Toddler Biomarker of Nutrition Study

This is a study of how accurate different methods to assess young children's dietary intake are, so that researchers and health professionals can better understand how children's nutrition relates to their health. The study will compare food surveys, measurements of nutrients in the blood, and optical measurements of nutrients in the skin.

Inclusion Criteria: * Healthy * 24 months of age * categorized by their guardian caregiver as either non-Hispanic white, Asian, Hispanic white, or non-Hispanic Black * participating guardian speaks, reads, and understands English. Exclusion Criteria: * metabolic, endocrine, or digestive condition, food intolerance, or food allergy * bleeding or clotting disorder * taking a medication or complementary alternative medicine that would interfere with fat absorption * taking a dietary supplement that provided more than 1 mg carotenoids per day * has a sibling that is participating or participated in the study.