What foods are pus, mucus, and acid-forming? In the Mucusless Diet Healing System, Prof. Arnold Ehret asserts that pus and mucus-forming foods are the foundation of human illness and should not be eaten. In short, pus and mucus-forming foods include meat, poultry, dairy, grains, starches, and fats. Yet, it must be understood that just knowing what these foods are is not enough. It is important to know how to rationally and safety TRANSITION off of the most dangerous pus and mucus-formers over a longer period of time.

The word “mucus” is from the Latin mucus which means “slime, mold, snot, etc.” Mucus refers to a thick, viscous, slippery discharge that is comprised of dead cells, mucin, inorganic salts, water, and exfoliated cells. It also refers to the slimy, sticky, viscous substance left behind by mucus-forming foods in the body after ingestion. The word “pus” is from late 14c. Latin “pus” (related to puter [putrid] “rotten”), from Proto-Indo-European*pu- compared to Sanskrit. puyati “rots, stinks,” putih “stinking, foul.” Pus often refers to a thick white, yellowish, or greenish opaque liquid produced in infected tissue, consisting of dead white blood cells, bacteria, tissue debris, and serum. It also refers to the substance that dead animal flesh is chemically changed to after being consumed or while rotting in one’s digestive tract. The ingestion of meat and dairy products create pus residue in the body, while starchy and fatty foods are mucus-forming.

The word “mucusless,” or mucus-free, refers to foods that are not mucus-forming. Such foods digest without leaving behind a thick, viscous, slimy substance called mucus. These foods include all kinds of fat-free, and starchless, fruits and vegetables.

All foods that are pus/mucus-forming are acid-forming. The word “acid” is from the early 1600s meaning “of the taste of vinegar,” from French acide (16c.) or directly from Latin acidus “sour, sharp,” adjective of state from acere “to be sour,” from PIE root *ak- “sharp, pointed.” In chemistry it refers to a class of substances whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red, and the ability to react with bases and certain metals to form salts. From a mucusless perspective, pus and mucus-forming foods are understood to be “acid-forming” inside the human body. Such foods create an acidic internal environment that is detrimental to wellness.

professor_spira (5)Later this month we will be releasing the first revised and annotated edition of Arnold Ehret’s Mucusless Diet Healing System. The following is a list of pus, mucus, and acid-forming foods that will be in this new reference edition of the Mucusless Diet. This is not an exhaustive list, but the most common acid-forming foods. It must be emphasized that not all of these foods are forbidden on the Mucusless Diet as a Healing System. Ehret’s TRANSITION DIET will show you how to use less harmful mucus-forming foods to get off of the worst ones. Pus and Very Mucus-forming foods should be avoided from the beginning if possible. But Moderately or Slightly mucus-forming items may be used effectively during the transition. See the TRANSITION DIET section of the Mucusless Diet or Spira Speaks for more details:

List of Pus, Acid, and Mucus Forming Foods



  • Blood of Animals
  • Eggs (All Kinds)
  • Lard
  • Meat (Beef, Chicken, Horse, Dog, Mutton/Lamb, Turkey, Veal, Pork:
  • Bacon, Ham, Sausage, Gammon, Chitterlings, Pig Feet; Wild Game: Bison, Buffalo, Ostrich, Rabbit, Venison, etc.)
  • Margarine (Made with Animal Fat)


  • Crustacean (Crab, Crawfish, Lobster, Shrimp)
  • Fish (All Types)
  • Mollusks (Clam, Oysters, Mussels, Snail, etc.)
  • Roe (Caviar)
  • Salmon
  • Shell Fish


  • Butter, Cow
  • Buttermilk
  • Cheese (All Kinds)
  • Cream
  • Crème fraîche
  • Kefir
  • Milk (All Animals and Kinds; Raw Organic, Skim, 1 or 2 %, etc.)
  • Yogurt


  • Barley
  • Breads (All Kinds; Barley, Black, Rye, White, Graham, Pumpernickel,
  • Zwieback, etc.)
  • Cereal Grains (All Kinds; Maize, Farina, Kamut, Millet,
  • Oats, Quinoa, Spelt, White Rice, Brown Rice, Whole or Refined Wheat, etc.)
  • Cornmeal
  • Pseudocereals (All Kinds; Amaranth, Buckwheat, Chia, Cockscomb, Kañiwa, Quinoa, etc.)
  • Pastas


  • Beans (All Kinds and Forms; Black Beans, Black-eyed peas, Fava Beans, Butter Beans, Cannellini Beans, Chickpeas/Garbanzo Beans, Edamame, Great Northern Beans, Italian Beans, Kidney Beans, Lentils, Lima Beans, Mung Beans, Navy Beans, Pinto Beans, Soy Beans, Split Peas, String Beans (Green Beans), White Beans, etc.)


  • Nuts (All Kinds; Acorns, Almonds, Brazil Nuts, Cashews, Chestnuts, Hazelnuts, Peanuts, Pecans, Pistachios’, Walnuts, etc.)
  • Seeds (All Kinds; Sunflower, Pumpkin, Hemp, Seasame, etc.)


