Last time we heard from Xavi, he had just finished a marathon after three days of fasting.
In that experiment, he avoided cramps by taking in electrolytes in coconut water. But coconut water contains sugar as well, and he wondered if the glucose kept him going.
This time, he consumed only distilled water, while working and exercising. It was a disaster.
Fascinating to see how his body raised the alarm as the Brain Fuel gauge neared E.
He lost four kilograms during the fast, then gained six after.