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Yogurts
Yogurt can be enjoyed in just about any form—as a frozen, unfrozen, as a major ingredient in a beverage and even (mostly in Asia) as a type of cheese. Originally an Asian product, in the 20th century yogurt became so popular in the western world that it’s now considered a staple in the West as well.
Yogurt is made from a mixture of pasteurized milk, flavorings, seasonings, stabilizers, emulsifiers, and acid cultures. Flavors and varieties abound. Most yogurt contains beneficial bacterial cultures that aid digestion of the product itself and promote a healthy intestinal environment.

can yogurt last 3 vweeks past sell by date
Hi! We contacted our shelf life guru, Ethel Tiersky and she suggested checking out these articles for more specific info:
http://shelflifeadvice.com/content/unopened-yogurt-still-safe-eat-after-sell-by-or-best-before-date
http://shelflifeadvice.com/content/once-opened-how-long-will-yogurt-remain-safe-and-tasty-use
Thanks for your question!