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PhotoIn the latest study linking the  sweetener fructose to obesity, researchers used brain magnetic resonance imaging (MRI) and found that sugar, but not fructose, produced feelings of fullness in test subjects, according to preliminary results published in the January 2 issue of JAMA.

The researchers said that sugar -- glucose -- reduced cerebral blood flow and activity in brain regions that regulate appetite while fructose did not and that ingestion of glucose but not fructose produced increased ratings of satiety and fullness.

In November 2012, Researchers at the University of Southern California (USC) and at Oxford produced a study that found countries using high fructose corn syrup in their food supply have a 20 percent higher prevalence of type 2 diabetes, a condition often associated with obesity. A 2009 study linked fructose with high blood pressure, the researchers noted.

Obesity, diabetes

Photo“Increases in fructose consumption have paralleled the increasing prevalence of obesity, and high-fructose diets are thought to promote weight gain and insulin resistance. Fructose ingestion produces smaller increases in circulating satiety hormones compared with glucose ingestion, and central administration of fructose provokes feeding in rodents, whereas centrally administered glucose promotes satiety,” they said. “Thus, fructose possibly increases food-seeking behavior and increases food intake.”

Kathleen A. Page, M.D., of Yale University School of Medicine, New Haven, Conn., and colleagues conducted the latest study, which included 20 healthy adult volunteers who underwent two magnetic resonance imaging sessions after drinking fructose or glucose drinks.

“Glucose but not fructose ingestion reduced the activation of the hypothalamus, insula, and striatum—brain regions that regulate appetite, motivation, and reward processing," they reported.

Supersizing waistlines

PhotoIn an editorial accompanying the study, Jonathan Q. Purnell, M.D., and Damien A. Fair, PA-C, Ph.D., of Oregon Health & Science University, Portland, said the findings supported the notion that fructose promotes increased food intake.

“[T]he implications ... are that the advances in food processing and economic forces leading to increased intake of added sugar and accompanying fructose in U.S. society are indeed extending the supersizing concept to the population's collective waistlines.”


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Critique of David Gillespie's Big Fat Lies
You missed the part of the study where they actually surveyed the people on satiety, fullness and hunger - here is the quote from the study (have removed the numbers to make it easier to read, emphasis mine) - "There was NO significant difference between glucose vs fructose ingestion on predrink-postdrink changes in hunger, fullness or satiety". Considering that HFCS and sucrose actually contain (almost) equal amounts of glucose and fructose - it is a little hard to extrapolate this study, even if there was differences in the actual physical outcomes. Also consider the serving sizes used, 75g of glucose would require drinking 150g of sucrose or slightly less HFCS (we also don't know if there would be any effect in solid vs liquid food). A little early to take anything from a study that really only showed changes in blood flow but NOT in actual measures of hunger, fullness and satiety!
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