malnutrition

Poor nutrition because of an insufficient or poorly balanced diet or faulty digestion or utilization of foods.

Imperfect nutrition; defect of sustenance from imperfect assimilation of food.

Faulty or imperfect nutrition; inadequate or unbalanced food intake.

a lack of adequate nourishment

a state of poor nutrition; can result from insufficient or excessive or unbalanced diet or from inability to absorb foods