Welcome to the FTS family, Siltz!!!
Early on, I've had a couple "cheat days" and ended up paying the price by slowing my progress for 10-14 days each, and experiencing sugar detox symptoms afterword.
So you understand, sugar detox is what we experience for up to a couple weeks after we start to deprive our bodies of sugar. And like detox from an addictive drug, some discomfort is not unusual.
FTS is a lifestyle... Life is an every day event.
No more than we can (or would want to) take a day off being alive, we should not purposely derail ourselves by "cheating". Like Umpa said, we only cheat ourselves when we do it.
We use replacements for our favorite high carb (sugar) foods. This minimizes urges to "cheat".
But if we unintentionally "slip", we know all we need do is go back to the FTS rules and continue our journeys.
The FTS eating lifestyle program is fully spelled out in Doug's book.
I encourage you to reread it. I've read my copy over a dozen times!
Tony