Gluten is in wheat. I think it is important factor in bagel making.
High gluten flour is preferred for most baking, and especially pasta making.
I remember the "dog disease" chatter. A long time ago.
I've been reading that some suspicions are now including DRY pet food. If it can show up in pet food, it is foolish to think it cannot be in human food.
Scary!
It's not just wheat that contains gluten. It's things like ice cream, soup, and cereal. From the net:
SOME SOURCES OF HIDDEN GLUTEN
Bouillon cubes
Breakfast cereal – may contain malt flavoring.
Brown rice syrup
Candy may be dusted with wheat flour; ask.
Canned soups – Most are not acceptable.
Cheese spreads & other processed cheese foods.
Chocolate – Check if contains malt flavoring.
Cold cuts, Wieners, Sausages – may have gluten due to cereal fillers.
Dip mixes
Dry sauce mixes
Envelope & stamp glue
Face powder and other topical cosmetics/lotions (especially for DH’ers).
Dry roasted nuts & honey roasted nuts – Check.
French fries in restaurants – Same oil may be used for wheat-containing items; check.
Gravies – check out thickening agent and liquid base.
Honey Baked Hams™ - based with wheat starch in coating.
Ice Cream & Frozen Yogurt – check ingredients.
Instant Teas & Coffees – cereal products maybe included in the formulation.
Lip Balms
Lipsticks
Mayonnaise – check thickeners; Hellmann’s & Kraft Miracle Whip are OK.
Mustard – Mustard powder may contain gluten; check.
Oil, frying – Check for cross contamination.
Poultry and meats – Check out the flavorings and bastings; even when the label says "water"; this may be hidden gluten.
Soups, soup mixes and broths – Check.
Sour cream – May contain modified food starch of indeterminate source.
Toothpaste – Check out.
Tortillas, Corn – May be dusted with wheat flour on conveyor belts.