Introduction
Protein supplementation has become increasingly popular among athletes, fitness enthusiasts, and individuals aiming to improve their health and physique. However, myths and misconceptions about protein intake persist, leading to confusion. The recent publication by Antonio et al. (2024) in the Journal of the International Society of Sports Nutrition addresses these concerns, providing evidence-based answers to common questions. In this article, we summarize their findings, structuring the discussion by the item numbers from the research article.
Antonio, J., Evans, C., Ferrando, A. A., Stout, J. R., Antonio, B., Cinteo, H., Harty, P., Arent, S. M., Candow, D. G., Forbes, S. C., Kerksick, C. M., Pereira, F., Gonzalez, D., & Kreider, R. B. (2024). Common questions and misconceptions about protein supplementation: what does the scientific evidence really show?. Journal of the International Society of Sports Nutrition, 21(1), 2341903. https://doi.org/10.1080/15502783.2024.2341903
1. Does high protein intake harm the kidneys?
One of the most pervasive myths is that high protein intake damages renal function. Antonio et al. (2024) dispel this concern, noting that studies in healthy individuals have consistently shown no adverse effects on kidney function from consuming up to 3.0 g/kg/day of protein. However, those with pre-existing kidney disease should consult healthcare professionals before increasing protein intake.
2. Does protein supplementation lead to bone loss?
Contrary to the belief that protein increases calcium excretion and weakens bones, evidence reveals that protein intake positively affects bone health. This research article highlights that protein enhances calcium absorption and supports bone density, especially when combined with adequate calcium and vitamin D.
3. Is there a limit to how much protein the body can absorb in one meal?
The idea that the body can only absorb 20-30 grams of protein per meal is misleading. While protein synthesis rates may plateau at around 20-40 grams depending on body size and training status, protein absorption is not limited. Excess protein can be metabolized or used for other bodily functions.
4. Does timing of protein intake matter?
Nutrient timing is often emphasized in sports nutrition, but this article suggest that total daily protein intake is more important than precise timing. That said, consuming protein post-exercise can enhance muscle protein synthesis. We often recommend higher protein earlier in the day for those with chronic fatigue or who struggle to have enough energy to support activities during the day, because higher protein keeps cortisol levels higher for better energy.
5. Do older adults require more protein?
Age-related muscle loss (sarcopenia) increases protein needs in older adults. Antonio et al. recommend 1.2-2.0 g/kg/day for older individuals to preserve muscle mass and strength, emphasizing that higher protein diets are particularly beneficial for aging populations. For women, perimenopause and beyond often feel better from a higher protein intake.
6. Is whey protein superior to other protein sources?
Whey protein is often touted for its rapid absorption and high leucine content, which optimally stimulates muscle protein synthesis. However, this research article asserts that other protein sources, including casein, soy, and plant-based proteins, can also be effective when consumed in adequate amounts. Not all individuals tolerate whey, so brands such as So Lean & So Clean by Ora Organics is a good plant-based protein powder available in Fullscript.com. Another favorite in our household is Ka’Chava super-food blend which has 25g of protein.
7. Does protein supplementation lead to weight gain or fat gain?
Protein supplementation alone does not inherently cause weight gain. Overall caloric balance, inflammation, electrolyte balance, and other factors can lead to weight changes. Protein can aid in weight management by promoting satiety and preserving lean mass.
8. Can vegetarians and vegans meet protein needs with plant-based sources?
Yes, plant-based diets can provide sufficient protein (think: minimums here) when appropriately planned. Combining complementary proteins (e.g., rice and beans) ensures a complete amino acid profile. That said, you would need to eat 6 cups of quinoa (a complete protein) to equal the amino acid profile of a piece of chicken (also a complete protein). Certain conditions warrant higher than minimum amounts of protein – examples include chronic fatigue, recovery from surgery or injury, mental health, menopause, and others. Most clients we work with feel better well above the minimum intake of protein. Supplementing with plant-based protein powders is a practical option to bump up protein intake.
9. Are protein supplements necessary for everyone?
While whole foods are ideal, protein supplements offer convenience. Supplements are beneficial for individuals with high protein requirements or limited access to high-protein foods. You may have heard that collagen is not a complete protein and thought that maybe you can’t “count” that in your overall protein intake totals. It is not a complete protein, but neither are beans or rice and we count all of these incomplete proteins, because they contribute to an overall intake of all amino acids needed.
10. Does protein quality matter?
Protein quality is determined by its amino acid composition and digestibility. Antonio et al. highlight that animal proteins generally score higher on the Protein Digestibility-Corrected Amino Acid Score (PDCAAS) and Digestible Indispensable Amino Acid Score (DIAAS). However, blending plant proteins can achieve similar effects.
11. Is protein supplementation necessary immediately after exercise?
Immediate post-exercise protein consumption is less critical than total daily intake. Antonio et al. note that a post-exercise meal containing protein within a few hours is sufficient for recovery and adaptation.
12. Can high protein intake cause dehydration?
The notion that protein causes dehydration stems from increased urea production, which requires water for excretion. However, Antonio et al. found no evidence of dehydration in individuals consuming high-protein diets, provided adequate fluid intake is maintained.
13. Does protein intake affect liver function?
Healthy individuals do not experience liver dysfunction from high protein intake. Antonio et al. confirm that liver enzyme levels remain within normal ranges even with elevated protein consumption.
14. Are branched-chain amino acids (BCAAs) necessary if protein intake is sufficient?
BCAAs (leucine, isoleucine, and valine) are marketed for muscle growth, but Antonio et al. argue that consuming sufficient complete proteins renders additional BCAAs unnecessary. Whole protein sources already supply ample BCAAs.
15. Can protein supplementation improve recovery and performance?
Protein aids in muscle repair and growth. Antonio et al. report that consistent protein intake supports recovery, enhances strength gains, and prevents muscle loss during caloric restriction.
Food Sources
- Egg 6g
- Egg White 4g
- Collagen 10g
- Low Sodium 5-6 slices high quality lunchmeat 30-35g
- Chicken Sausage (3) – 9-11g
- Nuts/Seeds – 1/4 cup 5-7g pro
- Protein powder – 15g – 25g
- Fage Yogurt 2% 18g
- Meat / Poultry 3 ounces ~22g
- Beans ~6g
- Cheddar Cheese 1 ounce 7g
I hope you found this research summary of the evidence helpful in debunking common protein supplementation myths and clarifying best practices. For most individuals, protein is a safe, effective, and versatile nutrient supporting muscle health, metabolic function, and overall well-being. We tailor protein intake to individual needs and preferences remains key, whether through whole foods, supplements, or a combination of both.
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