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Your favorite childhood cereals, ranked by sugar

FILE - BERKELEY, CA - SEPTEMBER 23:  Boxes of cereal made by General Mills sit on the shelf at a grocery store September 23, 2009 in Berkeley, California. General Mills Inc. reported a 51 percent jump in first quarter profits with earnings of $420.6 million, or $1.25 per share compared to $278.5 million, or 79 cents per share one year ago.  (Photo by Justin Sullivan/Getty Images)
FILE - BERKELEY, CA - SEPTEMBER 23: Boxes of cereal made by General Mills sit on the shelf at a grocery store September 23, 2009 in Berkeley, California. General Mills Inc. reported a 51 percent jump in first quarter profits with earnings of $420.6 million, or $1.25 per share compared to $278.5 million, or 79 cents per share one year ago. (Photo by Justin Sullivan/Getty Images) (2009 Getty Images)

(CNN) – Even in today’s health-conscious world, sugar-soaked cereal remains a morning staple for many US kids, who are blissfully unaware of how much sugar lurks in every spoonful.

But on this National Cereal Day, we're poking through the nostalgia to rank beloved cereals from least to most sugary.

To evaluate the amount of sugar, we followed criteria outlined by the Child and Adult Care Food Program (CACFP), a service of the US Department of Agriculture that reimburses care facilities that give out snacks.

According to the CACFP, facilities cannot serve breakfast cereals that contain more than 21.2 grams of sugar per 100 grams of dry cereal. That value is calculated by dividing the cereal's grams of sugar per serving by the serving size in grams.

If the answer is 0.21 or less, the cereal is below the sugar limit. Anything higher is considered unhealthy.

Each cereal was evaluated dry, by its original flavor, based on the nutritional information available on each cereal brand's website. We're sorry in advance for the crushing disappointment.

13. Cheerios

Serving size: 28 grams

Sugars: 1 gram

0.04 grams of sugar per dry ounce

The tried-and-true original flavor still sits among the least-sugary cereals on the market.

12. Rice Krispies

Serving size: 40 grams

Sugars: 4 grams

0.1 grams of sugar per dry ounce

Snap, crackle, pop -- low sugar!

11. Cinnamon Toast Crunch

Serving size: 31 grams

Sugars: 9 grams

0.29 grams of sugar per dry ounce

This wouldn't fly by CACFP standards.

8. [tie] Froot Loops

Serving size: 39 grams

Sugars: 12 grams

0.31 grams per dry ounce

Toucan Sam can rest easy knowing he's not the mascot for the sugariest cereal around. His loops are still pretty sugary though.

8. [tie] Reese’s Puffs

Serving size: 29 grams

Sugars: 9 grams

0.31 grams of sugar per dry ounce

You could do worse -- like eating the candy that inspired the cereal on its own.

8. [tie] Trix

Serving size: 39 grams

Sugars: 12 grams

0.31 grams of sugar per dry ounce

Trix are for kids who like sugar.

4. [tie] Apple Jacks

Serving size: 39 grams

Sugars: 13 grams

0.33 grams of sugar per dry ounce

You're better off eating an apple. Just sprinkle some cinnamon on top.

4. [tie] Cocoa Puffs

Serving size: 27 grams

Sugars: 9 grams

0.33 grams of sugar per dry ounce

Feeling cuckoo for Cocoa Puffs? That might be all the sugar.

4. [tie] Cookie Crisp

Serving size: 36 grams

Sugars: 12 grams

0.33 rams of sugar per dry ounce

This is a cereal made with teeny cookies. What did you expect?

4. [tie] Fruity Pebbles

Serving size: 27 grams

Sugars: 9 grams

0.33 grams of sugar per dry ounce

Don't blame the Flinstones. They didn't have Nutrition Facts labels in the Stone Age.

3. Frosted Flakes

Serving size: 39 grams

Sugars: 14 grams

0.36 grams of sugar per 100 dry ounces

They're grrrrEAT! And covered in sugar. Sorry, Tony.

2. Lucky Charms

Serving size: 27 grams

Sugars: 10 grams

0.37 grams of sugar per 100 dry ounces

That gold at the end of the marshmallow rainbow is the crown your dentist inserts to cover a cavity.

1. Cap’n Crunch

Serving size: 38 grams

Sugars: 17 grams

0.45 grams of sugar per 100 dry ounces

Aye yai yai, Captain.