You need moderate amounts of fat in your diet for you and your growing baby. (medlineplus.gov)
Most people do best with moderate amounts of both fat and carbs, and most conventional meals / diets also tend to have moderate amounts of either. (straightforwardfatloss.com)
It's a pretty simple philosophy: alternate low and high quantities of carbohydrates on different days, while eating adequate protein intake and moderate amounts of fat in the diet. (fitnessandpower.com)