Tottenham boss Antonio Conte insists he'll know if his players have been cheating on their diet.
The Italian has immediately implemented a ketchup and pizza ban at Hotspur Way after being appointed boss earlier this month.
And he has warned that the club nutritionist will help him discover any players that aren't playing by the rules.
He said: "I can see the results from the nutritionist and I can see if this is okay or not okay and maybe you are not doing well outside the training centre.
"This is a part of it, to improve the players in many aspects and to make the players understand. The pitch and the game is only the final part of your work.
"You have to prepare your body and your mind. Also, your heart and your passion to do this.
"I did this not only at Chelsea and Juventus and Inter Milan, but also when I was in Serie B with Siena.
"I was the same because I think I had an important experience as a player and I am trying to bring this into my coaching and my relationships with the players.
"I consider a good nutrition and attitude very important because for the player it is not only important the training or the game. I think you have to prepare yourself in the best possible way.
"Sleep is very important and to eat well is very important. These two aspects help the player recover quicker.
"If you have the correct nutrition and sleep, you can recover quickly, you are ready to work, also sometimes to work very hard and to avoid injuries. To be professional, it means to have all these situations in your mind.
"I spoke to the nutritionist. This aspect is important because you have to have good fat and good muscle. This is a part of our work and the players' work.
"To be professional means you have to take care of your body. If you do this you risk less injury, and you are ready to face the training because sometimes the training is hard.
"I am going slowly, slowly because now the priority is to work very well on the pitch, to make the physical, tactical and mental aspects the priority. For sure, we are going step by step. We want to improve every aspect of my players.
"Usually when I start to work with players, maybe at the start someone cannot understand something like this, but then when they start to understand, they don't go away from it."
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