The former heavyweight world champion began struggling with his mental health following his sensational victory over Wladimir Klitschko in November 2015.
Drink and drugs became a regular theme in Fury's life as he struggled with the intense pressures of the sport, with his weight ballooning up to 400lb.
Speaking on the Joe Rogan show, Fury, who has now turned his life around and shed 150lbs in the process, opened up about the depths of his despair.
He said: "My weight was put on through drinking excessive lager.
"There are 500 calories in a pint of lager and I would go out and drink 18 of them followed by whisky and vodka, then I'd stop off on the way home and eat pizzas and kebabs."
He continued: "Before I was doing a lot of long running and long boxing work, like 12-15 rounds on the pads.
"When I was losing the weight I was doing shorter, explosive stuff, doing more interval training.
"My diet was the most important thing, you can train like a Trojan warrior but not eat right and take three steps forward and two and a half back."
Fury has fought twice since deciding to come out of retirement earlier this year, and now faces WBC world champion Deontay Wilder in a mouthwatering heavyweight contest on December 1.
The 30-year-old has relocated to the Big Bear in California to complete his training camp.
And he said: "When I'm not training I am thinking about training, when I'm not thinking about training I'm sleeping, and when I'm not sleeping I'm eating, when I'm not eating, I'm resting, watching TV.
"Training at altitude has been very hard. The air is thin and it's hard to breathe.
"I came over here and I was already very fit, could fight 12 rounds on the pads, no problem. Here, I am tired after three or four rounds.
"I don't leave the Big Bear. I went down a mountain to Ontario last week, just to check everything was going right.
"I was feeling very tired in the gym – I was speaking to Lennox Lewis on the phone and he told me he got out of there after a week.
"He said he hated it and it was too hard. I went to sea level, and I was very fit."
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