First it is important to remember, that when reading the list of ingredients. Always the more at the beginning it appears, it is because the greater its quantity.
With what other names can we find sugar in products?
Fructose Syrup, Glucose Syrup and Agave Syrup
cane crystals
Fructose
Saccharose
brown sugar
Maltose
Syrup
Candy.
Many Products on their packaging tell us "SUGAR FREE" but add it with the names indicated above.

This is why it is important to read the ingredients.