This study was approved by the Ethics Committee of Chiba University, Japan. Data of participants (age, body mass index [BMI], and a number of deliveries) and FFQ were completed by mothers (n = 1716) and fathers (n = 318) recruited from the Chiba Regional Center, which is one of the 15 regional centers of JECS. Age, BMI, and reproductive information were collected from medical record information. Participants who had completed <60% of the FFQ, outlier of energy intake (below 600 kcal/day or above 4000 kcal/day), and not completed the medical record information (age, BMI, and reproductive information) were excluded from the analysis. Finally, the remaining 1477 mothers (86.1%) and 219 fathers (68.9%) were used for all analysis (Table 1).Table 1Subjects’ characteristics, FFQ data in fathers and mothers recruited in Chiba Regional Center of JECSMothers (n = 1477)Fathers (n = 219)MeanStandard deviation0%25%50%75%100%MeanStandard deviation0%25%50%75%100%Age31.05.017.028.031.035.046.032.96.020.029.032.037.064.0BMI21.43.214.619.220.722.739.924.43.916.921.923.826.239.0Height158.25.4140.0155.0158.0162.0178.0171.45.7158.0167.3171.5175.0190.0Weight53.58.937.048.052.057.0106.071.812.347.363.070.078.7110.0A number of deliveries0.90.80.00.01.01.05.0Energy (kcal)18455836851426175821533973220862510561756215825933920Intakes of foods (g/day/kcal)Eggs15.413.10.07.613.319.6194.315.720.40.05.810.718.3145.9Fats and oils6.02.41.24.35.67.226.35.43.90.03.04.56.936.5Fish and shellfish22.115.00.012.420.028.8154.822.018.50.08.017.630.8119.8Fruits89.170.50.039.674.8121.7740.253.271.40.010.333.372.3548.1Meats38.919.50.025.236.149.0143.948.636.80.023.939.760.2241.0Milks138.8126.20.059.6108.6171.2914.594.3163.20.016.445.496.71315Potatoes and starches13.99.50.07.312.118.489.411.011.00.03.68.414.788.5Vegetables106.062.70.064.191.4133.8829.082.178.50.034.457.2110.4492.9Water217.7313.90.022.197.1286.02386174.5322.70.022.368.8215.43585