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High Fructose Corn Syrup:
What are the concerns about high-fructose corn syrup?
High-fructose corn syrup is a common sweetener and preservative. High-fructose corn syrup is made by changing the sugar (glucose) in cornstarch to fructose — another form of sugar. Because it extends the shelf life of processed foods and is cheaper than sugar, high-fructose corn syrup has become a popular ingredient in many sodas, fruit-flavored drinks and other processed foods.
So far, research has yielded conflicting results about the effects of high-fructose corn syrup. For example, various early studies showed an association between increased consumption of sweetened beverages (many of which contained high-fructose corn syrup) and obesity. Many beverages and other processed foods made with high-fructose corn syrup and other sweeteners are high in calories and low in nutritional value. Regularly including these products in your diet has the potential to promote obesity — which, in turn, promotes conditions such as type 2 diabetes, high blood pressure and coronary artery disease.
If you're concerned about the amount of high-fructose corn syrup or other sweeteners in your diet, consider these tips:
* Limit processed foods.
* Avoid foods that contain added sugar.
* Choose fresh fruit rather than fruit juice or fruit-flavored drinks. Even 100 percent fruit juice has a high concentration of sugar.
* Drink less soda.
High Fructose Corn Syrup
High-fructose corn syrup prompts considerably more weight gain
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In addition to causing significant weight gain in lab animals, long-term consumption of high-fructose corn syrup also led to abnormal increases in body fat, especially in the abdomen, and a rise in circulating blood fats called triglycerides. "When rats are drinking high-fructose corn syrup at levels well below those in soda pop, they're becoming obese -- every single one, across the board. Hoebel lab
The first study showed that male rats given water sweetened with high-fructose corn syrup in addition to a standard diet of rat chow gained much more weight than male rats that received water sweetened with table sugar, or sucrose, in conjunction with the standard diet. The concentration of sugar in the sucrose solution was the same as is found in some commercial soft drinks, while the high-fructose corn syrup solution was half as concentrated as most sodas.
The second experiment -- the first long-term study of the effects of high-fructose corn syrup consumption on obesity in lab animals -- monitored weight gain, body fat and triglyceride levels in rats with access to high-fructose corn syrup over a period of six months. Male rats in particular ballooned in size: Animals with access to high-fructose corn syrup gained 48 percent more weight than those eating a normal diet.
"These rats aren't just getting fat; they're demonstrating characteristics of obesity, including substantial increases in abdominal fat and circulating triglycerides," said
Hoebel lab
When male rats were given water sweetened with high-fructose corn syrup in addition to a standard diet of rat chow, the animals gained much more weight than male rats that received water sweetened with table sugar, or sucrose, along with the standard diet. High-fructose corn syrup and sucrose are both compounds that contain the simple sugars fructose and glucose, but there at least two clear differences between them.
First, sucrose is composed of equal amounts of the two simple sugars -- it is 50 percent fructose and 50 percent glucose -- but the typical high-fructose corn syrup used in this study features a slightly imbalanced ratio, containing 55 percent fructose and 42 percent glucose. Larger sugar molecules called higher saccharides make up the remaining 3 percent of the sweetener.
Second, as a result of the manufacturing process for high-fructose corn syrup, the fructose molecules in the sweetener are free and unbound, ready for absorption and utilization. The rats in the
Study Finds High-Fructose Corn Syrup Contains Mercury
Almost half of tested samples of commercial high-fructose corn syrup (HFCS) contained mercury, which was also found in nearly a third of 55 popular brand-name food and beverage products where high-fructose corn syrup is the first- or second-highest labeled ingredient, according to two new U.S. studies.
High-fructose corn syrup has replaced sugar as the sweetener in many beverages and foods such as breads, cereals, breakfast bars, lunch meats, yogurts, soups and condiments. On average, Americans consume about 12 teaspoons per day of HFCS, but teens and other high consumers can take in 80 percent more HFCS than average.
"Mercury is toxic in all its forms. Given how much high-fructose corn syrup is consumed by children, it could be a significant additional source of mercury never before considered. We are calling for immediate changes by industry and the [U.S. Food and Drug Administration] to help stop this avoidable mercury contamination of the food supply," the Institute for Agriculture and Trade Policy's Dr. David Wallinga, a co-author of both studies, said in a prepared statement.
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In the first study, published in current issue of Environmental Health, researchers found detectable levels of mercury in nine of 20 samples of commercial high-fructose corn syrup.
And in the second study, the Institute for Agriculture and Trade Policy (IATP), a non-profit watchdog group, found that nearly one in three of 55 brand-name foods contained mercury. The chemical was found most commonly in high-fructose corn syrup-containing dairy products, dressings and condiments.
But an organization representing the refiners is disputing the results published in Environmental Health.
"This study appears to be based on outdated information of dubious significance," said Audrae Erickson, president of the Corn Refiners Association, in a statement. "Our industry has used mercury-free versions of the two re-agents mentioned in the study, hydrochloric acid and caustic soda, for several years. These mercury-free re-agents perform important functions, including adjusting pH balances."
However, the IATP told the Minneapolis Star Tribune that four plants in Georgia, Tennessee, Ohio and West Virginia still use "mercury-cell" technology that can lead to contamination.
IATP's Ben Lilliston also told HealthDay that the Environmental Health findings were based on information gathered by the FDA in 2005.
And the group's own study, while not peer-reviewed, was based on products "bought off the shelf in the autumn of 2008," Lilliston added.
The use of mercury-contaminated caustic soda in the production of HFCS is common. The contamination occurs when mercury cells are used to produce caustic soda.
"The bad news is that nobody knows whether or not their soda or snack food contains high-fructose corn syrup made from ingredients like caustic soda contaminated with mercury. The good news is that mercury-free HFCS ingredients exist. Food companies just need a good push to only use those ingredients," Wallinga said in his prepared statement.
High Fructose Corn Syrup...
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