To investigate the differences in food intake in older adults that are more or less active and assess any differential responses to protein intake.~To compare the effect of meals with high or low protein level but equal in energy and volume on appetite and gastric emptying in older adults that are more or less active (≥ 65 years).
This study aims to assess the effect of protein on appetite, food intake and gastric emptying in older adults (≥ 65 years) that are more and less active.