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Bonito Flakes (dried fish flakes). Traditional flavoring used in Thai, Chinese, Japanese etc., soups & dishes.
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Bone Marrow. Extracted from animal bones. Used in broths.
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Carmine (cochineal insect extract). Used as a red food dye (natural red 4, C.I. 75470, or E120).
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Castoreum (beaver anal glands). Uncommon but is used in vanilla and musk scents/flavorings.
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Isinglass (fish bladders). Used in beer and wine making. See Barnivore.com for an updated list of vegetarian brands of beers and wines.
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Gelatin (extracted from animal skin, bones and tissue).
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Lard (rendered animal fat).
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Rennet--Used in cheese making. See vegetatio.com for an updated list of vegetarian brands of cheeses.
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Lipase (pre-gastric tongue root glands of lambs/calves used in cheese making). See vegetatio.com for an updated list of vegetarian brands of cheeses.
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L-cysteine (feathers/hair). Used in bread making.
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Lanolin (sheep oil). Vitamin D supplements.
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Pepsin (pig stomach). See Rennet.
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Gelatin Gelatin is produced from pig, cow and chicken bones. (Sometimes fish bones for rare Passover marshmallows.) Anything with marshmallow has gelatin in it. This includes those hard little cereal marshmallows. Gelatin is also found in most gummy candy, some jellybeans, even most Candy Corn. It's also found in everything by the Necco brand of candy (Necco wafers). It's often found in pudding or cheesecake desserts, and it's in Costco chocolate cake. Those shiny tarts with the fruit on top? Gelatin is usually in the clear film on top. Some random foods with gelatin added - instant rice, peanuts, some wine and beer is cleared with it.
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MacDonald's French Fries BEEF! These contain an ingredient you would not expect in a french fry - cow! Also look out for lard in any refried beans or in Mexican food in general. This may be limited to the USA.
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Prepared pie crusts More often than not these contain LARD instead of vegetable shortening. At most health food stores you can find veg-friendly alternative, but most at the mega-marts are lard laden.
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Texas Roadhouse sweet potatoes I thought this was safe - but they're rubbed down in bacon grease before cooking.
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Cheese rennet Unless it says vegetable rennet you can assume it's animal rennet, made from the stomach of cows, making your cheese. I don't know how much rennet stays in the final product (or if it is flushed with the whey) but it's good to know.
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Hidden anchovies Lots of items like sauces, dressings, and flavorings, contain Worcestershire sauce, which itself contains anchovies.
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Chicken stock/fat I find this in so many products, from soups, chips, rice, noodle dishes, etc. It's one you can find almost anywhere.
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Quinoa Protein: 8 grams per 1-cup serving, cooked
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Buckwheat Protein: 6 grams per 1-cup serving, cooked
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Soy Protein: 12 grams per ½-cup serving (firm tofu), 15 grams per 3-ounce serving (tempeh), 18 grams per 3.5-ounce serving (natto), 17 grams per 1-cup serving (edamame)
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Mycoprotein (Quorn) Protein: 13 grams per ½-cup serving
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Rice and Beans Protein: 8 grams per 1-cup serving
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Hummus and pita Protein: 7 grams per 1 whole-wheat pita and 2 tablespoons hummus
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Spirulina Protein: 4 grams per 1 tablespoon
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Peanut butter sandwich Protein: 15 grams per 2-slice sandwich with 2 tablespoons peanut butter