Malnutrition: A broad term for a range of conditions that hinder good health, caused by inadequate or unbalanced food intake or from poor absorption of food consumed. It refers to both undernutrition (food deprivation) and overnutrition (excessive food intake in relation to energy requirements). A deficiency in even a single nutrient can have catastrophic effect on a person’s health. Hunger is most often measured in terms of undernutrition.
Food Security: Exists when all people at all times have both physical and economic access to sufficient, safe and nutritious food that meets their dietary needs for a healthy life. Food Insecurity refers to conditions where people do not have physical and economic access to sufficient, safe, and nutritious food. Households or communities can be described as food insecure and so can nations.
Source: The Global FoodBanking Network