I have figured it out!
Tyson Fury is eating all the carbs in the UK.
This way Joshua can't get his carb boost and wont be able to stay ripped.
The man is playing 4D chess.
http://e1.365dm.com/16/04/16-9/20/tyson-fury-boxing-heavyweights_3457334.jpg?20160429122030
http://cdn.images.express.co.uk/img/dynamic/102/590x/Tyson-Fury-736437.jpg
https://media.giphy.com/media/AweMfPaVIS5kA/giphy.gif