On average, one scoop of whey protein provides ~25 grams of protein, which can supply almost 40% of a sedentary adult’s daily protein needs. However, how much whey protein per day depends on your body weight, activity level, and fitness goals.
To determine how much whey protein per day is right for you, you should first understand how much protein in general is needed to fit your needs. According to the RDA, it’s estimated that the average sedentary adult needs at least 0.8 g of protein/kg of body weight/day (g/kg/d), while an active adult should aim for 1.4-2.0 g/kg/d [1,2].
References
Lonnie, M., Hooker, E., Brunstrom, J. M., Corfe, B. M., Green, M. A., Watson, A. W., Williams, E. A., Stevenson, E. J., Penson, S., & Johnstone, A. M. (2018). Protein for Life: Review of Optimal Protein Intake, Sustainable Dietary Sources and the Effect on Appetite in Ageing Adults. Nutrients, 10(3), 360. https://doi.org/10.3390/nu10030360
Campbell, B., Kreider, R. B., Ziegenfuss, T., La Bounty, P., Roberts, M., Burke, D., Landis, J., Lopez, H., & Antonio, J. (2007). International Society of Sports Nutrition position stand: protein and exercise. Journal of the International Society of Sports Nutrition, 4, 8. https://doi.org/10.1186/1550-2783-4-8
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