  • Dried Convenience Foods
  • Fast Foods
  • Frozen Convenience Foods
  • Packaged Convenience Foods
  • Processed Meat


  • Baked Goods (All kinds including pies, cakes, pastries, etc.)
  • Candy (All Types; Bars, Caramels, Chocolate, Fudge, Jelly candies, Rock
  • Candy, Taffy
  • Gelatin (Jello)
  • Ice Cream (Dairy and Non-Dairy)
  • Marshmallow


  • Alcoholic Beverages (All Kinds; Ale, Beer, Brandy, Champagne, Hard
  • Cider, Liqueur, Mead, Porter, Rum, Sake/Rice Wine, Gin, Herbal Wine, Lager, Fruit Wine, Vodka Whisky, Tequila, etc.)
  • Syrups (Brown Rice, Barley Malt, Chocolate, Corn, Artificially Flavored)
  • Cocoa
  • Coffee
  • Kombucha Tea
  • Soft Drink (Soda Pop)
  • Tea (All Kinds from the Theaceae family)
  • Vinegar (White, Apple Cider)
  • Old-fashioned Root Beer


  • Fish Sauce
  • Fermented Vegetables (All; Kimchi/cabbage and other veggies, Olives
  • Pickles/cucumbers. Sauerkraut/cabbage, etc.)
  • Miso
  • Sauces with Vinegar (Hot Sauce, Ketchup, Mustard, Mayonnaise, Relish,
  • Tartar, Barbecue, Salad Dressings, Salsa, etc.)
  • Soy Sauce


  • Chips (corn, potato, plantain, etc.)
  • Frozen Vegan Breakfast Foods (waffels, etc.)
  • Hummus (processed chickpeas)
  • Lab Grown Animal Tissue
  • Margarine
  • Nutritional Yeast
  • Pasta (egg-free)
  • Pasteurized 100% Fruit Juice (potentially acid-forming)
  • Plant milks (grains, nuts, seeds, and legumes including soy, rice, etc.)
  • Plant-based butter (nuts, seeds, and legumes including soy, peanut, etc.)
  • Plant-based creamers
  • Soy Lecithin (food additive)
  • Tempeh
  • Texturized Vegetable Protein (‘mock’ meats including soy, etc.)
  • Tofu
  • Vegan Baked Goods
  • Vegan Confections (All Types; Chocolates, Ice Cream, etc.)
  • Vegan Cheese Substitutes
  • Vegan Mayonnaise
  • Vegan Whipped Cream
  • Yogurts (Plant-based)


  • Oil (All types; Avocado Oil, Chia Seed, Coconut, Corn, Cotton Seed, Cotton Seed, Flax Seed, Grape Seed, Hemp Seed, Nut Oils, Olive, Palm, Peanut, Quinoa, Rapeseed (Including Canola), Safflower, Soybean etc.)


  • Black Peppercorns
  • Cayenne Pepper
  • Chili Powder
  • Cream of Tarter
  • Curry Powder
  • Nutmeg
  • Paprika
  • Pepper
  • Salt (Celery, Crystal, Iodized, Sea)
  • Vanilla Extract


  • Artichoke
  • Avocados
  • Cassava
  • Cauliflower (Raw)
  • Coconut Meat
  • Corn
  • Durian
  • Fungus (Mushrooms)
  • Green Peas
  • Olives
  • Parsnips
  • Peas (Raw)
  • Plantain
  • Plantains
  • Pumpkins
  • Raw or Baked White Potatoes
  • Raw Squashes (Winter, Acorn, Butternut, etc.)
  • Raw Sweet Potatoes
  • Rutabaga
  • Turnip
  • Unripe Banana

What are Deceptive Mucus-Formers?

Here is a list of foods that many people do not realize create mucus:

  • Rice (great for creating glue to bind books, bad for the transition to a mucus-free diet)
  • Avocados (fatty item that may be used on the transition, but are highly addictive. Although technically a fruit, if used it is best to combine them with a mucus-free combination salad or vegetables to aid elimination. However, it is recommended to stay away from them if you are not already stuck to them.)
  • Nuts (Mucus-forming, but may be used on the transition. It is best to eat with dried fruits like raisins to aid with elimination.)
  • Plantains (Starchy)
  • Tofu (Slimy and mucus-forming.)
  • Un-ripened fruits like green bananas (the riper the fruit you eat the better).
  • Corn (It does not eliminate well. When cooked, corn becomes mushy and slimy in the intestines.)
  • Corn chips (Some people use them on the transition, but they are very addictive and do not eliminate well)
  • Beans (They are starchy and mucus-forming. But, they may be used sparingly on the transition within close proximity to green-leafy salads)
  • Starchy Vegetables (Some vegetalbes are starchy and mucus-forming in raw or cooked forms, such as white potatoes. But, many other vegetables, such as sweet potatoes, become almost mucus-free (starchless) after proper cooking.

The Transition Diet

It is very important that people learn how to transition from the most harmful mucus-forming foods to the ones that leave behind the least amount of waste. To learn more about this transitional process, check out the TRANSITION DIET section of the Mucusless Diet Healing System. 

***A list of mucus-free foods will be coming soon***

Prof. Spira is an expert on the Mucusless Diet, webmaster of ArnoldEhret.us, and author of “Spira Speaks: Dialogs and Essays on the Mucusless Diet Healing System” where he reveals how he lost 110lbs and overcame numerous illnesses by practicing Arnold Ehret’s Mucusless Diet Healing System. He is also the editor of the first critical edition of the diet entitled “Prof. Arnold Ehret’s Mucusless Diet Healing System: Annotated, Revised, and Editied by Prof. Spira.” 


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