Anal leakage is a medical condition of faecal incontinence most recently associated with early Olestra-based products. Anal leakage affects about 2% of adults.
Foods that makes the consistency of the feces more runny such as a heavy intake of beer, can make it difficult for the anus to retain matter.
In the United States, the 'non-fat fat' called olestra (Olean) and used in some 'slimming' foods has gained unwelcome publicity for this reason. It is an artificial mixture of fats, none of which can be digested or absorbed. Instead, it goes straight along the gut and is passed out. This means that the feces are runny and slippery with fat, and anal leakage can occur. Some snack foods (e.g. some crisps) contain olestra, but the amount in the snacks is usually too small to cause a problem.
Foods which cause gas can also make leakage more likely. This is because the anus has to relax to let the gas out, and some fecal material may be propelled out at the same time.
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