Linked from
The 12 pages that link to Reducing sugar, each with the reason it gives.
PolysaccharideRelated: A chain’s terminal sugar may retain a free anomeric carbon.
AnomerRelated: A free anomeric center allows ring opening and interconversion of anomers.
AldoseRelated: Most aldoses act as reducing sugars because their rings can open to aldehydes.
AcrylamideRelated: Reducing sugars react with asparagine along pathways that form acrylamide.
French friesRelated: Excess reducing sugars can make fries dark and bitter during frying.