Sweet Potato vs Corn: Which Is Better for Kidneys?

Q: Which has more phosphorus, sweet potato or corn?

Per 100 g, sweet potato contains 32 mg and corn contains 77 mg of phosphorus.

Q: Is sweet potato or corn better for kidney disease?

Based on CKD stage 3-4 daily limits, sweet potato is rated kidney-friendly and corn is rated kidney-friendly. Ratings reflect mineral load per 100 g only — individual advice should come from your healthcare team.

Q: What is the main difference for a CKD diet?

The largest difference is phosphorus: sweet potato sits at 3% of the daily limit versus 8% for corn. See each food page for the full mineral profile.

Comparing Sweet Potato and Corn per 100 g: Sweet Potato rates Kidney-friendly, while Corn rates Kidney-friendly under CKD stage 3-4 daily limits. The biggest gap is Phosphorus — Sweet Potato sits at 3% of the daily limit versus 8% for Corn.

Sweet Potato
Kidney-friendly Corn
Kidney-friendly

Phosphorus

32 mg

77 mg

Sodium

27 mg

1 mg

<1%

Potassium

230 mg

12%

218 mg

11%

See Sweet Potato details See Corn details

Frequently asked questions

Which has more phosphorus, sweet potato or corn?

Per 100 g, sweet potato contains 32 mg and corn contains 77 mg of phosphorus.

Is sweet potato or corn better for kidney disease?

Based on CKD stage 3-4 daily limits, sweet potato is rated kidney-friendly and corn is rated kidney-friendly. Ratings reflect mineral load per 100 g only — individual advice should come from your healthcare team.

What is the main difference for a CKD diet?

The largest difference is phosphorus: sweet potato sits at 3% of the daily limit versus 8% for corn. See each food page for the full mineral profile.