sisson is married to his wife carrie. they have two children. sisson is a follower of the paleo diet and markets his own version of it, called the "primal blueprint" diet.. as part of this initiative, he started a food blog, "mark's daily apple", in 2006 and has also written a number of diet and exercise books, including the best-selling book, the keto reset diet: reboot your metabolism in 21 days and burn fat forever.