When male runners push themselves to exhaustion during intense exercise, their blood levels of zinc and copper go up right away—even when they eat the same foods—showing it's the body's natural reaction to hard workouts.

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Pro

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Against

Evidence from Studies

Supporting (1)

21

Community contributions welcome

21

Acute exercise effects on urinary losses and serum concentrations of copper and zinc of moderately trained and untrained men consuming a controlled diet.

Cross-Sectional Study

Human

1995 Mar

The study shows that after intense exercise, zinc and copper levels in the blood go up right away for both trained and untrained runners, just like the claim says, and this happens even when their diet is controlled.

Contradicting (0)

0

Community contributions welcome

No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Acute exercise effects on urinary losses and serum concentrations of copper and zinc of moderately trained and untrained men consuming a controlled diet.

Score: 21

DOI: 10.1039/AN9952000867

Similar Assertions

After a hard workout, the levels of copper and zinc in the blood go up the same way for both fit and not-so-fit male runners, even though their fitness levels are different.

21

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93%

After hard exercise, zinc levels in runners' blood drop lower than before they started, and this happens even in people who don't exercise much, which might mean their bodies react slowly or lose zinc.

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21

89%

When male runners do a short, hard workout, the amount of zinc and copper they lose in their pee doesn't really change much.

21

0

81%