Sugar is valuable to the body as a source of heat and energy. While it
is easy of digestion, it is very irritating to the body if taken in
large quantities and, on this account, it should be taken in small
quantities and preferably at meal time or with other food. Two or three
pieces of candy taken at the end of the meal will not be hurtful, but
when eaten habitually between meals, it is sure to produce harmful
effects.
Sugar is present in many fruits and in most vegetables. Milk contains a
large percentage of sugar. In preparing foods to which the addition of
sugar seems desirable, care should be taken not to add it in large
quantities.