Sauber driver Adrian Sutil has hit out at Formula 1's weight restrictions, revealing that he is not even carrying a water bottle during the races this season.
Weight has become a prominent issue in 2014 with heavier power units causing some teams to struggle to get down to the minimum weight, despite the figure of 691kg being an increase on 2013.
It is understood that Sauber is struggling to reach the weight limit, exacerbating the issue for a tall driver such as Sutil.
"We have to lose so much weight," he said of the taller drivers. "There is not much we can lose anyway, so we can't even train because we have to lose the small muscles. It is a difficult situation and I don't think it's fair.
"Small drivers can eat what they want but we are just naturally heavier and we get a penalty of half-a-second a lap, or more, just like that. Not because the smaller ones are better drivers, they are just lighter. That is not how it should be in Formula 1."
"No drinks bottles in the car is one thing. For Bahrain it'll one and a half hours in the car, no drink. In Malaysia I had a little bit of tea, but no more.
"There is a danger. We are driving more than 300km/h on the straight, so it's not so easy any more. You can't guarantee that every driver is 100 per cent from a physical point of view."
The German driver claims that such regulations are 'unfair' and that lighter drivers have blocked plans to amend the weight limit.
"The lightest drivers have a problem with it, they block it. I think it's unfair," he added. "I wouldn't like to win against a driver who is 20kg heavier. If you are here because of the sport because you want to win and be the best driver, this cannot be the case. This is not fair, this is not sport."