When too much sugar is used, fruits shrink and become firm. Too much sugar hides true fruit flavor. Sugar increases transparency, which brightens the color of fruit. It also gives a sweet flavor. Fat increases tenderness.
Salt adds flavor.
Reduced fat may make cookies less tender. Reduced salt may affect the flavor slightly. The consistency of custard or pudding will be stiffer and the baking time may be shorter with less sugar. Reduced salt may affect flavor. It also gives a rich flavor.