trees use polymerized carbohydrates as their back bones. Actually, that reservoir has the clear of managing world famine taken into wider use, Unfortunately the digestibility of Celulose is low in the human gut, but the cellu- lase technology is well known. Ruminants can use celluloses with the aid of their en bacteria. Some of the sugars of trees are widely used as food components Birch trees contain a lot of pentose sugars. In Finland, the alcohol xylitol has been extensively studied for four decades. Xylitol, like other polyol sweeteners, is a nat urally occurring sugar alcohol. Xylitol is sweet tasting, although the taste is a bit different from that of sucrose. When xylitol is added to candies and chewing gums instead of sucrose, bacterial growth in the mouth remains low compared to sucrose- containing products. In this way, xylitol may effectively manage oral health (64-68) Although there are substantial data on the health benefits of xylitol, this natural sugar cannot be categorized as functional food Xylitol traces in candies or chewing gums short of meeting the basic requirement of functional food