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General interest items edited by Janice Flahiff

Many health impacts of aging are due to inactivity—not getting old [Reblog]

Many health impacts of aging are due to inactivity—not getting old.

From the 2 June 2015 post at The Longevity Network

 

This past winter I taught a course titled “Physical Activity and Aging.” It was a fun course, and really drove home an issue that I’ve known for a while, but hadn’t previously given a lot of thought: the impact of aging is identical to the detraining that happens in response to reduced physical activity and/or increased sedentary behaviour.

Aging is associated with reduced fitness, weaker bones, reduced insulin sensitivity, reduced muscle strength, and reduced balance. Lack of  is also associated with all of those things. This isn’t a coincidence – many (probably most) of the health impacts of aging are not really due to aging at all.

You see, there are 2 types of aging. Eugeric aging, which you can think of as “true” aging. The stuff you simply cannot avoid as you get older (e.g. hearing loss, or reduced eyesight).

– See more at: http://www.longevitynetwork.org/news/many-health-impacts-of-aging-are-due-to-inactivity-not-getting-old/#sthash.MXcqsEDG.dpuf

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July 21, 2015 Posted by | Health News Items | , , , , | Leave a comment

Researchers find fructose contributes to weight gain, physical inactivity, and body fat

Researchers find fructose contributes to weight gain, physical inactivity, and body fat.
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From the 1 June 2015 University of Illinois news release

n the last 40 years, fructose, a simple carbohydrate derived from fruit and vegetables, has been on the increase in American diets. Because of the addition of high-fructose corn syrup to many soft drinks and processed baked goods, fructose currently accounts for 10 percent of caloric intake for U.S. citizens. Male adolescents are the top fructose consumers, deriving between 15 to 23 percent of their calories from fructose–three to four times more than the maximum levels recommended by the American Heart Association.

A recent study found that, matched calorie for calorie with the simple sugar glucose, fructose causes significant weight gain, physical inactivity, and body fat deposition.

“The important thing to note is that animals in both experimental groups had the usual intake of calories for a mouse,” said Rendeiro. “They were not eating more than they should, and both groups had exactly the same amount of calories deriving from sugar, the only difference was the type of sugar, either fructose or glucose.”

The results showed that the fructose-fed mice displayed significantly increased body weight, liver mass, and fat mass in comparison to the glucose-fed mice.

“In previous studies, the increases in fructose consumption were accompanied by increases in overall food intake, so it is difficult to know whether the animals put on weight due to the fructose itself or simply because they were eating more,” Rhodes said.

Remarkably, the researchers also found that not only were the fructose-fed mice gaining weight, they were also less active.

“We don’t know why animals move less when in the fructose diet,” said Rhodes. “However, we estimated that the reduction in physical activity could account for most of the weight gain.”

“Biochemical factors could also come into play in how the mice respond to the high fructose diet,” explained Jonathan Mun, another author on the study. “We know that contrary to glucose, fructose bypasses certain metabolic steps that result in an increase in fat formation, especially in adipose tissue and liver.”

July 20, 2015 Posted by | Nutrition | , , , , , , , , , | Leave a comment

   

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