The analysis was funded by grants from the Kellogg Company as well as other food and nutrition companies.
Because none of the studies randomly assigned people to eat different amounts of whole grains, including cereal fiber, they can't prove it was the fiber, itself, that prevented diabetes and heart disease.
But a large enough long-term study to prove cause and effect would be difficult, the study team wrote.
"It may simply be, people (who eat cereal fiber) are full longer, and therefore they don't eat so much, and they're leaner," Fung, who wasn't involved in the new study, told Reuters Health.
"Another possibility is people who eat a lot of cereal fiber, they don't just eat a lot of cereal fiber. They're also more healthy" in other ways, she said.
SOURCE:
http://bit.ly/14MVLs2 American Journal of Clinical Nutrition, online June 26, 2013.
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