Impact of Whey Protein Supplementation in a Weight-Loss Intervention in Rural Dwelling Adults: A Feasibility Study
John A. Batsis Clin Nutr July 23, 2021
Background & Aims
Weight loss in older adults enhances physical function, but may lead to sarcopenia and osteoporosis. Whey protein is a low cost rich source of essential amino acids, may improve physical function. We evaluated the feasibility and acceptability of consuming whey protein in the context of a weight-loss intervention in older adults with obesity.
Methods
A 12-week pilot feasibility, non-randomized weight loss study of 28 older adults was conducted, consisting of individualized, weekly dietitian visits with twice weekly physical therapist-led group strengthening classes. Half consumed whey protein, three times weekly, following exercise. Preliminary efficacy measures of body composition, sit-to-stand, 6-minute walk and grip strength and subjective measures of self-reported health and function were also evaluated.
Results
Of the 37 enrolled, 28 completed the study (50% in the protein group). Attendance rates for protein vs. non-protein groups were 89.9±11.1% vs. 95.6±3.4% (p=0.08). Protein consumption was high in those attending classes (90.3%) as was compliance at home (82.6%). Whey was pleasant (67.3±22.1, range 30-100, above average), had little aftertaste, and was neither salty or sticky. All were compliant (0.64±0.84, range 0-5, low = higher compliance). Both groups lost significant weight (protein vs. no protein, -3.45±2.86 vs. -5.79±3.08, p=0.47); Sit-to-stand, six-minute walk, and gait speed were no different, grip strength was improved in the protein compared to the non-protein group (-2.63 kg vs. 4.29 kg; p<0.001).
Conclusions
Our results suggest that whey protein is a low-cost and readily available nutritional supplement that can be integrated into a weight loss intervention.