He Mark, No stevia is allowed because the body/mind reacts to it in a similar fashion as other sweeteners.
After a few days things like almond butter and things with cinnamon will taste sweet.
Good luck on your journey, Margaret

I abstained from all sweeteners, including stevia, for the first three months on the plan. Then I added back a cup of coffee with a drop of stevia and continued to do fine. After 7 months I also added back grapefruit with a little stevia. Other than that small amount of stevia, I have avoided all other sweeteners and don’t miss them. I would definitely recommend that you not use stevia when in the beginning phase of the plan and only add back a limited amount, if needed, after having success on the plan for at least three months.