The Real Science of Sport Podcast Unpacking The Truth Behind Exercise and Protein Supplementation
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Oct 11, 2022 
Protein gets the sports-science spotlight as Professor Stuart Phillips joins the discussion on athlete needs, recovery, and whether supplements deliver much beyond a solid diet. They also explore plant versus animal protein, myths about kidney and cancer risks, and why exercise becomes especially important for preserving muscle with age. Elsewhere, scandals in fishing, boxing, cycling, and chess show that cheating can surface in almost any sport.
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Protein Is A Structural Substrate Not Fuel
- Protein is fundamentally structural, not primarily fuel, so daily intake supplies essential amino acid 'bricks' for muscle, bone, enzymes and repair.
- Unlike carbs/fat you cannot store protein, so continuous intake matters to replace turnover.
Target 1.6 Grams Per Kilogram For Athletes
- Aim for about 1.6 grams protein per kilogram bodyweight per day rather than the RDA 0.8 g/kg to cover most endurance and resistance athletes.
- Higher intakes are absorbed but unused nitrogen gets excreted as urea, so extra intake is wasteful past needs.
You Can Absorb Plenty But You Can't Store Protein
- The body will absorb very large amounts of protein but cannot store excess; surplus protein is deaminated and nitrogen excreted as urea.
- Practical consequence: eating far above needs doesn't build extra muscle — the extra is lost.