<P> Carbohydrates are typically stored as long polymers of glucose molecules with glycosidic bonds for structural support (e.g. chitin, cellulose) or for energy storage (e.g. glycogen, starch). However, the strong affinity of most carbohydrates for water makes storage of large quantities of carbohydrates inefficient due to the large molecular weight of the solvated water - carbohydrate complex . In most organisms, excess carbohydrates are regularly catabolised to form acetyl - CoA, which is a feed stock for the fatty acid synthesis pathway; fatty acids, triglycerides, and other lipids are commonly used for long - term energy storage . The hydrophobic character of lipids makes them a much more compact form of energy storage than hydrophilic carbohydrates . However, animals, including humans, lack the necessary enzymatic machinery and so do not synthesize glucose from lipids (with a few exceptions, e.g. glycerol). </P> <P> In some animals (such as termites) and some microorganisms (such as protists and bacteria), cellulose can be disassembled during digestion and absorbed as glucose . </P> <Ul> <Li> Diabetes mellitus </Li> <Li> Lactose intolerance </Li> <Li> Fructose malabsorption </Li> <Li> Galactosemia </Li> <Li> Glycogen storage disease </Li> </Ul> <Li> Glycogen storage disease </Li>

11) a hormone that is not involved in glucose metabolism is