Acrylamide is produced when starchy foods are roasted, fried or grilled for too long at high temperatures. The Food Standards Agency (FSA) recommends carefully following cooking instructions and avoiding browning. However, a Cancer Research spokeswoman said the link was not proven in humans. The FSA also says potatoes should not be kept in the fridge. This is because sugar levels in the potatoes rise at low temperatures, potentially increasing the amount of acrylamide produced during cooking. Acrylamide is present in many different types of food and is a natural by-product of the cooking process. The highest levels of the substance are found in foods with high starch content which have been cooked above 120C, such as crisps, bread, breakfast cereals, biscuits, crackers, cakes and coffee. It can also be produced during home cooking, when high-starch foods – such as potatoes, chips, bread and parsnips – are baked, roasted, grilled or fried at high temperatures. When bread is grilled to make toast, for example, this causes more acrylamide to be produced. The darker the colour of the toast, the more acrylamide is present. During the browning process, the sugar, amino acids and water present in the bread combine to create colour and acrylamide – as well as flavour and aromas. The Food Standards Agency says it is not clear exactly how much acrylamide can be tolerated by people, but it does believe that we are eating too much of it.