Sara Lee Cheesecake is Shrek's favorite food and Shrek eats a lot of her products and after he eats it he craps, It is unknown that Shrek eats Doritos, McDonald's and Cheesecake and craps non stop. In Shrek's Nightmare it is revealed that Sara Lee stopped making cheesecake products.
In the SML Special: Valentine's Day, Shrek and his Cheesecake are valentines.
In the SML Movie: Mario's Valentine's Day Problem, Shrek's Cheesecake is confirmed to be his one true valentine.
According to Baby Shrek, Shrek is married to Sara Lee and had Baby Shrek, who was born through Shrek's butthole.