The music mogul broke his back in what media outlets described as the 'freak accident' riding an electric bike.
Since then, he has been recovering in hospital, and according to reports, his girlfriend Lauren Silverman has been bringing him meals like cottage pie with turkey.
Cowell revealed earlier this year that he'd lost about 60lb since ditching animal products. Speaking about life in quarantine with Extra's Terri Seymour, he said: "I'm doing a bit of cooking. I'm exercising quite a lot during this time as well, [I'm] still sticking to the diet so I do feel good at the moment.
"The only difficult thing is when Eric [his son] orders a pizza or something. That's hard because the pizzas are the number one thing I miss.
"I think I have dropped, since I started this diet just over a year ago, maybe 60lb."
'Traditional comfort foods'
But now a source has told The Mirror: "Lauren has been to the hospital to drop a few things off once each day. She has been making his favorite Italian bean soup and also cottage pie with turkey, which he loves.
"His diet is incredibly healthy but there's nothing better than traditional English comfort foods and treats when you're on the mend."
Cowell is reportedly recovering well from the accident, with many speculating that he will be discharged from hospital this week.
Last week he underwent a six-hour operation, where surgeons inserted a metal rod in his spine.
He is said to be 'in good spirits' and replying to work emails. He has not publically commented on his dietary changes, though has spoken out to thank the nurses and doctors who have treated him.