Thursday, April 30, 2009

Get a Grip on Insulin's Ups and Downs:
-By Jillian Michaels
One of the endocrine system's most important hormones is insulin, which plays a critical role in how your body uses food. When you eat, your digestive system breaks food down into glucose, and the glucose circulates in your bloodstream (where it's often referred to as blood sugar). In response to the rise in glucose after a meal, the pancreas releases surges of insulin, whose job is to clean the glucose from the blood. Insulin directs some of the glucose to the body's cells, which use it for energy. Some of the glucose is diverted to the liver, where it's converted into glycogen (stored glucose) for later use by the muscles. Insulin then helps turn any leftover glucose into fatty acids and stores them in fat cells, where they can be tapped later for fuel. Problems arise when your body starts creating too much insulin, which can happen for several reasons. One of the most common is that you ate too many highly processed, refined carbs, such as white bread or pasta. Such carbs increase blood sugar dramatically, requiring a rush of insulin to clear the blood. If your blood sugar surge is really dramatic (as it would be if you ate those refined carbs on an empty stomach), insulin overreacts and works twice as hard to clean the sugar from the blood. This overefficient removal of sugar means that your blood sugar concentration drops, with the result that you feel hungry again and crave (and probably eat) more carbs. That's the postsugar "crash and binge" cycle, the root of sugar addiction. In addition, when your muscles are still fueled from your last snack, the insulin converts those extra calories into fat. And as long as large amounts of insulin remain in the bloodstream, your body won't have a chance to tap into your fat stores for fuel — so you won't burn any fat, either.

This cycle can eventually lead to insulin resistance, a condition in which your body produces insulin but the cells become insensitive to it — as a result, the insulin can't do its job to lower the glucose concentration in the blood. Insulin resistance is a precursor of type 2 diabetes and is common among overweight people. Elevated levels of glucose in your blood is a surefire sign of it.

There is hope for preventing the problem. The key is to maintain low levels of insulin by eating whole foods, pairing carbs with protein, and avoiding highly processed carbs. When your insulin-release mechanism works the right way, it helps keep your weight in check. When it's not working, you're in trouble. If you can take control of your insulin's ups and downs, you'll be primed to lose weight and restore your body's hormone power!

Thursday, April 2, 2009

Study Finds High-Fructose Corn Syrup Contains Mercury (HealthDay News)

-- 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 HFCS is the first- or second-highest labeled ingredient, according to two new U.S. studies.

HFCS 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.

In the first study, published in current issue of Environmental Health, researchers found detectable levels of mercury in nine of 20 samples of commercial HFCS.

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 HFCS-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 HFCS 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.

More information

The U.S. Agency for Toxic Substances & Disease Registry has more about mercury and health.

SOURCE: Institute for Agriculture and Trade Policy, news release, Jan. 26, 2009