A lot has been written about the detrimental effects of refined white sugar on the body. It is really very bad for you. Inform yourself because a lot of products contain a lot of refined white sugar. Cola for instance, but also ketchup contains a lot. Try to cut down on it by using brown sugars, like cane sugar.
Sugar has a stimulating effect.
If you consume a product full of sugar you get a kick out of it, that's why products that contain a lot of sugar are so attractive. The stimulating effect of caffeine in cola, coffee, tea, and chocolate are well known. Gives the same kick because it contains the caffeine but is less worse because it does not contain the stomach irritating substances. The stimulation of some diet pills is obvious. A lot of weight loss herbs are stimulatory.