The usual scenario of treatment of pregnant women with diabetes, either gestational or pregestational is the coincidence of: 1) the difficulty that entails changing insulin sensitivity, 2) the importance of glycemic control that resembles as much as possible to that of healthy pregnant women, and 3) the willingness of the mother The latter circumstance makes it common that patients with type 1 diabetes and poor glycemic control have impeccable glycemic records during pregnancy and that women with gestational diabetes and unhealthy eating patterns, change them substantially during pregnancy. But the first two assumptions imply a major difficulty