合理膳食的英文：
rational diet

rational是什么意思：
adj. 理性的；明事理的；合理的

We live in an era of rationality.
我们生活在理性的时代。

They were evidently rationalizing.
他们显然是在给自己进行辩解。

She is a rational woman.
她是一个有理性的女人。

The reasoning seems rational.
这论据似乎是合乎情理的。

rationalize production, distribution, etc
使生产、 分配等合理化.

diet是什么意思：
n. 日常饮食，日常食物；规定饮食
v. 节食

The Diet is now sitting.
国会现在在会期中。

Sweet potato was the staple of their diet.
过去甘薯是他们的主食。

follow a strict diet
严格遵照饮食规定

The diet supplement is important for me.
饮食补给品对我很重要。

She is on a diet to lose a stone.
她在节食以减少一英石的体重。