Want to lower your salt intake, but still love salt? Want to lower your sugar intake but still love sugar?
Because the cooking process causes the sweet or salty tastes to fade, put less salt/sugar (or none) before and during the cooking process and add salt/sugar -- (the less refined the salt or sugar, the less you'll need to use) at end.
1/4 cup of coarse baker's sugar on top of a cake will add far more sweet pleasure to the palate than a cup of sugar in the batter! As for salt . . . just think about that coarse salt on the surface of a pretzel!
Experiment and see what works for you! But do experiment. You'll be surprised at the results.