The organisation rebuked manufacturers for inadequate labelling with the potential to mislead consumers and leave them ignorant of the sugar levels in some well-known brands - some of which exceed the amount recommended by the UK's Food Standards Agency (FSA). According to the Which? research, a WeightWatchers oat digestive biscuit contains 20.5g of sugar in 100g, - 4 per cent more than market heavyweight brand, McVitie's digestives. Alpen raspberry with yoghurt snack bar contains 36.1g sugar per 100g while the breakfast cereal, Kellogg's Crunchy Nut Cornflakes contains 35g of sugar per 100g. The FSA classify a sugar content of over 10g of sugar per 100g as 'a lot' and, under its signpost labelling scheme, give a red light to products with a sugar content over 15g per 100g. Exact labelling of a product's sugar content is voluntary unless the item has been specifically marketed as a 'low sugar' option. Which? magazine editor Neil Fowler said: "It's no wonder if people are baffled about the amount of sugar they're consuming. Although many companies do voluntarily label their products, not all do. "We support the FSA's front of pack traffic light labelling scheme, but manufacturers need to raise their game and put full nutrition information on the back of packs too."