The Difference Between Sweet Potatoes and Yams


Have you ever been to the grocery store in search of sweet potatoes and seen a close second right next to them, similar in appearance, but labeled as a yam? You're not the only one. However, contrary to popular belief, the two might seem identical, but they're surely not a twin powerhouse root vegetable duo.

This is everything you need to know about the difference between sweet potatoes and yams. But first, a history lesson. We're all confused by sweet potatoes and yams because there are two varieties of sweet potatoes (more on that later) and to prevent confusion, the United States Department of Agriculture (the USDA) decided to name the orange-inside sweet potatoes as yams and the cream-inside sweet potatoes as sweet potatoes.

What are Yams?

From Africa, true yams are tubers (tuberous roots), meaning they form from thickened rhizomes or stolons, and are staples in traditional diets. Unlike that of the sweet potato, the skin of the yam is rough, hiding a white, starchy interior. Something to note about yams is their ability to grow to massive proportions; we're talking over 100 pounds, and that could be just one yam!

What are Sweet Potatoes?

You may be curious how something as small as sweet potato, deriving from the Americas, could get confused with something out of a different continent, made up of an entirely different genetic code, and even with a different taste. Let's be thankful regular potatoes didn't get confused in this mess as well!


In the 18th century, the sweet potato picked up the name yam when West Africans were placed into slavery. Being that their native yam seized to exist at the time, the African slaves took to a different and more colorful tuber (the sweet potato) and began referring to it as a yam. While it wasn't exactly the tuber they were used to, these soft sweet potatoes seemed to do the job.

View this post on Instagram

Sweet Potato Hash with Bacon! . INGREDIENTS: * 8 ounces bacon * 1 onion, diced * 1 red bell pepper, diced * Salt and freshly ground black pepper * 2 pounds sweet potatoes, peeled and chopped into 1-inch cubes * 1 teaspoon chopped fresh thyme * 1 loaf crusty bread, sliced * 3 tablespoons butter, softened * 8 eggs DIRECTIONS: 1. In a large skillet, fry bacon until crisp. Using a slotted spoon, transfer bacon to a napkin-lined plate. Poor off 3 tablespoons bacon fat and reserve for frying the eggs; leave remaining bacon fat in the skillet. 2. Add onion, red pepper, ¼ teaspoon salt, and 1/8 teaspoon pepper. Cook until softened, stirring occasionally, about 5 minutes. 3. Stir in sweet potatoes, ½ teaspoon salt, and ¼ teaspoon pepper. Cover and cook, stirring occasionally, until softened and the sweet potatoes begin to brown, about 10 to 15 minutes. 4. Finely chop fried bacon. Stir chopped bacon and thyme in to skillet. Taste for seasonings and add additional salt and pepper if desired. Turn heat to low and cover to keep warm. 5. Heat a medium nonstick skillet over medium-high heat. Spread each slice of bread with 1 teaspoon butter on one side and place butter-side down in the skillet to grill. Heat until lightly golden brown. Remove from heat and cover to keep warm while preparing the eggs. 6. Heat reserved bacon fat in a nonstick skillet and fry eggs to desired doneness. This may be done with all eggs at once or in batches. Season the eggs to taste with salt and pepper. 7. To assemble, place grilled bread on a plate. Spoon about ½ cup Sweet Potato and Bacon Hash on top of the bread, then top with a fried egg. Serve immediately.

A post shared by Recipes ? Meggan Hill (@culinaryhill) on

However, the name didn't really grow traction until the 19030s when crop growers in Louisiana used the term yam to differentiate their crop's orange color from their competitors, which was more yellow-toned.

In today's day and age, selling a sweet potato as a yam is actually illegal. Both distributors and farmers alike could be in the hole if they tried this trick today. The words 'sweet potatoes' has to be somewhere physical on the product or the label for them to be classified as a 'yam' for sales purposes.

Can you handle another jaw-dropper? Sweet potatoes aren't actually even potatoes. They belong to the Morning Glory family - you know, the flowers. However, there are two sweet potato varieties - one with a creamy white inside and one with an orange inside to make this debate even harder.


How can you tell the difference?

  • If the skin of the object you're holding is dark - close to brown, similar to bark in texture, and has a white flesh, you're holding a yam.
  • If the skin of the object you're holding is dark, similar to bark, and has a purple or reddish inside, you're holding a yam.
  • If the skin isn't super dark with an orange flesh, you're definitely holding a sweet potato.
  • If the skin is dark with a soft, cream-colored flesh, you're holding a sweet potato.

Bruce's Yams Cut Sweet Potatoes in Syrup 15 oz - image 1 of 1

So those canned yams you top with marshmallows and brown sugar are actually sweet potatoes. Instead of yam casserole, call it sweet potato casserole.

Watch: We Ranked the 10 Best Blue Bell Flavors