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Scientists have discovered that fructose, a naturally occurring sugar, is a major driver obesity. Fructose is also known as "fruit sugar". It occurs to varying degrees fruit and vegetables. It is also used processed form high fructose corn syrup, which is in a lot the food we eat, and promotes obesity. A study led Dr Richard Johnson the University of Colorado found that although fructose isn't the biggest source calorific intake, it stimulates an urge to eat fattier food. Researchers posited a shift of focus what we eat. They wrote: "All hypotheses recognize the importance of reducing 'junk' foods, [however] it remains unclear whether the focus should be reducing [fructose] intake."

Dr Johnson and his colleagues conducted an exhaustive study all known contributors to obesity. They found that the process our body converting fructose energy causes a drop the levels a compound called ATP. When ATP falls, our body tells us to eat more. Researchers call this process the fructose survival hypothesis. Johnson said: "Fructose is what triggers our metabolism to go low power mode and lose our control of appetite, but fatty foods become the major source calories that drive weight gain." Scientists have attributed the consumption high amounts fructose to health issues. The most common these is non-alcoholic fatty liver disease.

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