You can also try to ensure you eat some fat with the sugar. Fat slows down the absorption of sugar. Fructose is the greater offender vs sucrose, when it comes to pulling water into your digestive system, and other than fruit it’s used heavily in soda. Artificial sweeteners can also have a similar effect.
To be honest, I’ve found it’s pretty hard to tie the state of my poo to any one thing. And elimination diets are notoriously difficult to maintain. We just aren’t wired to easily refuse something…research finds that eliminating foods simply increases the craving for them. Life is too short to guilt yourself over every treat…if it helps maybe try to think of sugary treats as small rewards for dealing with all the other issues that you have faced up to now, and will face in the future. Have some in moderation and focus your stress on other things you can better control.