Aware that some fruits have a high sugar content, he also pays attention to the fresh produce that he eats.
Simon has also cut down on the amount of beer that he drinks, and the cigarettes that he smokes.
What’s more, the producer appears to choose carefully when he does drink.
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’.