while you always want to check with your doctor there is no reason (i can see) that ensure would be unsafe to drink during pregnancy. i'm just not sure it's needed or appropriate to have frequently during this time though. ensure is a meal replacement given to individuals who have trouble getting enough nutrition and calories from food. it contains protein carbohydrates and fat with most the carbohydrates coming from sugar (22g) and it's fortified with vitamins and minerals. now if you are having trouble keeping food down or issues with gaining enough weight and this is an item you prefer then it might make sense. as i said just check with your doctor first. if you have a normal appetite and weight gain is fine it's best to get the nutrition you need from real food along with taking your prenatal supplement. that means plenty of fruits and vegetables whole grains lean protein sources low fat dairy and healthy fats. for more on what to eat during pregnancy see this webmd article <link>.
is it safe to drink ensure during pregnacy