Free Day on Massive Eating/Don't Diet?

I’ve read through all of the articles and posts on these diet plans but I can’t find any information in regards to allowing a free day/cheat day on either one. I’m assuming since it’s not mentioned that it is a no-no but I thought I’d get a definite answer. So JMB if you’re reading this can a free day be worked into these plans once a week? Or if anyone who may be following these plans, specifically for weight loss, have you been incorporating a free day during the week and if so how have the results been?

just bumping it up