During pregnancy, a woman needs to consume an additional 500 calories per day to support her growing baby. She should eat a balanced diet containing protein, fat, and carbohydrates from foods like meat, dairy, grains, fruits and vegetables. Key vitamins and minerals include folic acid, iron, calcium and zinc, which are essential for the baby's development. A woman's weight gain during pregnancy should be between 10-12kg, with most of the extra weight coming from the baby, placenta, amniotic fluid and increased stores of blood and fat.