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Study: ‘Yo-yo dieting’ represents no adverse effect to metabolism or ability to lose weight long-term

BY Michael Johnsen

SEATTLE — "Yo-yo dieting" — the repetitive loss and regain of body weight — does not negatively affect metabolism or the ability to lose weight long term, researchers at Fred Hutchinson Cancer Research Center reported in a new study published in the journal Metabolism.

“A history of unsuccessful weight loss should not dissuade an individual from future attempts to shed pounds or diminish the role of a healthy diet and regular physical activity in successful weight management,” stated the study’s senior author Anne McTiernan, a member of the Hutchinson Center’s Public Health Sciences Division. “We know there’s an association between obesity, sedentary behavior and increased risk of certain cancers,” McTiernan said. “The World Health Organization estimates that a quarter to a third of cancers could be prevented with maintenance of normal weight and keeping a physically active lifestyle."

The study was based on data from 439 overweight-to-obese, sedentary Seattle-area women, ages 50 to 75 years, who were randomly assigned to one of four groups: reduced-calorie diet only, exercise only (mainly brisk walking), reduced-calorie diet plus exercise and a control group that received no intervention. At the end of the yearlong study, participants on the diet-only and diet-plus-exercise arms lost an average of 10% of their starting weight, which was the goal of the intervention.

The analysis aimed to determine whether women with a history of moderate or severe weight cycling were at a disadvantage compared with nonweight-cyclers when it came to losing weight. Of the study participants overall, 18% met the criteria for severe weight cycling (having reported losing 20 or more pounds on three or more occasions) and 24% met the criteria for moderate weight cycling (having reported losing 10 or more pounds on three or more occasions).

Although severe weight cyclers were, on average, nearly 20 pounds heavier than noncyclers at the start of the study, at the end of the study, the researchers found no significant differences between those who "yo-yo dieted" and those who didn’t with regard to the ability to successfully participate in diet and/or exercise programs. The cyclers also did not differ from the noncyclers with regard to the impact of diet or diet-plus-exercise on weight loss, percentage of body fat and lean muscle mass gained or lost. Other physiological factors, such as blood pressure, insulin sensitivity and blood concentrations of such hormones as leptin (which helps make one feel full) and adiponectin (which helps regulate glucose levels) also did not differ significantly among those whose weight fluctuated and those whose did not.


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J.Tyme says:
Aug-17-2012 09:34 am

I agree with this. Diet is the most important factor. I recently bought a treadmill after reading the reviews on http://treadmillshq.com and some other sites. I have to say after exercising for a few months and changing my diet I can say I see a change. But I knew that the diet is the main thing.

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Leading retailers seek to deliver mobile wallet to consumers

BY Allison Cerra

DALLAS — A new company formed by leading U.S. retailers is looking to offer consumers a mobile commerce experience that will combine the convenience of paying at the register with customizable offers.

The group, Merchant Customer Exchange, initially is focusing on developing and deploying an m-commerce solution that seamlessly integrates a range of consumer offers, promotions and retail programs, which virtually would be available via any smartphone. Retailers participating in the MCX include such companies as CVS/pharmacy, Hy-Vee, Publix, Kmart parent company Sears Holdings, Target and Walmart, among others. Additional members are expected to be announced in the coming months.

"MCX will leverage mobile technology to give consumers a faster and more convenient shopping experience while eliminating unnecessary costs for all stakeholders," Walmart corporate VP and assistant treasurer Mike Cook said. "The MCX platform will employ secure technology to deliver an efficiency-enhancing mobile solution available to all merchant categories, including retail stores, casual dining, petroleum and e-commerce."

For additional information, visit MCX.com.

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Deloitte: Consumer spending slips for first time in five months

BY Katherine Field Boccaccio

NEW YORK — The Deloitte Consumer Spending Index decreased slightly in July, marking the first decline since February 2012.

The index tracks consumer cash flow as an indicator of future consumer spending.

“The Index slipped primarily due to a drop in real new home prices and a slight rise in jobless claims that offset improvements in real wages,” said Carl Steidtmann, Deloitte’s chief economist and author of the monthly Index. “Consumers enjoyed lower energy costs during the first half of the summer, but a rapidly increasing savings rate suggests they have put some recouped funds away for a rainy day rather than spending it. However, gas prices have started to tick back up. If confidence remains under pressure due to stagnant job growth, a stumbling housing market and Europe’s financial crisis, consumer spending may begin to contract heading into autumn.”

Other factors impacting the decline, Deloitte said, included rising interest income and savings rate and lower gas prices since April.

“Consumers responded favorably to markdowns and promotions in July, and we anticipate retailers will finish the summer strong as families restock before sending their children off to school,” said Alison Paul, vice chairman, Deloitte LLP and retail and distribution sector leader. “However, that momentum may be seasonal and temporary if the Index’s decline is more than a blip on the radar.”

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