Dietary assessment of pregnant women influences very strongly the fetus development and is very important for nutritional status of pregnant women after delivery. The aim of presented studies was the comparison of diet of women with different weight gain during pregnancy. In every trimester of pregnancy anthropometric measurement (height, weight, skinfolds thickness, body fat) were made. Depending on pre-pregnancy BMI (body mass index) weight increase during whole pregnancy was considered as correct, if was similar to recommendations of The Institute of Medicine of the National Academy of Science or wrong when was different from recommendations mentioned above. Dietary assessment was estimated by the 24 hour recall method. Energy intake, as well as intake of protein, carbohydrates, fatty acids and fiber was established for all women. There were examined 97 women, living in Krakow. Three times (in every trimester) were examined 27 women. There were 6 women with excess weight gain (two overweight, one obese, three with proper pre-pregnant BMI). The average weight gain was 15.4 kg (8.4-24.2 kg). The subcutaneous fat deposition did not change in pregnancy in group of women with excess weight gain because the skinfolds thickness did not change significantly. There were also no significant differences in dietary assessment of women with correct and incorrect weight gain. The average energy, protein, carbohydrates and fiber intakes were similar to nutritional recommendations for pregnant women. Fatty acids intake was excessive in both groups of examined women. Presented studies indicates that diet is only one from large number of factors which influences the pregnancy outcome.