Are sweet potatoes better than white potatoes for diabetes?

Comparing nutrition, glycemic load and cooking effects of the two — and which actually wins.

Written by

Carb Lens Editorial

Nutrition writers & product team

Medically reviewed by

Dr. Alicia Nguyen, RD, CDCES

Registered Dietitian · Certified Diabetes Care & Education Specialist · 12+ years clinical experience

Published July 21, 2026 3 min readEditorial policy

Sweet potatoes get a halo as a "diabetic-friendly" alternative to white potatoes. The reality is more nuanced.

The carb breakdown (1 medium, baked)

	Sweet potato	White potato (russet)
Total carbs	24g	37g
Fiber	4g	4g
Net carbs	20g	33g
GI (baked)	64	85
Glycemic load	13	28

Sweet potatoes are slightly lower in carbs, significantly lower in GI, and meaningfully lower in glycemic load.

Why sweet potatoes win on paper

Lower GI from baking
More fiber per gram
More vitamin A (huge amounts of beta-carotene)
More potassium
Slightly lower carb count

But preparation flips the script

Preparation	GI
Sweet potato, baked	64
Sweet potato, mashed	80
Sweet potato fries	70+
Sweet potato, boiled	50
White potato, baked	85
White potato, boiled then cooled	56 (resistant starch)

A cold boiled white potato actually has a lower GI than baked sweet potato.

How to eat either with diabetes

**Smaller portions**: ½ a potato is plenty
**Boil and cool** before reheating for resistant starch
**Skin on** for more fiber
**Top with protein/fat** — Greek yogurt, butter, sour cream
**Pair with a salad** to flatten the spike

The honest verdict

Sweet potatoes are marginally better for blood sugar — but neither potato is a free food. If you love white potatoes, the cooked-then-cooled trick and small portions make them workable. If you love sweet potatoes, the same rules apply.

Better alternatives

For lower carbs: - Cauliflower mash (5g net carbs/cup) - Mashed turnip (6g) - Mashed celeriac (8g) - Roasted radish (3g)

All of these are 70–90% lower carb than potatoes with similar texture and satisfaction.

About the author

Carb Lens Editorial — Nutrition writers & product team. The Carb Lens editorial team writes practical, source-checked guides on carbs, blood sugar, and everyday nutrition. Every article is drafted by our writers and cross-referenced against USDA FoodData Central and peer-reviewed clinical guidelines.

How we source and review this article

Nutrition figures come from the USDA FoodData Central database. Blood-sugar and glycemic-load framing follows guidance from the American Diabetes Association and World Health Organization healthy-diet recommendations. Every article is medically reviewed by Dr. Alicia Nguyen, RD, CDCES before publishing and re-checked on a rolling basis. See our full editorial & medical review policy.

This article is for general information and is not a substitute for medical advice. If you're managing diabetes or another condition, always defer to your care team.