The "Superbad" star turned to a nutritionist in a bid to slim down, and, as part of his work with the adviser, Hill was required to write a diet diary to keep track of his calorie intake.
And, on one occasion, the actor mistakenly emailed the document to the "Best I Ever Had" hit-maker - instead of his doctor.
During an appearance on "The Tonight Show With Jay Leno" on Monday, Oct. 24, 2011, he explained, "I went to see a nutritionist and he told me what to eat to lose weight and how to exercise and stuff. But one of the quirky things he had me do was... email him what I eat everyday... So one night I'm all stressed out at work and I'm like, 'Oh, I forgot to email the nutritionist what I ate.'
"So 'Dr' is doctor, under my phone (contacts list), and so I write down what I ate today like, '10am - omelet', or whatever, and it's just a list of things I ate that day. And I looked at my phone later and I accidentally sent it to Drake, the rapper, not the doctor. So this rapper named Drake got an email from Jonah Hill at like 11:30 at night with the subject, 'What I ate today.'
"I hadn't met him yet. We just had been emailing about something. We didn't know each other very well. I saw him like two weekends ago when he was on Saturday Night Live and I went to the show and he didn't bring it up, so I didn't bring it up. So I just decided it's one of those things we will never talk about."