We have all inherited a sweet tooth from our distant ancestors who lived in the forest and fed mostly on fruits a very long time ago. And this is the reason why fruits with all their natural sugars are not harmful to us, although overindulgence may increase our weight. But most modern sweets are made by the addition of sugar, and that is something else.
Modest amounts of naturally sweet substances like unprocessed honey, pure maple syrup. unsulfured blackstrap molasses, concentrated grape syrup, stevia.

All granulated sugars of whatever color; sugar candy; corn and other syrups; sugar substitutes and artificial sweeteners; jams, jellies and marmalades made with sugar.