How to detect sugar?

Sugar is an essential ingredient in our food. Sugar belongs to the carbohydrates, is solid and can be dissolved very well in water. Sugar" is understood to be all sweet-tasting carbohydrates such as glucose or fructose. Sugar does not contain any vitamins or minerals, but provides energy in our body as an energy supplier. However, sugar also has negative consequences, which is why the curriculum also provides for dealing with sugar in food and its simple detection methods.