Malnutrition refers to poor nutrition, not just the lack of food, but also an unhealthy diet. Even with enough food, malnutrition can occur if the diet lacks essential vitamins.
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Global Issue
Understand that malnutrition is a global problem, not confined to the developing world. Obesity in developed countries can also be a form of malnutrition.
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Socio-Economic Factor
Malnutrition often involves social and economic issues, like poverty and healthcare access. Affluent societies may still have pockets of malnutrition among the less privileged.