“A pregnant woman eats for two.”

The notion that a pregnant woman must "eat for two" is a widely recognized saying, often leading expectant mothers to believe they need to double their food intake. This common misconception has likely persisted through generations, rooted in a well-meaning but ultimately inaccurate understanding of the body's needs during pregnancy. It may have been considered sound advice in earlier times, perhaps when nutritional deficiencies were more prevalent or when less was understood about precise caloric requirements.

However, scientific evidence clearly busts this myth. While a pregnant woman does require additional energy to support her growing baby, it is not nearly double the normal amount. In the first trimester, generally no extra calories are needed. As pregnancy progresses, the recommendation typically increases to about 340 additional calories per day in the second trimester and around 450 extra calories daily in the third trimester, depending on individual factors like pre-pregnancy weight and activity level. These modest increases are far from eating for an entire second adult.

The belief in eating for two endures partly because it "kind of makes sense" and can be appealing, offering a perceived justification for indulging cravings. Strong social norms and a lack of precise knowledge about actual caloric needs also contribute to its longevity. Unfortunately, adopting this myth can lead to excessive gestational weight gain, which carries several health risks for both mother and baby, including an increased likelihood of gestational diabetes, high blood pressure, and a higher infant birth weight. Instead of doubling portions, the focus should be on nutrient-dense foods to ensure both mother and baby receive essential vitamins and minerals without unnecessary excess.