A lack of adequate nourishment.
Inadequate nutrition, either due to a lack of food, or to the inability of the body to absorb its nutrients
Faulty or imperfect nutrition; inadequate or unbalanced food intake.
a state of poor nutrition; can result from insufficient or excessive or unbalanced diet or from inability to absorb foods
Malnutrition is a condition that results from eating a diet which does not supply a healthy amount of one or more nutrients. This includes diets that have too little nutrients or so many that the diet causes health problems.