Burgers make me sick but I can't stop eating them.

Hey. Hamburgers were a staple of my diet growing up. I am now 27 years old and have just started to have trouble with burgers. I will eat a hamburger, either from a fast food place, restaurant or homemade, and 10-15 minutes later I'll be in the bathroom. It seems to go right through me. This was never the case a year ago. I think my body is slowly starting to reject it. I know i need to start to eat healthy, but my brain wants that goodness. It’s a constant battle between my brain and my stomach. "That burger is good, but you know you'll be sick within minutes of eating it, don't get it!" My brain usually wins this battle and I get the burger, again, fully aware of the consequences of being sick. I need help. I need to eat healthy, but I enjoy it so much!