Overview
About Sweet Potato
Despite the name, sweet potato is not a nightshade.
It belongs to the morning glory family (Ipomoea batatas), while the white potato is the actual nightshade (Solanum tuberosum), so people avoiding nightshades can usually eat sweet potato freely. Its real trigger is oxalate: sweet potato is high in oxalate, with roughly 97 mg in a medium one, which matters for anyone prone to calcium-oxalate kidney stones.
Sensitivities
How Sweet Potato scores
Watch for
What trips people up
- High in oxalate, around 97 mg per medium sweet potato, a meaningful amount for anyone managing calcium-oxalate kidney stones or on a low-oxalate diet
- Not a nightshade: it is in the morning glory family, unlike the white potato, so nightshade-sensitive people generally tolerate it
- Moderate salicylate and moderate polyols, so a large portion can also add up for sensitive guts
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Sweet Potato
Is sweet potato a nightshade?
No. Sweet potato is in the morning glory family (Ipomoea batatas), not the nightshade family. The confusion comes from the shared word potato, but the true nightshade is the white or Irish potato (Solanum tuberosum), alongside tomatoes, peppers and eggplant. If you avoid nightshades, sweet potato is generally fine.
Are sweet potatoes bad for kidney stones?
They can be if you are a calcium-oxalate stone former. Sweet potatoes are high in oxalate, with about 97 mg in a medium one, close to a whole day of a low-oxalate allowance. Boiling leaches some oxalate into the water, and keeping portions modest helps, but frequent large servings are worth watching if you get oxalate stones.
What is a lower-oxalate swap for sweet potato?
White rice is very low in oxalate and makes an easy starch swap. Zucchini and cabbage are also much lower in oxalate while still being nightshade-free, so they work well if you are managing both stones and nightshade sensitivity.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.