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Zwieback

Per 100 g edible portion
Prepared Foods
ModerateMeasured against KDIGO/KDOQI daily limits, Zwieback is Moderate: the highest item, Potassium, sits at 15% of its limit.

Phosphorus / Sodium / Potassium (rating basis)

Phosphorus55 mg6%
Low
Sodium227 mg11%
Low
Potassium305 mg15%
Moderate

About this food

Zwieback is a common member of Prepared Foods. The mineral columns on this page come from the USDA database and are rated against the daily limits used across this site. This helps when choosing similar foods.

Nutrient insight

Potassium is the highest of the three at 15%. With reduced kidney function, blood potassium can rise, so spread high-potassium foods across the day rather than in one large serving.

Other nutrients

Protein10.1 gNot rated; needs attention at stage 4-5
Fiber2.5 gBeneficial for CKD (core plant-based nutrient)
Sugar (total)12.5 gMay contain added sugar
Alcohol0 gAlcohol-free
PurineNo dataNot rated · reference for those with high uric acid
OxalateNo dataNot rated · reference for those with kidney stones
Phosphorus source: Processed additive (highest absorption) · Potassium form: Processed or concentrated

Practical tips

How to eat it more safely: Keeping the portion moderate and the preparation plain helps the minerals stay within the daily limits.

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Related guides

Prepared FoodsModerate foodsLow potassium foodsLow sodium foods

Frequently asked questions

Is Zwieback safe for kidney disease?

Zwieback is rated Moderate: Potassium is 15% of the CKD stage 3-4 limit, the highest item. Individual needs should be discussed with your healthcare team.

Why is Zwieback rated Moderate?

Zwieback's Potassium content (305 mg) equals 15% of the limit, sitting in the 15-25% band - that is why it rates Moderate.

How much Potassium is in Zwieback?

In every 100 g of Zwieback, Potassium is about 305 mg - roughly 15% of the daily limit (2,000 mg).

Is Zwieback safe on a low-potassium diet?

For people watching potassium, Zwieback exceeds 300 mg per 100 g, with Potassium at 305 mg. Confirm your personal limit with your nephrologist or renal dietitian.

How does Zwieback compare to other prepared foods foods?

Against the Prepared Foods average, Zwieback shows more Potassium (305 mg per 100 g). The tier shown here comes from its own numbers, not the category.