Sweet Potato Nutrition Facts and Benefits

December 18, 2017
Sweet potato nutrition - Dr. Axe

By Rachael Link, MS, RD

Striking the balance between vibrant, versatile and delicious, sweet potatoes have become a pretty common component of the modern diet. From sweet potato fries to casseroles to pies and beyond, there are a myriad of ways to enjoy this tasty tuber. Still, many people have doubts when it comes to the sweet potato nutrition profile.

This is because sweet potatoes are usually associated with regular potatoes, which are often served deep-fried, salted and in massive portions that are loaded with extra fat, sodium and calories. But are sweet potatoes bad for you? And if you’re on a diet, are sweet potatoes fattening or weight loss-friendly? Keep reading to find out what you need to know about sweet potato nutrition and why you should include a serving or two in your diet.


Sweet Potato Nutrition Facts

Sweet potatoes are high in many important nutrients. They contain a good amount of fiber as well as vitamin A, vitamin C, manganese and several other vitamins and minerals.

One medium cooked sweet potato contains approximately: (1)

  • 103 calories
  • 23.6 grams carbohydrates
  • 2.3 grams protein
  • 0.2 gram fat
  • 3.8 grams dietary fiber
  • 21,907 international units vitamin A (438 percent DV)
  • 22.3 miligrams vitamin C (37 percent DV)
  • 0.6 milligram manganese (28 percent DV)
  • 0.3 milligram vitamin B6 (16 percent DV)
  • 541 milligrams potassium (15 percent DV)
  • 1 milligram pantothenic acid (10 percent DV)
  • 0.2 milligram copper (9 percent DV)
  • 1.7 milligrams niacin (8 percent DV)
  • 0.1 milligram thiamine (8 percent DV)
  • 30.8 milligrams magnesium (8 percent DV)

 

Sweet potato nutrition - Dr. Axe

 

In addition to the nutrients above, sweet potato nutrition also contains riboflavin, phosphorus, vitamin E, vitamin K, calcium and iron.


Sweet Potato Nutrition: Sweet Potato Benefits

  1. Stabilizes Blood Sugar
  2. High in Antioxidants
  3. Boosts Brain Function
  4. Enhances Immunity
  5. Promotes Vision Health
  6. Aids in Weight Loss

1. Stabilizes Blood Sugar

Sweet potatoes are an excellent dietary addition for those with diabetes as they have been shown to help reduce and regulate blood sugar levels. In fact, there are several studies focused on learning more about the connection between the sweet potato and diabetes. Caiapo, in particular, is a type of white sweet potato that has been studied extensively for its anti-diabetic properties.

In one study out of the University of Vienna in Austria, 61 participants with diabetes were given either four grams of Caiapo or a placebo daily for three months. At the end of the study, the sweet potato group had significantly lower blood sugar levels than the control group. (2)

Another small study published in the journal Metabolism showed that treating diabetic patients with Caiapo for six weeks helped improve insulin sensitivity. (3) Insulin is the hormone responsible for the transport of sugar from the blood to the tissues where it can be used as energy. Improvements in insulin sensitivity allow it to work more efficiently in the body to maintain normal blood sugar.

Additionally, sweet potatoes are high in fiber, with each medium sweet potato fulfilling up to 15 percent of your fiber needs for the entire day. Fiber slows the absorption of sugar to help prevent spikes and crashes in blood sugar levels.

2. High in Antioxidants

Antioxidants are compounds that help fight off harmful free radicals to reduce the risk of chronic disease and prevent damage to the cells. Antioxidants may protect against diabetes, heart disease and even cancer. (4) Besides being rich in fiber and many important vitamins and minerals, sweet potatoes are also loaded with these beneficial antioxidants.

Orange-fleshed sweet potatoes are especially high in beta-carotene, which is the pigment responsible for their characteristic vibrant orange flesh. Beta-carotene is a powerful antioxidant that can help promote healthy vision, improve respiratory health and even protect your skin. (5, 67)

Sweet potato nutrition - Dr. Axe

Studies show that colored sweet potatoes, in general, exhibit more potent activity against free radicals than white sweet potatoes with purple potatoes, specifically, containing the highest amount of antioxidants. (8)

In addition to sweet potatoes, other top antioxidant foods include goji berries, blueberries, dark chocolate and pecans.

3. Boosts Brain Function

Some research has found that eating sweet potatoes could help boost brain function and improve memory thanks to their abundance of nutrients and antioxidants.

