Carbs in Popcorn: Is It Good for Diabetics?

Carbs in popcorn

Portion	Carbs	Fiber	Net carbs	Calories
3 cups, popped24 g	19 g	3 g	15 g	93
1 cup, popped8 g	6 g	1 g	5 g	31
1 oz (about 3½ cups)28 g	22 g	4 g	18 g	108
5 cups, popped40 g	31 g	6 g	25 g	155

Per 100 g: 77.8 g carbs, 14.5 g fiber, 12.9 g protein, 4.5 g fat, 387 calories. Source: USDA FoodData Central (Snacks, popcorn, air-popped). Net carbs = carbs minus fiber. Brands and recipes vary, so check the label when you have one.

The short version

Three cups of air-popped popcorn (24 g) have about 19 g of carbs, with about 3.5 g of fiber. One cup has about 6 g.
Yes, people with diabetes can eat popcorn. It's a whole grain, and plain popcorn gives you a big bowl for a moderate amount of carbs.
The type matters more than the popcorn itself. Caramel and kettle corn add a lot of sugar, and microwave and movie popcorn add a lot of fat.
Measure a bowl before you start eating. Popcorn is easy to keep eating straight from the bag.

How many carbs are in popcorn?

Popped corn is mostly air, so it weighs very little per cup. USDA data for plain air-popped popcorn gives 77.8 g of carbs per 100 g, but a cup weighs only 8 g. That works out to:

1 cup (8 g): about 6 g of carbs
3 cups (24 g): about 19 g of carbs
1 oz (28 g, about 3½ cups): about 22 g of carbs
5 cups (40 g): about 31 g of carbs

Popcorn is also high in fiber for a snack. Three cups have about 3.5 g, so if your care team has you count net carbs, that portion comes to about 15 g. It has about 93 calories and very little fat when it's air-popped with nothing on it. New to counting? Our carb counting guide explains labels, portions and fiber.

Popcorn made other ways has similar or slightly fewer carbs per cup, because the corn is the same and the oil adds weight without carbs. What changes is the fat and sugar on top:

Popped in oil at home: 3 cups (33 g) have about 19 g of carbs and 9 g of fat.
Microwave, regular flavor: 3 cups (33 g) have about 15 g of carbs and 14 g of fat.
Caramel-coated with peanuts: 1 oz (28 g, about two thirds of a cup) has about 23 g of carbs, and about 13 g of that is sugar.

An ounce of plain popcorn is a big bowl. An ounce of caramel corn is a small handful with the same carbs, most of them from sugar.

Is popcorn good for diabetics?

Plain popcorn is one of the better snack choices. It's a whole grain, it has fiber, and you get more volume for your carbs than with chips, crackers or pretzels. A bowl you can eat slowly also feels like more food than a few crackers.

It is still a carb food, though, so the portion decides how much it raises you. The American Diabetes Association doesn't ban any one food. It points to the total carbs you eat and how processed they are, and plain popcorn does well on both if you keep the portion in check.

Most of the trouble comes from butter-flavored toppings, sugar coatings, lots of salt, and the size of movie theater tubs.

What popcorn does to blood sugar

Popcorn tends to raise blood sugar at a moderate pace. The fiber slows things down a little, but the starch in it is still absorbed fairly quickly, so you may see a rise within an hour or so.

Fat changes the timing. Buttery microwave or movie popcorn is likely to raise blood sugar more slowly at first, then keep it up for longer. That delayed rise can catch you out hours after the movie ends. Caramel corn adds sugar on top of the starch, so it tends to rise faster and higher.

To see how popcorn affects you, check before you start and about 2 hours later. Our guide to blood sugar 2 hours after eating explains what that reading means and the usual targets.

How to eat popcorn with diabetes

Pour a portion into a bowl. Three cups is a sensible snack for many people. Don't eat from the bag or the tub.
Pop it yourself when you can. An air popper, or a pot with a little oil, lets you control the fat and salt.
Choose plain or light microwave bags over "movie theater butter" types, and read the carbs per popped cup on the label.
Season with savory things. Cinnamon, chili powder, garlic powder, nutritional yeast or a little parmesan add flavor with almost no carbs.
Treat caramel and kettle corn as dessert. Count them like candy, not like a whole grain snack.
Add protein if it's a bigger snack. A handful of nuts, cheese or a glass of milk alongside can make the rise gentler than popcorn alone.

If you want other ideas for lower-carb meals and snacks, see our low-carb meals guide.

If you take insulin Count popcorn like any other carb food, and remember that buttery popcorn may rise later than you expect. How you match insulin to it, and the timing, should come from your doctor or diabetes educator.

Counting it without a scale

Cups of popcorn are hard to judge by eye. In T1dApp you can take a photo of your bowl and get a carb estimate shown as a range you can edit. Two hours later the app asks for your reading, so you can see how your usual popcorn, and your usual portion, affects you.

Snap your meal, see the carbs

T1dApp gives you carbs, calories, protein and fat from a photo, and your likely blood sugar 2 hours later.

Get T1dApp

Sources

This article is general information, not medical advice. Your targets, doses and diet should be set with your doctor or diabetes care team.

Carbs in popcorn, and is it good for diabetics?