Since during pregnancy you are eating for two it is recommended that a healthy weight woman increase her caloric intake by 300 calories per day. This should be done especially during the 2nd and 3rd trimester when the baby’s growth is the fastest. Note that 300 calories is not really much -- about one apple or even a doughnut. So make the right choices, choose healthy foods. If you do not eat enough calories, your baby could be born with a low birthweight, which puts your baby at risk for serious short-term and/or long-term health problems. Consult your doctor before and early during pregnancy to know the increased calorie recommendation for you.