One animal study out of Chungnam National University’s College of Pharmacy in Korea, for instance, treated rats with purple sweet potato extract and found that it prevented oxidative damage in the brain, enhanced cognitive performance and improved memory. (9)

 

Another animal study conducted in China in 2010 showed that purple sweet potato extract helped protect against brain aging and improved spatial learning and memory ability in mice. (10)

Avocados, beets, broccoli and leafy green vegetables are examples of other brain foods that can help boost focus and memory.

4. Enhances Immunity

Sweet potato nutrition is jam-packed with vitamin A, with each medium potato cramming in about 438 percent of the daily vitamin A requirement. This vitamin plays a role in many aspects of health, but it is especially important in terms of immunity.

Vitamin A helps stimulate the production of immune cells that fight off disease and infection. (11) It also can help kill off harmful cells and has been shown to have anti-tumor properties in some animal studies. (12) Many studies have even reported that vitamin A supplementation can help reduce the risk of death from infectious diseases in certain areas where vitamin A deficiency is common. (13)

Getting enough vitamin A from foods like sweet potatoes is crucial to maintaining healthy immune function. Other top vitamin A foods include carrots, kale, spinach and apricots.

5. Promotes Vision Health

In addition to boosting immunity, vitamin A is also integral to maintaining healthy vision. A deficiency of vitamin A can result in symptoms like dry eyes, night blindness, a buildup of keratin on the conjunctiva and even total vision loss in severe cases.

One medium sweet potato can meet and exceed your daily vitamin A needs. In fact, if you can squeeze even just one-fourth of a sweet potato into your diet, you’re set for the entire day.

Not only that, but sweet potatoes also contain important antioxidants that can contribute to vision health as well. Beta-carotene, for example, has been shown to slow the progression of age-related macular degeneration, a condition that can result in vision loss.

Other eye vitamins that you should incorporate into your diet include vitamin C, zinc and omega-3 fatty acids.

6. Aids in Weight Loss

If you have a few stubborn pounds that you’re trying to lose, incorporating this nutritious root vegetable into your diet may be able to help. The sweet potato benefits weight loss because it’s super nutrient-dense and loaded with fiber to help keep you full.

Fiber moves slowly through the digestive tract, helping promote satiety and cut cravings to aid in weight loss. Just one cup of sweet potatoes boasts a whopping 6.6 grams of fiber, or up to 26 percent of what you need for the entire day.

A recent 2017 animal study also found that purple sweet potatoes, in particular, may have extra weight-busting benefits. Mice were fed a high-fat diet and were supplemented with purple sweet potatoes, which were shown to reduce body weight and fat accumulation over a 12-week period. (14)

Of course, sweet potatoes should be paired with a healthy diet and regular exercise to achieve maximum weight loss. Fortunately, not only do sweet potatoes aid in weight loss, but they can also help you achieve your fitness goals as well. Sweet potato benefits bodybuilding because it is slowly digested, providing you with long-lasting energy to fuel you through your gym session.


Sweet Potato vs. Yams

Sweet potatoes are often referred to as yams, and for many, the terms are considered pretty much interchangeable. However, not only are they two entirely different plants, but there are some other major differences between yams vs sweet potatoes.

First of all, the sweet potato belongs to the morning glory family of plants while yams — not to be confused with Mexican yams or wild yam — are actually related to lilies and grasses. Additionally, sweet potatoes are thought to have originated in Central and South America while yams are native to Africa and Asia.

There are also some significant differences in the appearance of the yam vs. sweet potato as well. Sweet potatoes have tapered ends with smoother skin and can range in color from white to vibrant orange and purple. Yams, on the other hand, have rough skin and are typically white-fleshed and cylindrical. Yams are also more starchy and dry without the hint of sweetness found in sweet potatoes.

Gram for gram, yam nutrition is higher in calories, carbohydrates and fiber but slightly lower in protein than sweet potatoes. Yams also contain a good amount of vitamin C, vitamin B6, potassium and manganese but are not as nutrient-dense as sweet potatoes.

 

Sweet potato vs. yam - Dr. Axe

 


Sweet Potato Nutrition vs. White Potato Nutrition

Although both have become common kitchen staples, there are some distinct differences between white potatoes and sweet potatoes. They both belong to different plant families, are notably different in terms of appearance and each has a unique taste that sets it apart. While white potatoes are often incorporated into savory dishes, sweet potatoes have a flavor that works for both desserts and main courses alike.

But are sweet potatoes healthier than regular potatoes?

