Cultural practices may mean that not everyone in a family gets a fair share of the food available. Other substances in foods . Very high intakes of some substances, for example fibre, reduce absorption of some nutrients from food. Medical conditions . Some may affect food intake or the absorption of nutrients from foods.
Some medicines affect appetite.
Psychological problems . Some may affect food intake. Unusual dietary habits . Some types of malnutrition are relatively easy to prevent. One strategy is to fortify commonly eaten foods.