Previously when Simon was spotted with his partner, Lauren Silverman, he clutched onto a low-calorie lager, showing he is taking his health seriously.
Simon and Lauren became a couple in 2013 and have been together ever since.
They have a five-year-old son, Eric, who was born on Valentine’s Day in 2014.
The celebrity judge also revealed that when he was hospitalised in 2017 for low blood pressure, it was a massive shock to his system.
Speaking to Extra TV, Simon said: “I went to see this guy who’s very well-known. And he said to me, after doing some blood work, ‘You can’t have red meat, dairy, sugar, bread or gluten’.
“He told me my diet was appalling and I had to cut out fatty foods and certain drinks.”
Speaking about the first few weeks on his new diet plan, the star revealed that it was difficult in the beginning.