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Effects of Dietary Protein Quantity and Source in Appetite Responses in Energy‐Restricted Overweight and Obese Adults
Author(s) -
Li Jia,
Armstrong Cheryl,
Campbell Wayne
Publication year - 2015
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.29.1_supplement.594.8
Subject(s) - appetite , overweight , meal , obesity , weight loss , medicine , zoology , endocrinology , food science , biology
Weight loss is pivotal for improving obesity‐related comorbidities. Under ad libitum conditions, high‐protein diets reportedly aid weight loss partially by sustaining satiety. However, it is not clear during energy restriction (ER), how 1) protein quantity across the acceptable macronutrient distribution range (AMDR) and 2) predominant protein source affect appetitive responses in overweight/obese adults adapted to such diets. In this study, 23F/11M overweight/obese adults (age 蠅21y, BMI 30.8±0.4 kg/m 2 ) were randomly assigned to two groups with either lean pork/beef or soy/legume as the predominant protein source (30% total protein). Each subject consumed ER diets (‐750 kcal/d) containing 10%, 20%, or 30% energy from protein for 3 consecutive 4‐wk trials (in random order). At the end of each trial, perceived appetite ratings (fullness, hunger, and desire to eat) were measured using visual analog scales (0‐100mm) under free‐living (days 25‐27, waking hours) and in‐lab (day 28, for 4 hours post‐breakfast consumption) conditions with all foods and breakfast provided, respectively. Neither protein quantity nor predominant protein source affected appetite ratings, with the exception that during the 30% protein trial daily fullness was higher than during the 10% trial (areas under the curve: 638±45 vs. 582±43 mm*13h, P <0.05). Our results suggest that protein quantity within the AMDR, regardless of predominant source, has a minimal impact on daily and meal‐specific appetite during weight loss. Support: National Cattleman's Beef Assoc.; National Pork Board; NIH UL1TR001108.