Di Canio, who took over from Martin O'Neill back in March, vowed to get tough with his players after they barely avoided relegation last season.
He has revealed some of his methods ahead of Saturday's clash with Fulham and he hopes they will pay dividends in keeping his players much fitter than the versions he was critical of soon after his arrival on Wearside.
"This is a complete revolution," he told the Daily Telegraph.
"We've focused on changing the whole dressing-room environment. Imagine if for years your habit is to use the phone when you're having a massage on the bed, even one minute before going out to train?
"For 25 days I accepted this, because my first priority was to work on the field. However, I've said that from now if someone comes inside with a mobile phone, even in their bag, I'll throw it in the North Sea. They're banned.
"We need to have lectures about why we can't have everyday things like mayonnaise, ketchup and Coke.
"Even coffee can be a problem. You can have one when you get up, but not an hour before you go out training or playing. We give the players diet sheets to follow.
"Obviously, you have to enjoy life. I won't say anything if one day you like to go and have a cheeseburger.
"I ban my daughter from going to places like that, but I know sometimes she goes because she enjoys it and because it's typical of a student. It is all right, but not as a habit."