How to reduce the amount of sugar in daily life?

Nowadays it is widely accepted to vary and flavour the dishes as much as possible to satisfy the consumers‘ interests. Manufacturers add various preservatives, additives and other extra chemicals, however, there are often used substances such as sugar that is also harmful to our body and its uncontrolled big amounts can damage our metabolism. But what can be done to reduce the quantity of sugar consuming and to deal with this problem?