But given human nature, microdoses of chocolate may be impractical, underscoring the difficulties of using nutrition to bolster fitness.

但是考虑到人性本质，食用微剂量的巧克力可能不大现实，这也了强调利用营养品来支撑人体健康是很困难的。

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One of the doctors used by US Postal, Michele Ferrari - nicknamed Doctor Death by reporters - found ways of helping to reduce the EPO glowtime by using small "microdoses" injected directly into the vein, Hamilton says.

BBC: Lance Armstrong: Tyler Hamilton on 'how US Postal cheated'