[M5Rick]

2016 champ Rosberg probably knows Lewis's weaknesses on and off the track more than anyone else and he's the only driver to have beaten him lately (in '16).
He's opened up in an attempt to help other drivers catch up to the Stevenage born driver in saying when things don't work out for him he can be on a downer for two maybe three races to 'recover' in which time others have failed to realise they can seize the opportunity when this happens.
I believe he has changed diet to vegetarian, lifestyle also so whether this is still the case remains to be seen.