Compensation for Smaller Portion Sizes and Portion Size Normality

"Smaller than normal portion size - the intervention is the meal size perceived as 'smaller than normal' that participants are provided with during a lunchtime session in the laboratory.~'Small-normal' portion size - the intervention is the meal size perceived as 'small normal' that participants are provided with during a lunchtime session in the laboratory.~'Large normal' portion size - the intervention is the meal size perceived as 'large normal' that participants are provided with during a lunchtime session in the laboratory."