Here’s a more detailed version of your line:
I honestly had no clue about this before. It’s surprising how many things we assume are normal or harmless, but actually have a deeper explanation behind them. Learning about this really changed how I look at it, and it made me realize there’s always more going on than what we first think.
If you want a few variations depending on tone:
More casual:
I had no clue about this before—pretty interesting how something like this can go unnoticed until someone explains it properly.
More dramatic/social media style:
I had no clue about this at all… and now it makes so much more sense. Crazy how much we don’t know about things happening in our own body.
More reflective:
I had no clue about this, and it made me realize how often we misunderstand simple things until we actually learn the science behind them.
If you tell me where you want to use it (caption, comment, script), I can tailor it even better.