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Sugar. Coloured scanning electron micrograph (SEM) of crystals of sucrose or saccharose, also known as cane or beet sugar. Sucrose sugar is easily digested and forms a major source of energy in humans. It is both a sweetener and a preservative, and is used in cooking and the food industry. A high consumption is associated with obesity and tooth decay. Magnification:x 26 at 6x7cm size. x40 at 4x5 inch size. (KEYSTONE/SCIENCE PHOTO LIBRARY/EYE OF SCIENCE)