True or False: A woman with a BMI of 30 will need to gain less weight than a woman with a BMI of 20 when pregnant.

The assertion that a woman with a BMI of 30 will need to gain less weight than a woman with a BMI of 20 during pregnancy is false.

Pregnant women are advised to gain varying amounts of weight depending on their pre-pregnancy body mass index (BMI). Those with a lower BMI, such as 20, are typically encouraged to gain more weight during pregnancy to support the healthy growth and development of the fetus. On the other hand, women with a higher BMI, like 30, are generally advised to gain less weight to reduce the risks associated with overweight or obesity during pregnancy, such as gestational diabetes and hypertension.

Therefore, the statement simplifies a complex issue and does not account for standard recommendations that suggest weight gain should be appropriate to the woman's BMI category prior to pregnancy.