Professional footballers have two key responsibilities throughout their careers: maintaining fitness and a healthy diet.
The latter is particularly important, with regard to eating and drinking all the right products to give the body the nutrition and energy it needs to play, train and recover.
So vital is a healthy diet, in fact, that elite clubs monitor their players to make sure they ascertain to their strict dietary requirements.
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Cristiano Ronaldo is the prime example of a player who trains hard and eats well to ensure his body is able to cope with the rigours of professional football.
Believe it or not, though, there was once a time when the Portuguese wasn't so mindful about his diet.
In an interview with retired footballer and self-proclaimed entrepreneur Jan Aage Fjortoft, ex-Manchester United striker Ole Gunnar Solsjkaer recalled a time when Ronaldo arrived to breakfast drinking a coke.
The Norwegian continued to reveal that Ryan Giggs reacted rather angrily.
He said: "Ronaldo came once to a breakfast with a coke in his hands. Giggs pushed him on the wall and said: 'Don't ever do that again!'"
Brutal. Solskjaer's version of the story might be a bit exaggerated, but considering how competitive professional footballers are, you wouldn't put it past Giggs to have blasted Ronaldo.
Perhaps it was just the Welshman's way of teaching his Portuguese teammate an important lesson - after all, Giggs knew from the moment he saw Ronaldo play for the first time that he was destined for greatness.
Ahead of Portugal's win over France in the Euro 2016 final earlier this month, he said: "You see Ronaldo get the ball, and you see him turn John O'Shea inside out, and you're having a little giggle to yourself.
"He just lit up the game, all the lads were talking to him after the game and I remember we were waiting on the coach and everybody was wondering what we were waiting for.
"And then we just got a little whisper that the deal was being done for £13 million."
The rest is history.