body needs for energy, growth, maintenance, and repair. Dietetics is the practical application of this scientific knowledge to plan and manage food choices and eating patterns. Nurses need to understand these fundamentals to guide patients toward optimal recovery and health maintenance. Food provides the raw materials required for every cellular process in the human body.
Macronutrients are required in large quantities because they supply energy and structural building blocks.
Micronutrients consist of vitamins and minerals. Although required in small amounts, they regulate crucial physiological reactions.
| Type | Function | Common Example |
|---|---|---|
| Water-soluble vitamins | Coenzymes in metabolic reactions | Vitamin C, B-complex |
| Fat-soluble vitamins | Vision, calcium absorption, cell protection | Vitamins A, D, E, K |
| Macrominerals | Fluid balance, bone structure | Calcium, Potassium |
| Trace minerals | Oxygen transport, immune support | Iron, Zinc |
Water is the most critical nutrient for survival, making up over half of total body weight. It acts as a universal solvent, regulates internal temperature, lubricates joints, and transports dissolved nutrients and wastes through the bloodstream. Dehydration impairs renal function and cognitive performance rapidly. Nurses must monitor fluid intake and output meticulously in vulnerable patients.
Dietary fiber comprises plant substances that human digestive enzymes cannot break down. Soluble fiber dissolves in water to form a gel, helping lower cholesterol and stabilize blood glucose. Insoluble fiber adds bulk to stool and speeds up transit time through the colon. Adequate fiber intake prevents constipation, diverticular disease, and hemorrhoids.
Nigerian cuisine offers a rich variety of nutrient-dense foods. Carbohydrates are readily obtained from staples like yam, cassava, maize, and millet. Protein sources include legumes, melon seeds (egusi), fish, and lean meats. Local vegetables such as fluted pumpkin leaves (ugu) and jute leaves (ewedu) provide essential vitamins, iron, and dietary fiber.
Nutritional assessment combines anthropometric measurements, biochemical tests, clinical examinations, and dietary history. Nurses check for physical signs of malnutrition, such as pale conjunctiva for iron deficiency anemia or skin changes for protein-energy malnutrition (kwashiorkor or marasmus). Early detection prevents long-term developmental and systemic complications.
Nurses play a central role in translating nutritional science into accessible patient education. When promoting a balanced diet, nurses must respect cultural food preferences while encouraging dietary diversity. Collaboration with dietitians ensures customized meal plans for patients with specific clinical conditions like hypertension, diabetes, or renal disease.