Antibiotics
For those that believe Crohn’s is caused by a parasite or bacteria, or in cases where the body has become overrun with infection, antibiotics can completely flush the system of these harmful organisms.
Problem is, there are good bacteria that live in your gut, and antibiotics destroys them too. So it’s less like weeding a garden and more like burning the whole thing. Then both the good and the harmful bacteria have to start from scratch when they rebuild their colonies again.
If you put the right stuff back into your gut by not eating junk food and creating the opportunity for beneficial bacteria to grow by eating foods like yogurt, which contains live bacterial cultures, you can come off a course of antibiotics on the right foot.