FRUC­TOSE MAKES YOU FAT­TER AND LAZIER

Australian Natural Bodz - - Nutrition Knowledge Centre -

If you con­sume large amounts of sugar you’ll not only get fat­ter, you’ll also get fat­ter faster than if you con­sume large amounts of glu­cose. That’s be­cause fruc­tose – one of the com­po­nents of sugar – makes you lazy, which means you move less. Nu­tri­tion­ists at the Univer­sity of Illi­nois at Ur­bana­Cham­paign dis­cov­ered this when they stud­ied the ef­fect of a high­fruc­tose diet on mice. Glu­cose, fruc­tose and sugar You prob­a­bly know al­ready, but we’ll re­peat it just in case. Thanks to the food in­dus­try we con­sume too much re­fined car­bo­hy­drates. These are not healthy for us and the un­health­i­est of all re­fined car­bo­hy­drates are su­crose and fruc­tose. Fruc­tose is a com­po­nent of su­crose, or­di­nary sugar, but an in­creas­ing num­ber of foods also con­tain fruc­tose alone. Fruc­tose is a com­po­nent, for ex­am­ple, of High Fruc­tose Corn Syrup ( HFCS). Re­searchers like Robert Lustig have been warn­ing for years about the con­se­quences of a high fruc­tose in­take. Fruc­tose doesn’t con­vert eas­ily into glu­cose. It’s glu­cose that stim­u­lates the pro­duc­tion of in­sulin, the hor­mone that in­duces cells to ab­sorb glu­cose. With fruc­tose the process doesn’t go so smoothly, so fruc­tose tends to hang around more in the blood­stream. As a re­sult, a diet that con­tains a lot of fruc­tose is more likely to lead to di­a­betes, car­dio­vas­cu­lar dis­ease and over­weight than a diet that con­tains a lot of glu­cose. The an­i­mal study done at the Univer­sity of Illi­nois at Ur­bana­Cham­paign, which was re­cently pub­lished in sci­en­tific Re­ports, con­firms the dan­gers of our cur­rent in­take lev­els of fruc­tose. Study The re­searchers gave mice food that con­tained 180g fruc­tose per kg for 11 weeks. The food was an im­i­ta­tion of the diet of heavy con­sumers of fruc­tose. A con­trol group was given food that con­tained 180 g glu­cose per kg. Re­sults The mice in both groups put on weight, but the fruc­tose mice be­came fat­ter than the mice in the glu­cose group. The re­searchers used cam­eras to mon­i­tor how much the mice moved around in their cages at night [ mice are noc­tur­nal an­i­mals]. They ob­served that the mice in both groups started to move less when the ex­per­i­ment be­gan. But the de­crease in move­ment was big­ger in the fruc­tose group than in the glu­cose group. Con­clu­sion “In sup­port of our ob­ser­va­tions, a re­cent study re­ported that in­ges­tion of fruc­tose ( 25% en­ergy in­take, 10 weeks) in hu­man vol­un­teers also re­sulted in re­duced en­ergy ex­pen­di­ture in re­la­tion to a diet with the same glu­cose dose”, the re­searchers wrote. [ Eur J Clin Nutr. 2012 Feb;66( 2): 201­8.] “Such changes in en­ergy ex­pen­di­ture are likely to have im­por­tant im­pli­ca­tions in re­gard to reg­u­la­tion of body weight and en­ergy bal­ance in long­term con­sump­tion of fruc­tose. It is re­al­is­tic to con­sider an in­crease in phys­i­cal ac­tiv­ity as a way to ab­late the po­ten­tial neg­a­tive im­pact of fruc­tose con­sump­tion in body weight.”

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