This is because lighter colors take in less of the strong heat of the sun than dark colors do.
VOA: special.2009.08.19
Doctor Sun says less refined grains have more nutritional value than refined grains.
VOA: special.2010.06.30
In addition to this major benefit, Sun points out that less refined grains tend to have more nutritional benefits than their refined counterparts.
VOA: standard.2010.06.25
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