Navigation Links
Good carb, bad carb? Experts debate.

Macaroni faster than spaghetti? A greenish banana faster than a freckled one? Yes, say some of the top-tier nutritional experts.They are convinced that carbohydrates should be labeled good or bad, just the way fats are.//

The debate involves an idea called the glycemic index. It is a way of rating how quickly carbohydrates are digested and rush into the bloodstream as sugar. Fast, in this case, is bad. In theory, a blast of sugar makes insulin levels go up, and this, strangely, leaves people quickly feeling hungry again.

Despite its detractors, the idea seems to be gaining momentum, in part because it is offered as scientific underpinning by the authors of a variety of popular diet schemes, mostly of the low-carb variety.

To believers, the glycemic index is a kind of nutritional Rosetta stone that explains much of what has gone wrong with the world's health and girth over the past two decades: Why diets so often fail. Why diabetes is becoming epidemic. Why mankind is growing so fat.

We overeat because we are hungry, the theory goes, and we are hungry because of what we have been told to eat, which is too much fast-burning food that plays havoc with metabolism by quickly raising blood sugar levels. All of that starch at the base of the food pyramid has had the unintended effect of making us ravenous.

"It's almost unethical to tell people to eat a low-fat, high-carbohydrate diet with no regard to glycemic index," says Janette Brand-Miller of the University of Sydney, one of the field's pioneers.

Controversy weighs on subject
The idea has already entered the scientific mainstream in much of the world and is endorsed by the World Health Organization, but it remains deeply controversial in the United States. It is dismissed by some of the country's weightiest private health societies, including the American Heart Association and the American Diabetes Association.

The fact that carbohydrates bre ak down at different rates has been suspected for a long time. It is why diabetics were once (but no longer) told to studiously avoid sweets, since presumably sugary foods would quickly turn into sugar in the blood stream. About 20 years ago, scientists came up with the glycemic index, or GI, as a way to compare this.

The body converts all carbohydrates -- from starches to table sugar -- into sugar molecules that are burned or stored. The faster carbs are broken down by the digestive system, the quicker blood sugar goes up and the higher their GI.

The GI of at least 1,000 different foods has been measured, in the process knocking down many common-sense dietary beliefs. For instance, some complex carbohydrates are digested faster than the long demonized simple carbs. Foods such as white bread and some breakfast cereals break down in a flash, while some sweet things, like apples and pears, take their time.

In general, starchy foods like refined grain products and potatoes have a high GI -- 50 percent higher than table sugar. Unprocessed grains, peas and beans have a moderate GI. Nonstarchy vegetables and most fruits are low. For instance, overcooking can raise the GI. Ripe fruit is lower than green. A diced potato is lower than mashed, and thick linguini is lower than thin.

To make matters even more confusing, the glycemic index measures only the carbohydrate in food. Some vegetables, such as carrots, have quite high GIs, but they don't contain much carb, so they have little effect on blood sugar.

Therefore, some experts prefer to speak of food's glycemic load, which is its glycemic index multiplied by the amount of carb in a serving. Considered this way, a serving of carrots has a modest glycemic load of 3, compared with 26 for an unadorned baked potato. Metabolic havoc

Blood sugar levels may shoot twice as high after a high-GI meal as after a low one, and that unleashes metabolic havoc: The body responds with a surge of insulin, which prompts it to quickly store the sugar in muscle and fat cells. The high sugar also inhibits another hormone, glucagon, which ordinarily tells the body to burn its stored fuel.

Blood sugar plunges. So much is stored so fast that within two or three hours, levels may be lower than they were before the meal. Suddenly, the body needs more fuel. But because glucagon is still in short supply, the body does not tap into its fat supply for energy. The inevitable result? Hunger.

That, at least, is the theory. Experiments to prove this are difficult and time-consuming. Among those trying is Dr. David Ludwig of Boston's Children's Hospital, who has done several studies on overweight teenagers.

Ludwig says overweight people do not need to starve themselves. On a low-GI diet, they can eat enough to feel satisfied and still lose weight. In a pilot study, he tested this on 14 overweight adolescents. They were put on two different regimens -- a standard low-cal, low-fat, high-carb diet and a low-GI plan that let them eat all they wanted. After one year, the low-GI volunteers had dropped seven pounds of pure fat. The others had put on four. Now he is repeating the study on 100 heavy teenagers.

Even such small experiments have been rare. Most support for the idea comes from big surveys that follow people's health and diets over time. Some of these show that those who consistently favor low-GI fare are less likely to become overweight or to get diabetes and heart disease.
'"/>




Related medicine news :

1. Spread Of Rocky Mountain Spotted Fever Is A Probability, Say Experts
2. Experts Recommend Preventive Measures For Avian Flu To Begin From Farms
3. Experts Insist That Neonatal Herpes Be Reported Regularly
4. Experts State Strategies To Increase Good Cholesterol
5. Cancer Can Recur Any Time, Experts Caution
6. Experts Building Bird Flu Warning System
7. Human Growth Hormone (HGH) - View of Experts
8. Experts urging artery screening in the UK
9. Genetic Experts of Hopkins Assists In Identifying Hurricane Katrina Victims
10. Birds Being Shot Owing To Bird Flu Fear: Wildlife Experts
11. Slow Down Budhia, Warn Medical Experts
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/20/2017)... ... June 20, 2017 , ... AMC Health , the leading provider of ... clinical trials market. Similar to its approach in demonstrating positive outcomes in the healthcare ... by proving the value of eVisits to support virtual studies. , In ...
(Date:6/20/2017)... (PRWEB) , ... June 20, 2017 , ... With certifications ... Invisalign® in Denville, NJ, Drs. Adam and Hal Kimowitz are currently accepting new ... complications that traditional orthodontics can cause for some patients, which is why they offer ...
(Date:6/20/2017)... , ... June 20, 2017 , ... Uniform Advantage ... collection featuring seven new products designed to create tailored looks and athleisure-inspired outfits. UA ... and cotton easy care stretch twill. , With trendy looks hitting the medical community, ...
(Date:6/20/2017)... Smithsburg, Maryland (PRWEB) , ... June 20, 2017 ... ... communication to the patient’s bedside, would like to officially welcome Anthony Stanowski, DHA, ... side-by-side with Dr. Stanowski whose insight and expertise in healthcare will provide invaluable ...
(Date:6/19/2017)... ... 2017 , ... The joyful summer wedding season is upon us, but it’s ... winter and wet spring have created ideal conditions for mosquitoes and ticks poised to ... pesky mosquitoes when a bride and groom are saying their "I do's,” observes Manuel ...
Breaking Medicine News(10 mins):
(Date:6/2/2017)... LAWRENCE, Mass. , June 2, 2017  NxStage ... advancing renal care, today announced new findings demonstrating positive ... NxStage ® System One™. The data will be ... 2017, in Madrid, Spain . ... Knowledge to Improve Home Dialysis Network in ...
(Date:5/29/2017)...  Cellect Biotechnology Ltd. (NASDAQ: APOP ; TASE: ... functional selection of stem cells, today provided a corporate ... ended March 31 st , 2017. ... first quarter of 2017," said Dr. Shai Yarkoni, Chief ... treatment of the first blood cancer patient in the ...
(Date:5/22/2017)... , May 22, 2017  Lilac Corp, the ... announces the launch of a new website ... results of a clinical study that showed surprising ... with Gene-Eden-VIR/Novirin in individuals suffering from HPV warts, ... that there are no other treatments that clear ...
Breaking Medicine Technology: