If a pregnant woman has been diagnosed with gestational diabetes, she needs to be very careful about her diet. Whether to drink full-fat or skim milk during pregnancy depends on the individual's caloric needs. Considering the different amounts of calories produced by fats and proteins, skim milk generally has lower calories. Therefore, a pregnant woman with gestational diabetes can drink skim milk, but she should also be cautious about the total amount of milk consumed. She should not drink too much at once or consume milk excessively, because both full-fat and skim milk can lead to a significant increase in blood sugar levels.