Comment by amai

"He calculates that the ceiling for an 85-kilogram man would be about 4650 calories per day.

Speakman thinks that limit is too low, noting that cyclists in the Tour de France in the 1980s and ’90s exceeded it. But they were injecting fat and glucose directly into their bloodstreams, a practice Pontzer thinks might have helped them bypass the physiological limits on converting food into energy."

Is this really true, that cyclists are injecting fat and glucose directly into their bloodstreams? I can't believe that. I have never heard that before.