在人类文明的开始时期，人通过日常得到的食物营养品可以自己积累脂肪；
The dawning of civilization has enabled modern man to accumulate fat- through regularly available nourishment - at will;
重要的是，要把食物当作营养品，而不仅仅是要吞咽的东西。
It is important to think about food as nourishment rather than just something to swallow.
但omega - 3只是益脑食物的冰山一角；已经证实许多营养物质有促进认知的功效，不仅是在儿童时期吃这类营养品有效，而是终身可食用受益。
But omega-3 is just the tip of the nutritional iceberg; many nutrients have proven cognitive effects, and do so throughout a person's life, not merely when he is a child.
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