This is definitely the hardest intolerance to deal with. It is my highest allergy which I get physically sick from if I ingest. Also, it is the allergen that I am having the hardest time finding information on. I will give you everything I have found so far. Hopefully, I can post later with loads of information.
Foods that MAY contain Baker's or Brewer's yeast:
Aged meats (sausage, bacon, etc.)
Alcohol
Any baked good with baker’s yeast (pizza dough, bread, etc., including most sourdough breads)
Anything fermented (vinegar, alcohol, bean paste, soy sauce, etc.)
B Vitamins, unless stated that they are not from yeast
Bagels
Baker's yeast
Barbecue Sauce
Barley malt
Beer
Bisto
Black tea
Blackberries
Blueberries
Bread
Brewer's yeast
Buttermilk
Canned and frozen fruit juices
Canned or bottled juices
Cheese (all kinds)
Chili Sauce
Cider
Citric Acid (this used to be made from citus juice, but is now made from fermented corn)
Coffee
Cream Cheese
Dates
Dried fruits such as apricots, figs, or raisins
Engevita
Figs
Flavor enhancer (usually MSG, though it may also be yeast extract)
Ginger Ale
Grapes
Grape Juice
Horseradish
Jams/ Jellies
Ketchup
Lactic acid (generally made from fermented corn or potatoes)
Liquor
Malt
Malt beverages
Malted barley flour
Mayonnaise
Mincemeat
MSG (often extracted from autolyzed yeast extract or from wheat)
Mushrooms
Mustard
Nutritional yeast
Olives
Peanuts and peanut products
Pickles
Pita Bread
Pizza Crust
Powdered Milk
Preserved or pickled foods
Pretzels
Prunes
Raisins
Relish
Ricotta Cheese
Root Beer
Rusk
Sake
Salad Dressing
Shrimp Sauce
Sour Cream
Sour dough bread
Soy sauce, miso, tamari
Steak Sauce
Strawberries
Tea
Tempeh
Torula
Vecon
Vinegar (and foods containing vinegar, such as olives, mustard, ketchup, etc.)
Vitamin B supplements (depending on the source of the vitamin B)
Wine
Worcestershire sauce
Yeast extract (autolyzed, hydrolyzed)
Yeast spreads such as Vegemite or Marmite, etc.
Note: Since this is not as cut and dry as the other allergens, the easiest way to figure out what you can and cannot have pertaining to yeast is an elimination diet. Start off by not buying anything that has any type of yeast on the label or anything that you know contains yeast such as vinegar and grapes, etc. Then try adding back one food/product at a time.
On a product label, the ingredients are listed in order of predominance, with the ingredients used in the greatest amount first, followed in descending order by those in smaller amounts.
Try adding back things that have the yeast/vinegar listed as one of the last ingredients. It will not be as dominant in your food. Then if you tolerate it, you can try more things.
Personally, I know that I cannot tolerated any type of bread or anything that contains yeast extract. I can, however, have modest amounts of mustard and most barbecue sauces.
Test it out. If you have any advice, add it below. This is a difficult allergen to deal with as it is not clearly labeled "baker's yeast" or "brewer's yeast" on the label.
