Food nutrients are chemical substances found in food that provide energy, build and repair tissues, and regulate life processes. Human survival depends on taking in these substances in adequate amounts. Nutrients are broadly grouped based on the quantities required by the body and their primary functions. Nurses must understand these foundational categories to properly evaluate patient diets, especially in busy Nigerian clinical wards where nutritional deficiencies often complicate primary medical conditions.
Macronutrients are required in large amounts daily. They form the bulk of our diet and provide the energy needed for physical work and basic physiological functions.
Micronutrients are needed in small quantities, but they are just as vital for health as macronutrients. They act as catalysts for energy release, immune function, and bone health.
| Nutrient Type | Primary Function | Common Deficiency Sign |
|---|---|---|
| Vitamin A | Vision and immunity | Night blindness |
| Iron | Oxygen transport in blood | Fatigue and pallor |
| Calcium | Strong bones and teeth | Muscle cramps |
| Vitamin C | Wound healing and tissue repair | Bleeding gums |
Deficiencies in these elements lead to specific deficiency diseases that nurses encounter frequently in community health outreach programs.
Water is the most critical component of the human body, making up over half of total body weight. It serves as the medium for all metabolic reactions, transports nutrients and wastes, regulates body temperature, and cushions joints. Dehydration occurs rapidly in tropical climates like Nigeria, especially during bouts of gastroenteritis or malaria. Nurses must monitor fluid intake and output closely to prevent severe electrolyte imbalances and hypovolemic shock.
Dietary fiber consists of plant parts that human digestive enzymes cannot break down. Despite yielding no energy, fiber is essential for optimal gastrointestinal health. Soluble fiber dissolves in water to form a gel, helping lower blood cholesterol and glucose levels. Insoluble fiber adds bulk to stool and speeds up transit time through the colon. Adequate intake of local fiber sources like vegetables, fruits, and whole grains prevents constipation and reduces the risk of hemorrhoids and bowel diseases.
Food must be broken down into microscopic units before the body can use it. Digestion begins in the mouth with chewing and salivary enzymes, continues in the stomach with acid and pepsin, and finishes in the small intestine where pancreatic juices complete the breakdown. Absorption occurs primarily across the mucosal villi of the small intestine into the bloodstream and lymph. Once absorbed, metabolism handles these molecules either by building them up (anabolism) or breaking them down for energy (catabolism).
Nutritional assessment is a systematic method nurses use to evaluate a patient's nutritional status. It involves taking anthropometric measurements (weight, height, Body Mass Index), conducting physical examinations for deficiency signs, reviewing dietary histories, and analyzing lab results like serum albumin. Nurses use these findings to plan therapeutic diets and educate patients on balanced eating using local food groups. Early assessment prevents malnutrition-related complications and shortens hospital stays.