Sweet Potato vs Potato: Is the Orange One Really Healthier?

Sweet potatoes have a health halo; white potatoes have a bad reputation. Order the sweet potato fries and you feel virtuous. But are they actually that different? We pulled the USDA data on both, baked — and the gap is much smaller than the marketing suggests.

The Numbers: Per 100g (Baked)

The headline most people don't expect: on calories, carbs, and protein, these two are nearly a tie. White potato even comes out slightly ahead on protein and potassium. Sweet potato has more fiber — but also five times the sugar (its natural sweetness is real sugar).

(A note on fairness: USDA lists the standard baked sweet potato as flesh only, and the baked white potato as flesh-and-skin. Eating sweet potato skin would narrow the fiber gap further — so if anything, this table is generous to the sweet potato on fiber.)

So Why the Health Halo? One Word: Vitamin A

Here's where the sweet potato genuinely earns its reputation. It's one of the richest food sources of beta-carotene, which your body converts to vitamin A. A single baked sweet potato provides well over a full day's worth of vitamin A. White potatoes have essentially none.

If that orange color is doing one thing for you, it's this. Vitamin A supports vision, immune function, and skin — and it's the one nutrient where sweet potato isn't just slightly better, it's in a different league.

Where White Potatoes Win

The white potato quietly out-performs on two fronts:

• Potassium: 535mg vs 475mg per 100g — and both beat a banana gram-for-gram. Potassium is the mineral most people under-consume, and it's the counterweight to sodium for blood pressure.
• Less sugar: 1.2g vs 6.5g. For anyone specifically minding sugar, the "plain" potato is the lower-sugar choice — the opposite of what most people assume.

White potatoes also carry a bit more protein. The much-maligned spud is a more respectable food than its reputation allows.

The Blood-Sugar Angle

This is the one place sweet potato has a modest, real edge. Its extra fiber and slightly lower glycemic index tend to produce a gentler blood-sugar rise than a baked russet, which is among the higher-GI foods. The effect isn't dramatic, and it depends heavily on preparation (boiling lowers GI; baking raises it) — but if blood sugar is your concern, sweet potato has a slight advantage.

What Actually Decides How Healthy Your Potato Is

Neither potato is the problem. The toppings and cooking method are.

A baked potato or sweet potato is a nutrient-dense, high-potassium, fiber-containing whole food. Turn either one into fries, chips, or a vehicle for butter, cheese, sour cream, and bacon, and the base vegetable becomes a rounding error. A loaded baked white potato and a marshmallow-topped sweet potato casserole are both, nutritionally, mostly the toppings.

Bottom Line

Sweet potatoes and white potatoes are far more alike than the health-halo would have you believe — nearly tied on calories, carbs, and protein. Sweet potato wins decisively on vitamin A and modestly on fiber and blood sugar; white potato quietly wins on potassium, protein, and sugar.

Eat whichever you enjoy, keep the skin on, and pay more attention to how it's cooked than to its color. Both are good — the "bad" potato was never really the potato.

Nutrition data sourced from the USDA FoodData Central database: Sweet potato, cooked, baked in skin, flesh, without salt (FDC 168483) and Potatoes, baked, flesh and skin, without salt (FDC 170093).