Nausea and vomiting in pregnancy (NVP) is a common symptom. Although the influence of NVP during the first trimester on dietary intake and birth outcomes has been revealed, no study has focused on NVP during the second trimester. This study aimed to reveal whether NVP severity during the second trimester is associated with dietary intake, gestational weight gain (GWG), birth weight, and delivery week. Participants completed a questionnaire at 18–27 gestational weeks. NVP severity was assessed using the modified Pregnancy-Unique Quantification of Emesis and Nausea scale in the questionnaire. Dietary habits were assessed using a brief-type diet history questionnaire. In total, 825 responses were analyzed: 202 (24.5%), 135 (16.4%), and 8 (1.0%) women reported mild, moderate, and severe NVP, respectively; 480 (58.2%) women did not have NVP during the second trimester. No significant association was observed between energy and nutrient intake and no/mild and moderate/severe NVP. Women with moderate/severe NVP had lower total GWG than those with no/mild NVP (p = 0.007). There was no significant difference in low birth weight and preterm birth rates (p = 0.246 and p = 0.604). This is the first study to investigate whether NVP severity during the second trimester is associated with dietary intake and birth outcomes.

Background/Objectives: Glucose and lipid metabolism during pregnancy are crucial for perinatal outcomes. Recently, chrono-nutritional factors have been partially identified as influencing pregnancy metabolism. This study aimed to investigate overnight fasting duration and meal frequency during pregnancy and to clarify their associations with glucose and lipid metabolism. Methods: This cross-sectional study was conducted at a university hospital in Tokyo, Japan, between February 2020 and June 2021. A self-administered questionnaire was used to evaluate overnight fasting duration and meal frequency in 144 pregnant women in their second trimester. Nutrient intake was assessed using the brief-type self-administered diet history questionnaire. Non-fasting blood samples were collected and analyzed for levels of total cholesterol, triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and glycated albumin. Results: The mean ± standard deviation of overnight fasting duration was 12.1 ± 1.5 h, meal frequency was 3.8 ± 0.9 times per day, and glycated albumin level was 13.3 ± 1.0%. Multivariate analysis revealed that a longer overnight fasting duration was significantly associated with lower glycated albumin levels (β = −0.167, p = 0.030). Conclusions: These findings suggest that, in addition to meal content and quantity, overnight fasting may be effective in appropriately managing glycated albumin levels during the second trimester of pregnancy.