Eat­ing be­fore early work­out helps burn car­bo­hy­drates

The Borneo Post - Nature and health - - Front Page -

IF YOU ex­er­cise in the morn­ing, it may be a good idea to eat break­fast first. small Bri­tish study finds that hav­ing break­fast be­fore a morn­ing work­out trig­gers the body to burn more car­bo­hy­drates dur­ing ex­er­cise and also speeds di­ges­tion af­ter­wards. The study in­cluded 12 healthy men who did an hour of cycling in the morn­ing. They ei­ther had a break­fast of por­ridge made with milk two hours be­fore ex­er­cise, or had break­fast af­ter they ex­er­cised.

The re­searchers tested the blood glu­cose lev­els and mus­cle glyco­gen lev­els of the vol­un­teers. They found that eat­ing break­fast in­creased the rate at which the body burned car­bo­hy­drates dur­ing ex­er­cise, and in­creased the rate the body di­gested and metabolised food eaten af­ter ex­er­cise, too. “This is the first study to ex­am­ine the ways in which break­fast be­fore ex­er­cise in­flu­ences our re­sponses to meals af­ter ex­er­cise,” study co-leader Javier Gon­za­lez, a se­nior lec­turer at the Univer­sity of Bath, said in a school news re­lease.

Study co-leader Rob Edinburgh is a doc­tor- ate stu­dent at the univer­sity. “We also found that break­fast be­fore ex­er­cise in­creases car­bo­hy­drate burn­ing dur­ing ex­er­cise, and that this car­bo­hy­drate wasn’t just com­ing from the break­fast that was just eaten, but also from car­bo­hy­drate stored in our mus­cles as glyco­gen,” he said. “This in­crease in the use of mus­cle glyco­gen may ex­plain why there was more rapid clear­ance of blood sugar af­ter ‘lunch’ when break­fast had been con­sumed be­fore ex­er­cise,” Edinburgh said.

“This study sug­gests that, at least af­ter a sin­gle bout of ex­er­cise, eat­ing break­fast be­fore ex­er­cise may ‘prime’ our body, ready for rapid stor­age of nu­tri­tion when we eat meals af­ter ex­er­cise,” he added. The study was pub­lished in the Amer­i­can Jour­nal of Phys­i­ol­ogy: En­docrinol­ogy and Me­tab­o­lism. “As this study only as­sessed the short-term re­sponses to break­fast and ex­er­cise, the longer-term im­pli­ca­tions of this work are un­clear, and we have on­go­ing stud­ies look­ing at whether eat­ing break­fast be­fore or af­ter ex­er­cise on a reg­u­lar ba­sis in­flu­ences health,” Edinburgh noted.

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