Hang on to your cereal bowls, folks, because this story is about to challenge your childhood memories.

Kellogg's Froot Loops are all the same flavour.

The Straight Dope asserted this way back in 1999, but it took a recent post on the Today I Learned subreddit to make people suddenly pay attention.

"According to Kellogg's, all of those delectable loops are flavoured the same," The Straight Dope article revealed.

"Funny how memory works. I distinctly remember my favourite loops to be the purple ones, because they tasted like grape. Who knows what other parts of my childhood I'm misremembering," wrote one Reddit user.

"My mom worked at Kellogg before they were outsourced and told me this years ago. NONE of my friends believed me," another commented.

"More like Toucan SCAM," wrote another.

This week, the cereal experts at Foodbeast did their own taste-tasting experiment in an attempt to disprove this, "only to find that each loop does in fact taste like mildly sweetened cardboard, with negligible or no differences between them."

They followed up the Froot Loops test with Trix and Fruity Pebbles, both of which had similar results.

So while that box of Froot Loops in your cupboard is "packed with delicious fruity taste," that taste is the same, regardless of your favourite loop shade.

Fun fact: when the cereal was introduced in 1962, the only loops available were red, orange and yellow. The rest of the rainbow — green, purple and blue — didn't colour our breakfasts until the '90s.

Also, Cap'n Crunch isn't really a captain.

What was your favourite childhood cereal?