The consumption of protein and fiber‐matched beef vs. soy lunch meals on appetite control, satiety, and subsequent food intake in healthy adults (381.3)

Abstract

Background: Although the satiety effects of protein quantity are well‐documented, the effects of protein quality (source) on satiety are limited. Purpose: To examine the effects of consuming beef vs. soy‐based protein foods on appetite control, satiety, and subsequent food intake. Methods: Using a randomized, crossover design, 23 healthy adults (age 23 ± 1 y; BMI: 23.4 ± 0.6 kg/m2) consumed, on separate days, 400 kcal lunch meals that were identical in protein (24 g), CHO (44 g), fat (11 g), and fiber (2 g) content but varied in protein source, with one containing beef protein (BEEF) and one containing soy protein (SOY). Pre and post‐lunch appetite questionnaires and repeated blood samples were collected throughout the day until dinner was voluntarily requested. An ad libitum dinner was provided. Results: The consumption of BEEF led to increased post‐lunch fullness vs. SOY (p<0.05) but had no effect on post‐lunch ghrelin, PYY, and GLP‐1 concentrations. Dinner was voluntarily requested at 260 ± 15min post‐lunch with no differences observed between the BEEF vs. SOY lunch meals. Lastly, no differences in dinner energy or macronutrient content were observed following the BEEF vs. SOY lunches. Conclusions: When comparing two high quality protein sources, such as beef and soy, the type of protein consumed within a mixed‐meal elicited very little effect on appetite control, satiety, and subsequent food intake in healthy adults.Grant Funding Source: Supported by The Beef Checkoff