Parents of young participants participating in general assessment 1A (“Baseline”) received four questionnaires:

• 1A General Questionnaire
• 1A Birth Questionnaire
• 1A Behavior Questionnaire
• 1A Food Questionnaire

The 1A Food Questionnaire contained the following sections and subsections:

• Personal data

• Children's diet (FFQ-TNO)
• Children's diet (general)