Small doses (4g - 18g - depending on how one spreads ones carbs over the day) however, are permittable within the Drs. Eades Protein Power plan, and workable within the Westman/Phinney/Volek New Atkins for realistic treats and cultural special occasions. Heck, the above physicians include recipes which include maple syrup (Phinney & Volek) and triple sec (Eades).
For non-medical keto, micro doses of sugars within a well-formulated very low carb plan aren’t the problem - the higher carb pattern and/or the the cravings due to not having reached 100% fat adaptation however is.