Yo-yo di­et­ing could in­crease risk of death

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

NEW RE­SEARCH in South Korea has found that weight cy­cling, which is a term for con­stantly los­ing and gain­ing weight, usu­ally due to diet, is as­so­ci­ated with a higher risk of death. Con­ducted by re­searchers at Seoul Na­tional Uni­ver­sity (SNU) Col­lege of Medicine, Seoul Na­tional Uni­ver­sity Bun­dang Hospi­tal and Ajou Uni­ver­sity School of Medicine, Korea, the new study looked at 3,678 Korean men and women and fol­lowed them for a pe­riod of 16 years. Dur­ing this time, the re­searchers col­lected data on the par­tic­i­pants’ body weight and any health-re­lated out­comes every two years, to see if weight had any ef­fect on the in­ci­dence of di­a­betes and car­dio­vas­cu­lar events. The find­ings, pub­lished in the En­docrine So­ci­ety’s Jour­nal of Clin­i­cal En­docrinol­ogy & Me­tab­o­lism, showed that par­tic­i­pants whose weight fluc­tu­ated the most were more likely to be obese, have higher blood pres­sure, and higher HbA1c lev­els -- which are as­so­ci­ated with an in­creased risk of di­a­betes -- at the start of the study than those whose weight didn’t fluc­tu­ate as much. In ad­di­tion, the re­searchers also found that weight cy­cling was as­so­ci­ated with a higher risk of death. How­ever, peo­ple with obe­sity who ex­pe­ri­enced more weight cy­cling were ac­tu­ally less likely to de­velop di­a­betes than other study par­tic­i­pants. The team sug­gested that the health ben­e­fits of weight loss may help off­set the neg­a­tive ef­fects of weight cy­cling for obese in­di­vid­u­als look­ing to lower their di­a­betes risk. There was no as­so­ci­a­tion be­tween weight cy­cling and car­dio­vas­cu­lar event. The re­searchers also noted that pre­vi­ous re­search has also linked weight cy­cling with higher mor­tal­ity and car­dio­vas­cu­lar events in pa­tients with coro­nary artery dis­ease. “This study shows that weight cy­cling can heighten a per­son’s risk of death,” said lead study au­thor Dr Hak C. Jang. “How­ever, we also con­cluded that weight loss as a re­sult of weight cy­cling can ul­ti­mately re­duce the risk of de­vel­op­ing di­a­betes in peo­ple with obe­sity.” Ac­cord­ing to the team, some es­ti­mates sug­gest that around 80 per cent of peo­ple who lose weight will grad­u­ally re­gain it, end­ing up at the same weight as they were be­fore the diet, or even heav­ier. The En­docrine So­ci­ety’s Sci­en­tific State­ment on what causes obe­sity has found that this is be­cause af­ter weight loss, the body usu­ally re­duces the amount of en­ergy it uses when at rest, dur­ing ex­er­cise and daily ac­tiv­i­ties, but in­creases hunger, cre­at­ing con­di­tions for weight gain. – Re­laxnews

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