Fasted for 3 days then thew it away - tips?

I did a 3 day fast, just water, tea and gum. I honestly felt so good and even stronger in the gym. Pretty certain that's thanks to cutting out the sugar I've been eating lately. However a few days out of the fast I've fallen back into eating sweets. I really thought it'd reset me.

I'm starting the fast again tomorrow. Any ideas on how to stay the course after the fast?