What are short term effects of not eating enough?

Short-term effects of not eating enough (undereating or malnutrition) can include:

- Low energy levels and fatigue

- Difficulty concentrating and impaired cognitive function

- Irritability and mood changes

- Headaches

- Dizziness and lightheadedness

- Constipation

- Stomach pain, nausea and vomiting

- Dry skin, hair and nails

- Muscle weakness and cramps

- Slowed heart rate and low blood pressure

- Reduced immune function making one more susceptible to infections

- Menstrual irregularities in women

- Impaired fertility in both men and women

- Sleep disturbances

- Feeling cold all the time due to decreased metabolism

- Reduced tolerance to physical and mental stress