There is no definitive answer to this question as opinions vary among experts. Some say that the keto diet is safe for pregnant women, while others caution against it. The main concern with the keto diet during pregnancy is that it may cause ketosis, which is a state of high ketone levels in the blood. This can be harmful to the developing baby. Therefore, it is important to speak with a healthcare provider before starting the keto diet, particularly if you are pregnant.