hello. i m vishala sri pathma. world health experts say the advice on how much of an artificial sweetener we can consume remains unchanged. this is despite the sweetener, called aspartame, which is widely used in food and drink, being seen as possibly causing cancer. two groups of experts at the world health organization have been reviewing thousands of scientific studies, as our medical editor fergus walsh explains. aspartame is found in thousands of products. most commonly in sugar free drinks, but also some toothpaste, yoghurts and cough sweets. it is 200 times sweeter than sugar, so you get the sweet taste for a fraction of the calories. a who