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The 2.02 protocol says that "traditional candida diets fail for many people [due to being] far too restrictive and prone to failure." The specific dietary suggestions offered there are to "reduce sugar where possible and avoid refined sugar, processed foods and yeast" and to "cut out bread and yeast products."
Bread
Because the protocol says to avoid yeast, the most common suggestion is to use unleavened bread. However, there are other leavened breads without yeast, such as soda bread, that use baking soda or other non-yeast leavening agents.
Mushrooms
Space Cowboy has recommended avoiding any kind of edible mushrooms[1].
Alcohol
The consensus on the forums seems to be to never drink beer while on the protocol. Red wine and gin seem to be frequently recommended[2] if alcohol must be consumed. It is also suggested on the forums to increase NAC dosage if drinking[3].