Variations in cereal volume affect the amount selected and eaten for breakfast

Area of Science:

• Nutrition Science
• Human Nutrition
• Food Science

Background:

• Food volume and portion size are key factors in energy intake.
• The impact of food piece size on consumption has been under-researched.
• Understanding these factors is crucial for dietary management.

Purpose of the Study:

• To investigate how food volume, manipulated by changing cereal flake size, affects portion selection and energy intake.
• To determine if participants accurately estimate calorie content when food volume varies.
• To quantify the relationship between reduced food volume and increased energy consumption.

Main Methods:

• A crossover study involving 41 adults consuming different volumes of wheat cereal over 4 weeks.
• Cereal flake size was systematically reduced, decreasing volume to 80%, 60%, and 40% of the standard.
• Participants self-selected portions of cereal by weight and consumed ad libitum.

Main Results:

• Reducing cereal flake size led to smaller poured volumes but greater weight and energy content.
• Participants consumed significantly more energy as cereal volume decreased (34% increase).
• Calorie estimations remained similar across different cereal volumes, indicating misperception.

Conclusions:

• Food piece size significantly influences portion size and subsequent energy intake.
• Decreasing food volume can lead to increased calorie consumption without perceived changes in intake.
• Dietary interventions should consider food structure and volume to manage energy balance.