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A Handful of Pistachios Can Decrease Glycemic Response

Posted: Tuesday, December 27, 2011

A couple of handfuls of pistachio nuts eaten with a high-glycemic meal such as pasta can do wonders for postprandial glucose and insulin levels, especially in people with metabolic syndrome.
The study, sponsored by the Western Pistachio Association, Fresno, California, included 20 patients with metabolic syndrome (12 women; average age, 54 years) and an average body mass index of 37.5 kg/m2, reported lead investigator Cyril W.C. Kendall, PhD, from the University of Toronto, Ontario, Canada.

In an expansion of research recently published Dr. Kendall described how pistachios (84 g) were served to fasting patients, either alone or in combination with white bread (50 g) or white bread with butter and cheese.

Venous and finger-prick blood sampling was used to assess glucose and insulin responses over 3 hours, as well as glucose-dependent insulinotropic peptide (GIP) and glucagon-like peptide-1 (GLP-1) and ghrelin.

The study found that when carbohydrates were consumed with pistachios there was a blunted postprandial glycemic response, suggesting a beneficial effect for patients with the metabolic syndrome.

A previous paper published by the group showed the glycemic response to meals of rice and pasta was similarly blunted by pistachio nuts, and the response approached statistical significance with instant mashed potatoes.

"These data demonstrate that the addition of pistachios to foods with high available carbohydrate content reduces the overall glycemic impact of the foods studied [parboiled rice, pasta, white bread, and mashed potatoes], despite increasing the overall available carbohydrate content," the authors wrote.

"We're looking at mechanisms," Dr. Kendall responded in an interview. "Nuts have healthy protein and healthy fats and they're low in available carbohydrate, so hopefully they're replacing available carbohydrate, which tends to have a high glycemic index in North America. The effects are quite modest, but these are some of the mechanisms by which nuts — and pistachios in particular — help to improve glycemic control."

Source: http://www.diabetesincontrol.com/index.php?option=com_content&view=article&id=11932&catid=53&Itemid=8, International Diabetes Federation (IDF) World Diabetes Congress 2011. Abstract # O-0479. Presented December 6, 2011.

 
 
 
 
 
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