The surface of the road was like brown flour, very fine powder, and it was surprisingly slippery stuff.

表面的道路就像布朗面粉，非常细的粉末，这是令人惊讶的湿滑的东西。

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For example, when whole wheat flour is processed into white flour, or brown rice into white rice, the fiber and bran are removed.

比如，把全麦面粉加工成白面粉或者把糙米加工成精白米，纤维和糠就流失掉了，这样“好的”carbs就变成了“坏的”carbs。

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Sugar-rich foods: such as white sugar, brown sugar, honey, sugar cane, carrots, rice, flour, sweet potatoes, dates, sugar beet and fruit.

富含糖的食物：如白糖、红糖、蜂蜜、甘蔗、萝卜、大米、面粉、红薯、大枣、甜菜及水果等。

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According to the American Diabetes Association , the best way to identify healthy grains is to look at the ingredient list and make sure the first ingredient in starchy foods is whole wheat flour, brown rice, rye flour, barley or oats.

CNN: Which starches are beneficial? Which should I avoid?

Using Victorian machinery means the flour produced has to be wholemeal (to make brown or white, for example, would involve sifting out the bran, a process beyond traditional watermill technology), which goes into such products as the home-baked bara brith, a Welsh fruitcake made with dried fruit soaked in tea.

BBC: The sophisticated flavours of rural Wales