Walnuts are wonderfully nutritious — but contain a bit of saturated fat, and quite a lot of calories.

核桃营养非常丰富，但是含有少量饱和脂肪和相当不低的卡路里。

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Servoss said she can see where a little bit of extra fat could be good for people facing a serious illness, but said the more weight you have, the harder it is on your joints.

CNN: Thin is in, but fat might be better