Sugar when added to water makes water sweeter.It is harmful for diabetics and helpful to their heirs.
Sugar crystals interact with water via hydrogen bonds- weak bonds that take place primarily between positively-charged hydrogen atoms and negatively-charged oxygen atoms. The two substances interact freely when combined. Water molecules surround individual molecules of sugar, breaking the bonds between sugar particles until the crystals are either fully dissolved, or until there are no 'free' water molecules left. When this occurs, the sugar crystals do not fully dissolve. Hydrogen bonds are so weak that they are constantly breaking and reforming, causing individual molecules to exchange positions. Because energy is required to break and form bonds, and heat is a form of energy, the warmer the water, the more readily the sugar dissolves.
Water with sugar in it has lower freezing and higher boiling points than pure water.