You don’t need me to tell you that sugary breakfast cereals aren’t the healthiest choice you can make, but you still may be shocked by a recent report released by our friends over at the Environmental Working Group. (I was even bowled over by some of the numbers.)

If you enjoy sweetened breakfast cereals you might want to look away now—otherwise hold on tight to your bowl and spoon. According to the EWG, 12 common breakfast cereals don’t just pack in a lot of sugar… they’re more than 50 percent sugar!

Have a little cereal with your sugar

Kellogg's Honey Smacks and Post Golden Crisp are two brands that found themselves in the EWG's Cereal Hall of Shame. One cereal, Lieber’s Cocoa Frosted Flakes, weighed in at a jaw-dropping 88 percent sugar!

And while those are the most extreme examples the EWG reported on, the rest of the so-called kid’s breakfast cereals (come-on, we all know adults who scarf this stuff up by the boxful) in the analysis of over 1,500 brands didn’t fare a whole lot better. In fact, on average the children’s breakfast cereals were 34 percent sugar.

Your child or grandchild could scarf down a whole bowl of ice cream, or a 6 pack of little powdered donuts, and still not be hitting such a high percentage of sugar. And if you’re the sugared cereal fan in your house, you should know that if you eat just one bowl of the sweet stuff a day you’ll be swallowing down around 10 pounds of sugar a year!