Trying to diet even in the slightest way during pregnancy is not smart. Remember that weight recommendations have changed since your mother and grandmother's time. Today, the American College of Obstetricians and Gynecologists and the National Academy of Sciences' Institute of Medicine consider a healthy weight gain during pregnancy to be between 25 and 35 pounds. These numbers may vary depending on your pre-pregnancy weight, your metabolism and your level of activity. Follow your health care provider's recommendations.
Experts agree that a steady weight gain throughout pregnancy is best.
Remember, it's more important to pay attention to how well you're eating for two, rather than worrying about precisely how much, or how little weight you're going to gain. Think in terms of eating a full and well balanced diet, smart snacking and a sensible exercise routine that suits you. Pregnancy and Exercise Medical experts can't say enough good things about exercising during pregnancy. Women who exercise during pregnancy have reduced weight gain, more rapid weight loss after pregnancy, more positive attitudes and spirits, and sleep better at night. It's worth noting that a sensible exercise routine does not increase your risk of miscarriage.