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 22 January 2018

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News

Whole-grain rye and wheat foods and markers of bowel health

High-fiber rye and wheat food consumption improves several markers of bowel health, relative to that of low-fiber food, find researchers in the April issue of the American Journal of Clinical Nutrition.

News image

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Whole-grain cereal foods, including rye, have been identified as providing significant health benefits. These benefits do not occur when refined-cereal foods are ingested.

In this study, researchers from Australia compared foods containing whole-grain rye and wheat flour with low-fiber refined-cereal foods. They looked at the effects of these foods on markers of bowel health and metabolic markers, insulin and glucose.

The research team performed a randomized crossover study.

Rye foods were significantly associated with increased plasma enterolactone.
American Journal of Clinical Nutrition

They assessed 28 overweight men aged 40 to 65 years, who had no history of bowel disease.

The team fed subjects low-fiber cereal grain foods providing 5 g dietary fiber (DF), against a background intake of 14 g DF. Their total intake was 19 g DF per day.

In contrast the high-fiber wheat and rye foods provided 18 g of DF each, giving a total of 32 g DF per day.

In addition, the team collected 48-hour fecal samples, as well as fasting and postprandial blood samples, at the end of each period. These were assayed.

The researchers found that both high-fiber rye and wheat foods increased fecal output by 33 to 36%, and also reduced fecal beta-glucuronidase activity by 29%.

In addition, the high-fiber foods decreased postprandial plasma insulin by 46 to 49% and postprandial plasma glucose by 16 to 19%.

The team found that rye foods were significantly associated with increased plasma enterolactone and fecal butyrate, compared to wheat and low-fiber options.

Dr Graeme McIntosh's team concluded, "High-fiber rye and wheat food consumption improved several markers of bowel and metabolic health relative to that of low-fiber food".

"Fiber from rye appears more effective than that from wheat in overall improvement of biomarkers of bowel health."

Am J Clin Nutr 2003; 77(4): 967-74
31 March 2003

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