Also, something I noticed…and I assumed it was just mis-represented, was the word ‘gross.’
1800 GROSS calories, or even 2400 gross calories a day, while following a structured training plan would be a very, very low amount, probably bordering on forcing the body into reducing metabolism. Adding calories back in after under eating for an extended time could very well cause significant gain.
I assume however…that the 1800 and 2400 calories are actually NET calories, IE total calories consumed minus calories burned during training.