"It has no lasting effects", probably.

And you need to make sure you're looking for both positive and negative effects.

"It's harmful" is a huge bias for a null hypothesis.

> Then what are you saying?

That you shouldn't assume it is harmful.

I didn't say anything about what parents should be "able to do". I didn't even give an opinion on the candy thing. I just think your justification is a big overreach.

But also a null hypothesis implies you're currently doing the testing, so that's a different scenario too...