Any condition caused by poor diet or the inability of the body to use certain nutrients.

A nutrition disorder is caused by poor diet or an inability of the body to use certain nutrients. Examples include:

• Overnutrition leading to overweight or obesity.
• Undernutrition leading to weight loss.
• A vitamin or mineral deficiency.

Symptoms of nutrition disorder can include being overweight or underweight. Anemia, fatigue and changes to the skin, hair or nails also can be caused by nutrient imbalances.

Nutrition education is important for the treatment of all forms of nutrition disorders. Behavior changes and a healthy diet can help treat overnutrition or undernutrition. For those with a known deficiency, a healthcare professional may suggest vitamin and mineral supplements to help balance nutrients.