Both words are grammatical over-achievers, acting as verbs and nouns. That complicates things. But really, they boil down pretty well. Here’s the lowdown on their meanings:

Affect (noun) = something to avoid in layman’s terms. If you’re a psychologist who understands the following description, by all means, go to town using affect in the noun form (this is directly from Merriam-Webster): the conscious subjective aspect of an emotion considered apart from bodily changes. Also: a set of observable manifestations of a subjectively experienced emotion: The patient showed incredibly unusual affects.

Affect (verb) = to influence: The tasty pasta meal she just ate will positively affect her performance in the half-marathon tomorrow.

Effect (noun) = the result: The effect was spectacular. Also: an impression. He screamed just for effect. Also: a symptom: The effects of the sleeping pills hadn’t worn off by lunch. Also: having legal validity: The seat belt law is still in effect.

Effect (verb) = to cause: He will effect several changes throughout the company.

If you don’t want to memorize definitions, here’s an easy way to remember:

Affect is the action word (the verb). You’re doing something, affecting something. I am cooking chili, affecting the outcome by stirring in cilantro.

Effect is the result of what happens after the thing that you did. The effect of serving the chili for dinner was that my kids had full tummies and slept like babies that night — and that’s a terrific effect!

I hope that the effect of this blog entry is to affect your grammar usage in a most positive way.

Happy trails!

SAK