A digestive biscuit, sometimes described as a sweet-meal biscuit, is a semi-sweet biscuit that originated in scotland. the digestive was first developed in 1839 by two scottish doctors to aid digestion. the term "digestive" is derived from the belief that they had antacid properties due to the use of sodium bicarbonate when they were first developed. historically, some producers used diastatic malt extract to "digest" some of the starch that existed in flour prior to baking.first manufactured by mcvitie's in 1892, their digestive is the best-selling biscuit in the uk. in 2009, the digestive was ranked the fourth most popular biscuit for "dunking" into tea among the british public, with th...

Source: Wikipedia