Sugars are found in all sorts of foods. There are 2 types of sugars - non-reducing and reducing. You can test for reducing sugars in foods using the Benedict's test
1)Prepare a food sample and transfer 5 cm^3 to a test tube
2) Prepare a water bath so that it's set to 75°C
3) Add some Benedict's solution to the test tube (about 10 drops) using a pipette
4) Place the test tube in the water bath using a test tube holder and leave it in there for 5 minutes. Make sure the tube is pointing away from you
5) If the food sample contains a reducing sugar, the solution in the test tube will change from the normal blue colour to green, yellow or brick-red - it depends on how much sugar is in the food