Eating sweets may decrease the production of the stress-related hormone glucocorticoid. This hormone has been linked both to obesity and to decreased immune response.
Researchers gave adult male rats small amounts of sugar drink, artificially sweetened drink, or water. After two weeks, the rats were given a physical and psychological stress challenge.
Rats on the sugar drink regimen produced lower glucocorticoid levels than those that drank either the water or the artificially sweetened beverage.
The next step in the research will be to determine exactly how the sweetened drinks are decreasing glucocorticoid production, including whether there are parts of the brain that control response to stress, and if they are affected by sugar.