Two of the studies that looked at the effect of whole grain consumption on weight, an important diabetes risk factor, found only a slight improvement.
The authors write that scientists consider evidence from prospective studies to be weaker than that from randomized controlled trials. They also say that other factors, such as an overall healthy lifestyle, could also influence the development of type 2 diabetes, and that it is not possible to completely correct for known and possibly unknown factors in this study design.
Priebe said that she was surprised to find that there existed only one randomized trial on this topic.
“As type 2 diabetes mellitus is reaching epidemic proportions and diet is considered as a modifiable risk factor, it is important to have a sound knowledge of which kinds of food can contribute to the prevention of this disease and to identify gaps in this knowledge,” she said.
Dr. Osama Hamdy, medical director of the Clinical Obesity Program at the Joslin Diabetes Center in Boston, agreed that the concept of a whole–grains-rich diet as a possible diabetes preventative was interesting.
He, however, insisted that the kinds of data used within the review were troubling. According to him, studies about diabetes prevention should be randomized controlled trials over long durations.
He said that none of the review studies would enable any kind of cause-and-effect conclusion.
“This is an additional piece of information that tells us diets rich in whole grains will probably do some good in the prevention of type 2 diabetes. It is not a shortcut to tell you exactly what you need. It is just more support of a concept that has been around for a long time,” Hamdy said.
“Whole grain foods are rich in dietary fiber and nutrients and they are recommended to be consumed together with plenty of fruit and vegetables for a healthy diet. The findings of this review are in line with those recommendations,” Priebe said.
Source-ANI
KAR/M