I want to do always eat not fat version.

我想做永远吃不胖的吃货。

youdao

Because you're not burning calories, everything you eat turns to fat.

因为你没有消耗卡路里，所以你吃的每样东西都会变成脂肪。

《柯林斯英汉双解大词典》

They eat too many fatty and sugary foods, but they are not eating enough to be fat.

他们吃了太多含脂肪和糖的食物，但他们吃的还不够他们变胖。

youdao

That links to the Trans fat thing and you want -for health reasons it's probably good not to eat too many of those.

这和反式脂肪有关,为健康考虑最好少吃那些食物

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