长期以来，生物学家一直在争论鸟类的产蛋在生物学上是否具有很高的成本，有的理论认为产蛋对能量或营养的要求很高。
Biologists have long debated about whether egg production in birds is biologically highly costly, some theorizing that egg production is energetically or nutritionally demanding.
一些营养学家仍然坚持这一过时的理论：高脂的点心能够改善情绪。
Some nutrition experts still perpetuate the outdated theory that a high-carb snack will boost mood.
如果营养和疾病关系的理论是正确的，也许明年的低合同价格会削减养蜂人补充食物的开销，最终将导致蜂群崩溃失调症(CCD)的逆袭。
And if the nutrition and disease theory is correct, next year's lower contract prices may see beekeepers cutting back on supplemental feeding, and a resurgence of CCD.
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