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1 Insulin sensitivity is increased, so your cells are better able to use any available insulin to take up glucose during and after activity. 2  When your muscles contract during activity, it stimulates another mechanism that is completely separate of insulin.
However, eating a diet rich in whole grains (which also tend to be higher in fibre) helps improve insulin sensitivity. This, in turn helps the body more efficiently use blood glucose, controls blood glucose levels and reduces fat deposition. The NHS recommends that you try to choose whole grains as often as possible.