Sutil claims he is barely training in order to further shrink his muscles, and eating and drinking so little that - tapping his head - "you don't work well up here".
Not only that, Sauber's car and Ferrari engine are both overweight, so the Swiss team is cutting corners in every area -- including taking away Sutil's half-kilo drinks bottle.
But Ferrari's super-fit cycling enthusiast Fernando Alonso has revealed that, even in stifling Malaysia, he raced comfortably without a drink.
"In the past, Malaysia required a specific training programme," he said in Bahrain.
"But this year I told the team I didn't even need a drinks system. The cars are much less physically demanding."