Sugar is glucose and fruit sugar is fructose. We need for sugar metabolism insulin, but fructose is metabolised in the liver.

Many think that only fructose is present in the fruits. In fruits there are fructose, glucose and sucrose. Sucrose has one molecule of glucose and fructose. The fruits thus have approximately equal amount of glucose and fructose. Table sugar is normally sucrose.

High-fructose corn syrup which is present in many soft drinks is usually a mixture of approximately equal amounts of glucose and fructose.

Fructose is metabolised exactly like alcohol and so in excess bad for the liver health.

Both excess glucose and fructose are converted into triglycerides in the liver. We must be careful with sugar as well as with fructose.

Berries, melons, tree fruits are rich in fructose. Honey and some root vegetable also contain significant amount of fructose.