This is a dangerous food myth that needs to be put into context. Eating for two doesn't mean doubling your calorie intake or consuming two full meals every time you eat. Although pregnant women do need to up their food intake, they only need about 300 extra calories per day. And an average healthy weight gain is considered to be within the range of 25 to 35 pounds. This could vary depending on your health and current weight, so always consult your doctor for more precise nutrition guidelines.