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How Much Exercise to Burn Off a Burger?

How Much Exercise to Burn Off a Burger?
By Chris Kaiser, Cardiology Editor, MedPage Today, Published: April 24, 2013

Menus displaying the amount of exercise required to burn off calories in a meal had some impact on food choice, researchers found.

Individuals given menus with the exercise information not only ordered food with fewer calories compared with those given menus without such information (763 versus 902 kcal, P=0.002), they also consumed fewer calories (673 versus 770, P=0.01), according to Ashlei James, a graduate student at Texas Christian University in Fort Worth, Texas, and colleagues.

However, there was no difference in calories ordered (P=0.15) and consumed (P=0.19) between those whose menus had exercise information and those whose menus contained calorie counts, James reported at the Experimental Biology 2013 meeting in Boston.
Similarly, menus with and without calorie counts did not lead to differences in calories ordered or consumed (P=0.09 and P=0.21, respectively), the researchers found.

"This is the first study to look at the effects of displaying minutes of brisk walking needed to burn food calories on the calories ordered and consumed," said senior researcher Meena Shah, PhD, in a statement.

She noted that the volunteers were quite surprised at the amount of exercise required to burn calories. For example, a quarter-pound double cheeseburger requires 2 hours of brisk walking for a woman to burn the calories.

As more restaurants have begun to include calorie information on their menus, voluntarily or by law, consumers have become more calorie conscious about their choice of menu items. "The majority of studies, however, show that providing information on calorie content does not lead to fewer calories ordered or consumed," researchers noted.


Satiety & Obesity: Not just calories in and calories out

Different Sugars Have Different Effects on Brain

By Kristina Fiore, Staff Writer, MedPage Today, Published: January 02, 2013
Reviewed by Zalman S. Agus, MD; Emeritus Professor, Perelman School of Medicine at the University of Pennsylvania and Dorothy Caputo, MA, BSN, RN, Nurse Planner

Glucose appears to tamper brain activity in regions that regulate appetite and reward -- but fructose does not, researchers found.

In a brain imaging study, participants who had a drink sweetened with glucose had significant reductions in cerebral blood flow in the hypothalamus, while those who drank a fructose-sweetened drink saw a slight increase in activity (P=0.01), Robert Sherwin, MD, of Yale University, and colleagues reported in the Jan. 2 issue of the Journal of the American Medical Association.

Glucose also reduced activation in the insula and striatum, other brain regions that regulate appetite, motivation, and reward processing, while fructose did not, the researchers wrote.

In an accompanying editorial, Jonathan Purnell, MD, and Damien Fair, PhD, of Oregon Health & Science University in Portland, said the findings "support the conceptual framework that when the human brain is exposed to fructose, neurobiological pathways involved in appetite regulation are modulated, thereby promoting increased food intake."

As the obesity epidemic has grown, so too has consumption of fructose in the American diet, the researchers explained in their article. Fructose is found in both sucrose, or table sugar, and in high-fructose corn syrup, another common sweetener. It is valued because it's sweeter than glucose.


Fat But Fit: The 'Obesity Paradox'

'Fitness and fatness': Not all obese people have the same prognosis: Second study sheds light on the 'obesity paradox'

Contact: Emma Mason, European Society of Cardiology, Public release date: 4-Sep-2012

People can be obese but metabolically healthy and fit, with no greater risk of developing or dying from cardiovascular disease or cancer than normal weight people, according to the largest study ever to have investigated this, which is published online today (Wednesday) in the European Heart Journal [1].

The findings show there is a subset of obese people who are metabolically healthy – they don't suffer from conditions such as insulin resistance, diabetes and high cholesterol or blood pressure – and who have a higher level of fitness, as measured by how well the heart and lungs perform, than other obese people. Being obese does not seem to have a detrimental effect on their health, and doctors should bear this in mind when considering what, if any, interventions are required, say the researchers.

"It is well known that obesity is linked to a large number of chronic disease such as cardiovascular problems and cancer. However, there appears to be a sub-set of obese people who seem to be protected from obesity-related metabolic complications," said the first author of the study, Dr Francisco Ortega (PhD). "They may have greater cardio-respiratory fitness than other obese individuals, but, until now, it was not known the extent to which these metabolically healthy but obese people are at lower risk of diseases or premature death."

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