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Übergewichtige nehmen unter Diät mit niedriger glykämischer Last besser ab - wenn sie viel Insulin produzieren [Ernährung]
07 Dez 05

Untersuchung vergleicht 3 verschiedene Diäten über 6 Monate

Eine Untersuchung hat 3 verschiedene Diäten über 6 Monate miteinander verglichen:

  • kalorienreduzierte Diät,
  • Diät mit niedriger glykämischer Last,
  • Diät mit hoher glykämischer Last.

Dabei zeigte sich, dass die Teilnehmer in der Diät mit niedriger glykämischer Last den größten Gewichtsverlust zu verzeichnen hatten, sofern die Probanten viel Insulin ausschütteten:

"In our study," says first author Anastassios Pittas, MD, assistant professor at Tufts University School of Medicine, "everyone lost some weight as a result of restricting calories, but people who had high levels of insulin secretion and ate a diet with a low glycemic load lost the most weight."

Abstract:
The latest information coming from the Friedman School of Nutrition Science and Policy at Tufts University
Friedman School of Tufts: Nutrition notes
When weight loss is the goal, most diets restrict calories. It is a relatively simple concept--a person can lose weight by taking in fewer calories than he or she expends. But does it matter where the calories come from? It might, according to findings from a small study published in the December 2005 issue of the medical journal Diabetes Care. Researchers at the Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University discovered that a diet's overall "glycemic load" may be an important determinant of weight loss, but only for some people.
Senior author Susan Roberts, PhD, director of the Energy Metabolism Laboratory at the Center says, "Our results suggest that in the future there may be a way to predict who will do best on a low glycemic load diet." The key, they have found, may be in knowing a person's level of insulin secretion.

"Insulin is a hormone that is important in glucose (sugar) metabolism," explains senior author Andrew Greenberg, MD, director of the Obesity and Metabolism Laboratory at the Center. "The regulation of body weight is, at least in part, influenced by how much insulin a person secretes in response to a load of glucose, as well as by how sensitive that person is to insulin's glucose-lowering effects."

"In our study," says first author Anastassios Pittas, MD, assistant professor at Tufts University School of Medicine, "everyone lost some weight as a result of restricting calories, but people who had high levels of insulin secretion and ate a diet with a low glycemic load lost the most weight."

As part of the ongoing Comprehensive Assessment of Long-term Effects of Reducing Intake of Energy (CALERIE) trial at Tufts, the authors studied 32 healthy overweight adults on a reduced-calorie diet for six months. Half of the subjects were randomly assigned to a low glycemic load diet, and the other half followed a diet with a high glycemic load.

"A food's glycemic load is a relative measure of how much carbohydrate is in the diet and how quickly that food is converted in the body to blood sugar. Foods with lower numbers typically have a greater proportion of protein and fat, which usually result in a smaller rise in blood glucose following a meal. Examples of low glycemic load foods include salads with oil and vinegar dressing, high fat granola cereal, and most fresh fruits and vegetables. Glycemic load may not be the 'be-all, end-all' of weight-loss diets for everyone," says Roberts, who is also a professor at the Friedman School of Nutrition Science and Policy at Tufts, "but it significantly enhanced weight loss in our high-insulin-secreting subjects."

"Our findings may eventually have implications for individualizing weight-loss diets," says Roberts. "We need to confirm our results with further studies of larger groups of subjects first, but measuring insulin secretion might be a simple way to target dietary recommendations that help enhance successful weight loss." Greenberg, who is also an assistant professor at the Friedman School, notes that "only when we have completed these future studies can we determine whether these tests will be useful for making recommendations for the general public."

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