Spices protect against the consequences of high blood sugar

Herbs and spices are rich in antioxidants, and a new University of Georgia study suggests they are also potent inhibitors of tissue damage and inflammation caused by high levels of blood sugar.

Researchers, whose results appear in the current issue of the Journal of Medicinal Food, tested extracts from 24 common herbs and spices. In addition to finding high levels of antioxidant-rich compounds known as phenols, they revealed a direct correlation between phenol content and the ability of the extracts to block the formation of compounds that contribute to damage caused by diabetes and aging.

“Because herbs and spices have a very low calorie content and are relatively inexpensive, they’re a great way to get a lot of antioxidant and anti-inflammatory power into your diet,” said study co-author James Hargrove, associate professor of foods and nutrition in the UGA College of Family and Consumer Sciences.

Hargrove explained that when blood sugar levels are high, a process known as protein glycation occurs in which the sugar bonds with proteins to eventually form what are known as advanced glycation end products, also known as AGE compounds. The acronym is fitting because these compounds activate the immune system, resulting in the inflammation and tissue damage associated with aging and diabetes.

The researchers found a strong and direct correlation between the phenol content of common herbs and spices and their ability to inhibit the formation of AGE compounds. Spices such as cloves and cinnamon had phenol levels that were 30 percent and 18 percent of dry weight, respectively, while herbs such as oregano and sage were eight and six percent phenol by dry weight, respectively. For comparison, blueberries – which are widely touted for their antioxidant capabilities – contain roughly five percent phenol by dry weight.

Study co-author Diane Hartle, associate professor in the UGA College of Pharmacy, said various phenols are absorbed differently by the body and have different mechanisms of action, so it’s likely that a variety of spices will provide maximum benefit.

“If you set up a good herb and spice cabinet and season your food liberally, you could double or even triple the medicinal value of your meal without increasing the caloric content,” she said.

She added that controlling blood sugar and the formation of AGE compounds can also decrease the risk of cardiovascular damage associated with diabetes and aging. She explained that high blood sugar accelerates heart disease partly because AGE compounds form in the blood and in the walls of blood vessels. The AGE compounds aggravate atherosclerosis, which produces cholesterol plaques.

The UGA researchers tested for the ability to block AGE compounds in a test tube, but animal studies conducted on the health benefits of spices lend support to their argument. Cinnamon and cinnamon extracts, for example, have been shown to lower blood sugar in mice. Interestingly, cinnamon lowers blood sugar by acting on several different levels, Hargrove said. It slows the emptying of the stomach to reduce sharp rises in blood sugar following meals and improves the effectiveness, or sensitivity, of insulin. It also enhances antioxidant defenses.

Hargrove said their findings suggest it’s likely that the herbs and spices they studied will provide similar benefits in animal tests. He points out that because humans have been consuming herbs and spices for thousands of years, they come without the risk of possible side effects that accompany medications.

“Culinary herbs and spices are all generally recognized as safe and have been time-tested in the diet,” he said. “Indeed, some of spices and herbals are now sold as food supplements because of their recognized health benefits.”

Study co-author Phillip Greenspan, associate professor in the College of Pharmacy, noted that most people don’t get their recommended five to nine servings of fruits and vegetables a day. Rather than seasoning their food with salt – which provides no beneficial phenols and has been linked to high blood pressure – he recommends that people use a variety of herbs and spices to help boost the nutritional quality of their meals.

“When you add herbs and spices to food, you definitely provide yourself with additional benefits besides taste,” Greenspan said.

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Article adapted by MD Only from original press release.
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Contact: Sam Fahmy
University of Georgia

Herb works like modern-day prescription drugs used to treat diabetes, study suggest

An herb used in traditional Indian medicine to treat diabetes seems to lower blood sugar and insulin levels in a manner similar to prescription drugs, a new study reports.Researchers gave extracts of the herb Salacia oblonga to 39 healthy adults, and the results were promising. The largest dose of the herb extract – 1,000 milligrams – decreased insulin and blood glucose levels by 29 and 23 percent, respectively.

“These kinds of reductions are similar to what we might see with prescription oral medications for people with diabetes,” said Steve Hertzler, a study co-author and an assistant professor of nutrition at Ohio State University.

Salacia oblonga, which is native to regions of India and Sri Lanka, binds to intestinal enzymes that break down carbohydrates in the body. These enzymes, called alpha-glucosidases, turn carbohydrates into glucose, the sugar that circulates throughout the body. If the enzyme binds to the herbal extract rather than to a carbohydrate, then less glucose gets into the blood stream, resulting in lowered blood glucose and insulin levels.

“Lowering blood glucose levels lowers the risk of disease-related complications in people with diabetes,” Hertzler said. “Also, poor compliance with diabetes medications often hinders the effectiveness of these drugs. It may be easier to get someone to take an herb with food or in a beverage, as opposed to a pill.”

The study appears in a recent issue of the Journal of the American Dietetic Association.

Thirty-nine healthy adults participated in four separate meal tolerance tests. These meals, which were given in beverage form, were spaced three to 14 days apart. Each participant fasted for at least 10 hours before consuming the test beverage.

Participants were asked to drink about two cups’ worth of the chilled beverage, which contained zero, 500, 700 or 1,000 milligrams of Salacia oblonga extract. Afterward, the researchers used the finger-prick method to draw blood samples from each person every 15 to 30 minutes for three hours. These blood samples were used to determine insulin and blood glucose concentrations. The biggest changes in blood glucose and insulin levels usually happen within the first two hours after eating.

The beverage that contained the highest concentration of the herbal extract – 1,000 milligrams – provided the most dramatic reduction in insulin and blood glucose levels. Insulin levels were 29 percent lower, while blood glucose levels were 23 percent lower as compared to the control drink, which contained no herbal extract.

As Salacia oblonga can cause intestinal gas, the researchers had the study participants collect breath hydrogen samples hourly for eight hours after drinking the test beverage. The participants collected their breath in small plastic tubes. The researchers then analyzed these breath samples for hydrogen and methane content – the level of either substance in the breath corresponds to the level contained in the colon.

The subjects also rated the frequency and intensity of nausea, abdominal cramping and distention and gas for two days after consuming each test meal.

While the test beverages containing Salacia oblonga caused an increase in breath hydrogen excretion, reports of gastrointestinal discomfort were minimal, Hertzler said.

Right now he and his colleagues are trying to figure out what dose of the herb is most effective, and when it should be taken relative to a meal.

“We want to know how long it takes for the herb to bind to the enzymes that break down carbohydrates,” Hertzler said. “The participants in this study took the herb with their meal, but maybe taking it before eating would be even more effective.”

The researchers also want to study the effects of Salacia oblonga in people with diabetes.

“A lot of studies show that lowering blood sugar levels reduces the risk for all kinds of diabetes-related complications, such as kidney disease and nerve and eye damage,” Hertzler said. “We want to see if this herb has this kind of effect.”

Salacia oblonga is still relatively difficult to find in the United States, Hertzler said, although there are manufacturers that sell the herb through the Internet.

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Article adapted by MD Only Weblog from original press release.
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Contact: Steve Hertzler
Ohio State University

This study was supported by the Ross Products Division of Abbott Laboratories in Columbus.

Hertzler is continuing to conduct Salacia oblonga studies with the Ross Products Division of Abbott Laboratories. He has no links to the company beyond this affiliation.

Hertzler conducted the work with former Ohio State colleague Patricia Heacock, who is now at Rutgers, the State University of New Jersey; Jennifer Williams, a clinical scientist with Ross Products Division, Abbott Laboratories; and Bryan Wolf, a former research scientists with Ross Products Division.