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Just over a year on from his quick and brutal stoppage against Donald 'Cowboy' Cerrone, the Irishman takes on Dustin Poirier for the second time inside the Octagon in a huge UFC 257 main event in the promotion's first pay-per-view of the year.
McGregor has a much more muscular physique at 155 lbs this time around and his nutritionist has provided some insight into his current food intake.
"His diet consists of lean sources of protein: chicken, fish, salmon, beef, eggs," Tristin Kennedy told ESPN.
"Good complex carbohydrates. Good micro elements -- your herbs, basil, oregano. All these things are incorporated into the diet as a whole.
"We have a great balanced diet. From multiple protein sources, multiple carbohydrate sources of wholesome foods. And that's the key."
McGregor is in the final stretch of his preparation for Poirier on fight not but Kennedy says there will not be a sudden calorie cut going into the all-important weigh-in.
He added: "We're going into our final few weeks on point. We've started the gradual descent for a few weeks now.
"It has not been mad drastic in terms of calorie cuts. We have to, again, make sure he's fuelled. Make sure he performs in training.
"You don't want these camps to turn into fat camps where it's just calorie restriction and then the athlete can't train.
"It's about getting that balance right between energy and weight loss. There's a fine line with all that.
"Because I've been with him so long and know his body and know how he performs -- using all those resources as a team -- you get a fairly good idea and a fairly good direction on where to go."
McGregor's coaches, who have been with him for years, all believe he is in prime physical condition and Kennedy, who is providing him with the fuel to train on, is inclined to agree.
"Several people have commented already that this is the best shape he's ever been in.
"They're the people that are closest to him throughout all the camps. Owen Roddy [McGregor's striking coach] just said it.
"John Kavanagh [McGregor's head coach] just recently said it. I would absolutely agree.
"I guess going from what I've seen and what I know, the man is phenomenal and ready to take on this fight and do well."