Optimising Repeated Exposure: Determining Optimal Exposure Frequency for Introducing a Novel Vegetable among Children

Area of Science:

• Pediatric Nutrition
• Behavioral Science
• Food Acceptance Studies

Background:

• Low fruit and vegetable consumption is a significant public health concern in children.
• Developing effective strategies to increase vegetable acceptance is crucial for healthy dietary habits.
• Repeated exposure is a known method for enhancing food preferences.

Purpose of the Study:

• To investigate the impact of varying repeated exposure frequencies on children's acceptance of a novel vegetable (daikon).
• To assess the short-term and long-term effects of exposure on liking, familiarity, and intake.
• To determine if exposure frequency influences generalization to other vegetables.

Main Methods:

• One hundred fifty-nine 3-6-year-old children were divided into intervention groups with different daikon exposure frequencies (twice/week, once/week, once/bi-weekly) and a control group.
• Liking, familiarity, and intake of daikon and other vegetables were measured at baseline, post-intervention, and at 3 and 6-month follow-ups.
• Daikon intake was recorded during all exposure and testing sessions.

Main Results:

• All exposure frequencies, including the control group, showed significant increases in daikon liking and intake (p ≤ 0.05).
• Daikon intake increased up to the fourth exposure, after which a plateau was observed across all groups.
• No significant generalization effects to other vegetables were detected, but liking and intake of daikon persisted for 6 months.

Conclusions:

• Repeated exposure is an effective strategy for increasing liking and intake of novel vegetables in young children.
• All tested exposure frequencies were effective, and no specific frequency demonstrated superior results.
• Even minimal exposure to unfamiliar vegetables can lead to sustained improvements in acceptance over time.