The Claim

Excessive protein intake exceeding 2.0–2.2 grams per kilogram of body weight per day increases metabolic burden on the liver and kidneys and contributes to hyperuricemia and elevated urinary microalbumin without enhancing athletic performance.

Source: Research on Protein Intake for the Recovery of Athletes in Different Sports

What the research says

Roughly balanced

Support and challenge are close. The picture may shift as more studies come in.

Supports
1score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Consuming more than 2.0–2.2 grams of protein per kilogram of body weight daily increases stress on the liver and kidneys, raises uric acid levels in the blood, and increases microalbumin in urine, without improving athletic performance.

See the scientific wording

Excessive protein intake exceeding 2.0–2.2 grams per kilogram of body weight per day may increase metabolic burden on the liver and kidneys, potentially contributing to hyperuricemia and elevated urinary microalbumin, without enhancing performance in athletes.

Why this might work

When too much protein is eaten, the liver breaks down the extra amino acids and turns them into urea and uric acid, which the kidneys must filter out. This forces the kidneys to work harder, increasing pressure inside their filtering units and causing small proteins to leak into the urine. The body also produces more uric acid as a byproduct, which builds up in the blood. All this happens without making athletes stronger or faster.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Research on Protein Intake for the Recovery of Athletes in Different Sports

    This study says that eating more than 2.2 grams of protein per kilogram of body weight doesn’t make athletes stronger or faster, and might put extra strain on their kidneys and liver. So, eating extra protein beyond that point doesn’t help — and could hurt.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.