Whenever I feel a little light headed or tired, it helps to eat something sweet. Specifically, simply chewing or sucking on a sweet seems to aleviate the symptoms within a matter of seconds and then the sugar seems to kick in. So I was wondering whether it is just a psychological effect, or whether sugars are absorbed in our mouth and reach the brain (or wherever the sugars exert their effects?) within seconds. Or is perhaps the taste of sugar sufficient to signal the body that it can safely release some extra energy as resupply is imminent?
Yes we do. The first part of digestion starts in mouth. Digestion begins in the mouth, where chemical and mechanical digestion occurs. Saliva produced by the salivary glands (located under the tongue and near the lower jaw), is released into the mouth. Saliva begins to break down the food, moistening it and making it easier to swallow. A digestive enzyme (amylase) in the saliva begins to break down the carbohydrates (starches and sugars).