Asda's and Morrisons' Golden Puffs were the worst offenders, reports BBC News. Both cereals contained 55g sugar per 100g.
The fat in Jordan's Crispy Nut Four combo "is the same amount per serving as a McDonald's McBacon roll" according to the report.
Researchers also found that almost 90 percent of the cereals aimed at children were high in sugar.
The healthiest cereals included Nestle Shredded Wheat, Quaker Puffed Wheat, Tesco Value Wheat Biscuits and Sainsbury's Basic Muesli.
Cereal manufacturers defended their products saying that they contribute a "nutritionally insignificant" amount of fat to the average diet.
"There is no evidence to show that breakfast cereals make a significant contribution to energy, fat or sugar in the diet of the UK population", a spokesman told the Daily Telegraph.
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BBC News, Daily Telegraph, Wed 19 Jul 2006 at 10:57am