Want the Best Popcorn for Movie Night? Do This 5-Second Test First

Before you toss your next bag of popcorn kernels into the microwave, take five seconds to give it a shake...seriously. It might sound like a silly experiment, but this simple trick could hint at what’s inside the bag and how heavily it’s seasoned. As a dietitian, I know the ingredient list is the best place to start, but I was curious whether a quick shake could reveal anything, too. We put it to the test on a recent Quality Tested episode comparing different popcorn varieties, and one bag was so quiet it completely shocked us.

• First up was 365 by Whole Foods Market No Oil or Salt Added. When we shook the bag, we heard plenty of movement as the kernels rattled around freely, which makes sense because any added fat or salt doesn’t weigh them down.
• Next, we tried Smash Kitchen Organic Sea Salt Popcorn. This bag had less movement than the 365 by Whole Foods variety, but we could still hear the kernels shifting around. That seemed to track since this option contains a little palm oil and salt.
• Then came AMC Theatres Classic Butter Microwave Popcorn. When we shook this bag, we couldn’t hear any movement. The contrast was striking; it was almost as if the seasoning had glued the kernels together.

Microwave popcorn contains more than just kernels. Depending on the variety, it may also contain oil, salt, flavorings, and other ingredients that affect how the kernels move inside the bag.

To get a closer look, we even cut open the bags and examined the contents before popping them (don’t worry, we didn’t microwave the cut bags!). The “experiment” gave us an interesting look at how different popcorn varieties compare, but it also has limits.

A bag that barely rattles doesn’t necessarily contain more fat, calories, or even sodium. The amount of popcorn, how tightly it's packed, and how the seasoning is distributed can all affect how it moves. It was a fun observation, but not a fully reliable way to measure the popcorn’s nutritional value.

As a registered dietitian, I look beyond the front of the bag when comparing popcorn. I like to compare the same serving across brands (in this case, 1 cup of popped popcorn), so I'm looking at a consistent serving size.

Here are a few things I look for:

• Sodium: Less than 50 milligrams per cup.
• Saturated fat: Ideally, 2 grams or less per 1-cup serving.
• Ingredients: I prefer a short list of three simple ingredients: popcorn kernels, oil, and salt.

These are my personal nutrition benchmarks for this category, but not universal rules. And ultimately, fiber and protein should be fairly consistent across brands if it’s just popcorn kernels and some basic seasoning. Plus, regular popcorn shouldn’t have any added sugar since it is more of a salty snack.

And remember, popcorn can absolutely be part of a balanced diet and is actually an incredibly nutritious snack packed with antioxidants and fiber. You don't necessarily need to choose the plainest variety to make a nutritious choice. The shake test might spark your curiosity, but the Nutrition Facts label and ingredient list will tell you much more about what's actually in your bag.