I’m honestly unsure as to how acidophilus/probiotics should be taken, as some people say to take it before food, others say with food. I was researching this the other day for another question on here and found several websites that push me a bit over the line to the “take with food” camp.
I’m too tired to find the source, but a bacteriologist explained that food causes the pH in the stomach to rise, which then allows bacteria to survive the normally-acidic environment and pass on to the intestines.
Personally, I would go the yogurt route if I was just trying to maintain a healthy system, but I would go for a supplement if I was trying to attack a specific problem. Much easier and more straight-forward, and I can be certain of how much I’m ingesting.
As an aside, yeast feeds on sugar, so that’s a huge part of why sugar consumption should be reduced during a yeast infection.