Malnutrition: what it means and why it matters
Malnutrition is a condition that occurs when the body does not receive the correct amount or balance of nutrients needed to stay healthy. This problem is not limited to hunger alone. A person may eat too little, eat too much, or consume foods that lack essential vitamins and minerals. Any long-term mismatch between nutritional needs and intake can harm the body’s normal functions.
Malnutrition is broadly divided into undernutrition and overnutrition. Undernutrition develops when the body lacks sufficient energy, protein or micronutrients to maintain tissues, immunity and growth. It may cause weight loss, muscle wasting, fatigue, frequent infections and delayed physical or intellectual development in children. Overnutrition occurs when excessive calories or nutrients are consumed over time, often leading to obesity and metabolic disorders such as diabetes, heart disease and high blood pressure.
Types of malnutrition
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Undernutrition
– deficiency of calories, protein, vitamins or minerals due to poor intake, impaired absorption or increased nutritional needs.
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Overnutrition
– excessive intake of calories or nutrients, including unhealthy weight gain and, in rare cases, toxicity from supplements.
Malnutrition can affect people of all ages, but children, older adults, individuals with chronic illnesses and those with limited access to nutritious foods are particularly vulnerable. Importantly, malnutrition is not always visible — a person may appear overweight while still lacking essential micronutrients.
Main causes of malnutrition
• Unbalanced or insufficient diet, often linked to poverty, food insecurity or lack of nutritional knowledge.
• Medical and lifestyle factors, such as chronic disease, digestive disorders, sedentary habits, mental health conditions or improper use of supplements.
Diagnosis is based on dietary assessment, physical examination and, when needed, laboratory tests to identify nutrient deficiencies or excesses. Treatment depends on the type and severity of malnutrition and may involve dietary changes, nutritional supplementation, medical monitoring or long-term lifestyle support.
Preventing malnutrition starts with a varied, balanced diet that meets the body’s nutritional needs. Early recognition and appropriate intervention play a key role in reducing long-term health complications and improving overall quality of life.