Looking at the sweet potato vs. potato in terms of nutrition, each brings a different set of nutrients to the table. White potato nutrition, for example, is especially high in certain micronutrients like vitamin C, folate, vitamin B6, potassium and manganese, while sweet potatoes are significantly higher in vitamin A.

Per 100 grams, there are 20.7 grams of carbs in sweet potato compared with 21.5 grams of carbs in regular potatoes. Meanwhile, the amount of sweet potato calories is slightly lower as well, with 94 calories in a potato compared to just 90 calories in sweet potato. Sweet potatoes are also slightly higher in fiber and have a lower glycemic index, meaning they don’t cause the same sharp increase in blood sugar as regular potatoes.

However, both can be healthy additions to the diet when used in moderation and with proper portion control. Preparation method is also key; potatoes are often deep-fried and doused in oil and salt, which depletes their nutritional value. Try them baked instead of fried and enjoy a few servings of both sweet potatoes and regular potatoes as part of a nutritious diet.


Where to Find and How to Use Sweet Potatoes

Sweet potatoes are widely available at most grocery stores and typically found in the produce section, usually right alongside white potatoes. Special varieties, such as white or purple sweet potatoes, may be more difficult to find, however. Look for them at farmers markets or Asian specialty stores from September through April to take advantage of the purple and white sweet potato nutrition benefits.

Once you get your hands on some sweet potatoes, there are plenty of ways to enjoy these delicious root vegetables. From simply enjoying a microwave sweet potato with minimal effort required to baking, roasting, sautéing or boiling your sweet potatoes, the possibilities are limitless. Sweet potato fries, soups and casseroles are some of the most popular ways to prepare sweet potatoes, but there are many other options available as well.


Sweet Potato Recipes

Looking for some unique new ways to incorporate this tasty tuber into your diet? Give these delicious sweet potato recipes a try:


Sweet Potato Nutrition History

Sweet potatoes have been domesticated for thousands of years, and sweet potato remnants have been discovered in Peru dating all the way back to 8,000 B.C. It’s believed that sweet potatoes were brought to Polynesia from South America around the year 700 A.D. From there, they spread across the globe from Hawaii to New Zealand to the Philippines and beyond.

Today, sweet potatoes are prized around the world for their delicious taste and powerful health benefits. According to the Food and Agriculture Organization, China is the biggest producer of sweet potatoes, followed by Uganda, Nigeria and Indonesia. (15)

Sweet potatoes are especially popular in the United States, with North Carolina taking the lead in sweet potato production. Interestingly enough, however, sweet potato consumption in the U.S. has actually significantly declined in the last century. While the average American was eating about 29.5 pounds of sweet potato per year in 1920, average consumption today has plummeted down to just 4.1 pounds per year. (16)


Precautions with Sweet Potato Nutrition

Despite the multitude of health benefits offered by this nutritious root vegetable, there are some people who may want to limit consumption or avoid eating sweet potatoes altogether.

Although uncommon, sweet potatoes can cause an allergic reaction in some people. If you experience any food allergy symptoms after eating sweet potatoes, such as itchiness, nausea, vomiting, stomach cramps or swelling, report to your doctor right away.

If you have a history of calcium-oxalate kidney stones, you may want to limit your sweet potato intake. Sweet potatoes are high in oxalate, which can combine with calcium and lead to the development of kidney stones. (17)

Finally, if you have diabetes, be sure to keep your sweet potato intake in moderation. While sweet potatoes are jam-packed with health benefits, they also contain carbohydrates that can raise blood sugar levels when eaten in excess. Pair with some non-starchy vegetables and a good source of protein to make a well-rounded, blood sugar-stabilizing meal and enjoy.


Final Thoughts on Sweet Potato Nutrition

  • Sweet potatoes are high in fiber, antioxidants, vitamin A, vitamin C, manganese and many other important micronutrients.
  • Thanks to their impressive health profile, sweet potatoes have been associated with a long list of health benefits. Sweet potato benefits for men and women include improving eye health, enhancing immunity, boosting brain function, aiding in weight loss and regulating blood sugar.
  • Although the terms “yam” and “sweet potato” are used interchangeably, there are many differences between the sweet potato vs yam in terms of taste, appearance and nutrition.
  • There are also differences in sweet potato nutrition compared to white potatoes. Sweet potatoes are slightly lower in calories and carbs, are digested more slowly and contain a higher concentration of certain nutrients.
  • Include sweet potatoes in moderation as part of a healthy diet to take advantage of their unique health benefits, versatility and delicious flavor.

Read Next: Is Potato Starch Good for You? Pros & Cons of Potato Starch


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