Researchers at the University of California, Davis Peter J. Havel, Ph.D., Kimber Stanhope and colleagues designed a clever study to find out. First, they brought 23 adults are overweight (overweight) and obesity (obese), aged 43 years to 70 years, to the center of their clinics.
For two weeks, the volunteers' diets were strictly controlled. They got a high-carbohydrate diet (55%), moderate fat (30%) had balanced so that no excess energy to those issued for other than sport.
After measurement of risk factors for heart disease to them, such as blood lipids, cholesterol, and weight, the researchers gave them freedom. Then, for 8 weeks, the volunteers were allowed to eat whatever they wanted except for one thing. Everyone should drink three sweetened beverages every day, which provide 25% of the recommended daily energy intake.
Half the subjects drank with pure glucose. The other half got beverages sweetened with pure fructose. The researchers continue to test their heart disease risk factors. After 8 weeks, the volunteers were asked to return to the clinical center, where they continued to drink soft drinks but had to return to the energy-balanced diet. Two weeks after they start drinking soft drinks, sugar dark side becomes more apparent. Those who drank beverages sweetened with fructose showed signs of an increased risk of heart disease. Who drank glucose-sweetened soft drinks is not the case. Fructose drinkers LDL (bad cholesterol), blood lipids, and signs of worsening heart disease risk. Their insulin sensitivity decreased, a sign of their increased risk of diabetes.
In addition, fructose drinkers gained additional weight of about 1.5 kg, while the glucose drink did not receive extra weight. The news may be bad. Stanhope says that preliminary data from a new study suggests that regular sugar and high-fructose corn syrup each same effect as fructose alone, even though they only contain half fructose and half glucose (normal syrup usually contains 100% glucose).
It's too early to give an overview of the new study. But Stanhope lamented any person providing health food labels on soft drinks sweetened. "Not a good idea to drink a lot of soft drinks. We give these people as much as 3 sodas a day. Some drink that much, some people in real life more than that, and some only drink 1 a day. Give me two years and we'll know more about the level of safety ". Stanhope reported these findings to the 67th Annual Scientific Sessions of the American Diabetes Association on June 22 to 26, 2007 in Chicago.