"Sweet potatoes are the healthy potato" is one of those nutrition truisms that's mostly — but not entirely — right. The full picture depends on how each is cooked.
The numbers (1 medium, ~150g, baked)
| Metric | Sweet potato | White potato |
|---|---|---|
| Calories | 112 | 161 |
| Net carbs | 23g | 33g |
| Sugar | 7g | 2g |
| Fiber | 4g | 3g |
| GI | 63 (medium) | 78 (high) |
| Glycemic Load | 14 | 26 |
By glycemic load (the metric that matters most for blood sugar), sweet potato is roughly half the hit of white potato per serving.
Cooking flips the answer
- **Baked & cooled white potato** drops to a GI of ~50 because resistant starch forms
- **Mashed sweet potato with butter and brown sugar** can spike harder than a baked plain white potato
- **French fries** of either type spike fast because oil-cooked starch digests quickly
- **Boiled new potatoes** are the lowest-impact way to eat white potato
Real-world blood sugar response
For a diabetic eating either potato plain with a protein source: - Sweet potato: ~30-50 mg/dL rise - White potato: ~60-90 mg/dL rise
The gap shrinks when both are eaten with protein, fat and fiber on the same plate.
Bottom line
Sweet potato wins on carb count, fiber and glycemic load. But how you cook it and what you eat alongside it matters more than which orange or yellow tuber you picked.