Protein supplements and weight gain
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Protein Supplements and Muscle Mass Gain
Research consistently shows that protein supplementation can help increase muscle mass, especially when combined with resistance or endurance training. Multiple studies have found that protein supplements significantly enhance gains in lean body mass (LBM) and fat-free mass (FFM) in both healthy adults and older populations, as well as in those undergoing specific training programs or recovering from surgery Morton2017Bell2017Lin2020+5 MORE. The effect is most pronounced when the training stimulus is adequate in terms of frequency, volume, and duration .
Protein Supplements and Strength Improvements
Protein supplementation also leads to greater improvements in muscle strength, particularly when paired with resistance exercise training. Studies show that both untrained and trained individuals can experience increased strength with protein supplementation, although the effect is more significant as training continues over time Morton2017Bell2017Tieland2012+1 MORE. In older adults, protein supplements can increase strength, and these gains are further enhanced when combined with exercise Bell2017Tieland2012.
Protein Supplements and Body Composition
Protein supplementation not only increases muscle mass but can also positively affect body composition by increasing lean mass and reducing fat mass. In healthy adults and older individuals, supplementing with protein leads to measurable increases in LBM and reductions in fat mass, even without significant changes in BMI Ranjbar2025Lin2020Wirth2020+1 MORE. For those who have undergone bariatric surgery, protein supplementation can help preserve muscle mass and reduce fat mass, although it may not significantly change BMI or overall lean body mass .
Protein Intake Amounts and Timing
The benefits of protein supplementation appear to plateau at a certain intake level. Consuming more than about 1.6 grams of protein per kilogram of body weight per day does not provide additional gains in muscle mass during resistance training . Additionally, the timing of protein intake (such as consuming protein at breakfast or lunch) does not seem to make a significant difference in muscle mass or strength gains, as long as total daily protein intake is sufficient Wirth2020Norton2015.
Protein Source: Animal vs. Plant-Based
The type of protein—whether animal-based (like whey) or plant-based (like soy)—does not significantly affect gains in muscle mass or strength when combined with resistance training. Both sources are effective for supporting muscle growth and strength improvements .
Special Populations: Older Adults and Frail Individuals
Older adults and frail elderly people benefit from protein supplementation, especially when combined with resistance-type exercise. Protein supplements help preserve or increase lean tissue mass and muscle strength, which are important for maintaining mobility and independence with age Bell2017Tieland2012Wirth2020+1 MORE. However, the positive effects of protein supplementation on muscle mass tend to decrease with increasing age .
Protein Supplements and Endurance Training
Protein supplementation can also enhance adaptations to endurance training, leading to greater improvements in aerobic capacity, lean mass, and exercise performance compared to endurance training alone Lin2020Pasiakos2014.
Conclusion
Protein supplementation is effective for increasing muscle mass, improving strength, and enhancing body composition, especially when combined with regular exercise. The benefits are seen across various age groups and training backgrounds, and both animal and plant-based protein sources are effective. However, consuming protein beyond recommended levels does not provide extra benefits, and the timing of intake is less important than total daily protein consumption. Protein supplements are particularly valuable for older adults and those seeking to maximize the effects of resistance or endurance training.
Sources and full results
Most relevant research papers on this topic
Protein supplementation increases adaptations to endurance training: A systematic review and meta-analysis.
Protein supplementation during endurance training enhances aerobic capacity, stimulates lean mass gain, and improves time trial performance in healthy and clinical populations.
No Difference Between the Effects of Supplementing With Soy Protein Versus Animal Protein on Gains in Muscle Mass and Strength in Response to Resistance Exercise.
Soy protein supplementation produces similar gains in strength and lean body mass in response to resistance exercise training as whey protein.
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