Unfortunately it doesn't necessarily work that way...
In the past few yrs, advanced genetic techniques have allowed scientists to discover at least 9 different gene clusters that contribute to the development of IBD and DEFINE THE SEVERITY AND BEHAVIOR of the disease over time.
My mom got UC in her mid 60's and at that point is was somewhat managable, she's 80 now and for the last 9 yrs her UC has been horrible, I mean "accidents" 4-6 times a day while she's at home.
Everyone is different for sure, but according to science our genes are in control of the behavior and severity more then we likely are...but I'm a firm believer in diet, supplements and regular exercise in helping manage symptoms better.
My bum is broken....there's a big crack down the middle of it! LOL :)