The 38-year-old singer said he opts not to eat once a week because it improves his levels of creativity.
"I fast one day a week and creativity is a benefit of it. I started when I was sick one time. This guy said to try not eating for a day, he told me it would make my body feel healthier.
"It did and I found I could sing better and I also felt more grateful for food and everything else in a way that I wasn't so much before."
"You are supposed to go for something healthy like a kale salad, but I tend to have Nutella and pancakes, which is terrible and completely defeats the point, but I am doing the first bit.