No they don’t feed yeast because they only feed beneficial bacteria. If they did feed yeast, it’d feed it just as much as other foods we eat.
There are dozens of types of sugars and in fact, there is no way to completely avoid sugar while on the diet. For instance, a head of lettuce contains 3g of sugar and a red onion contains 5g of sugar. If we were to avoid all foods containing sugar, there would be nothing left to eat except for water.
Everything we eat feeds candida; its all about feeding candida less than with other foods.