Low Potassium Bread: What CKD Patients Need to Know

White Bread vs. Whole Grain Bread: Which is better for kidneys?

Do You Need to Restrict Potassium?

Many people with kidney disease assume they need to restrict potassium—even when it’s unnecessary (and potentially harmful). Most individuals with CKD who are not on dialysis have enough kidney function to handle typical day-to-day potassium intake.

If you’re struggling with high potassium levels, it’s important to rule out other causes. Many factors can affect potassium levels beyond the food you eat.
We offer a free mini-course,  5 Ways to Control Potassium Without Avoiding High Potassium Foods, to help you confidently manage your potassium levels.

If potassium restriction is necessary, choosing a lower potassium bread—such as white bread—may help. Still, the difference is often small: one ounce of white bread has ~38 mg of potassium, while an ounce of wheat bread has ~76 mg. This difference is minimal in the context of your overall diet.

Are you getting adequate fiber?

White bread is typically lower in fiber than whole wheat or whole grain bread. If you’re not meeting your daily fiber needs, opting for a higher-fiber bread may be more beneficial than choosing based solely on potassium content.

The recommended daily fiber intake for most adults is at least 25g. Whole grains are excellent sources of fiber. Adequate fiber supports gut health and may help maintain normal potassium levels in people with CKD.

Do you have diabetes?

Whole grain bread generally has a lower glycemic index due to its higher fiber, slightly higher fat content, and more complex carbohydrates. If you’re managing blood sugar levels, a whole grain bread may be a better choice than refined white bread.

Are you getting enough magnesium?

Whole grain breads contain about three times more magnesium than white bread. Nearly half of U.S. adults fall short of the recommended magnesium intake: 420 mg/day for men over 30, and 320 mg/day for women.

Low magnesium intake is associated with a variety of health issues, including:

• Type 2 diabetes
• Metabolic syndrome
• Elevated C-reactive protein
• High blood pressure
• Heart disease
• Osteoporosis
• Migraines
• Asthma
• Colon cancer

If your diet is low in magnesium, choosing whole grain bread over white bread may help.

What is your preference?

Sometimes, it comes down to taste. If you strongly prefer white bread and are meeting your nutrient needs in other ways, it’s probably okay to stick with it.

For some people, whole grains may be an acquired taste—the more often you eat them, the more you may grow to enjoy the taste and texture.

What if I can’t find a low sodium bread?

If your local store doesn’t carry low sodium options:

• Try an alternative:
  Make a lettuce wrap or use low-sodium corn tortillas instead of sandwich bread. Swap toast for oatmeal or rice.
• Order online:
  Many breads can now be ordered directly and shipped to your home.
• Request it:
  Ask your grocery store to carry your preferred brand.
• Pair with low sodium foods:
  If you must use a higher sodium bread, pair it with low sodium toppings like natural peanut or cashew butter to keep the total sodium in check.

Lower Phosphorus Bread

Many breads also contain phosphorus additives, which are bad for your cardiovascular health. Phosphorus is an ingredient in baking powder, so it is common for baked goods to have phosphorus added to them. However, not all bread contains phosphorus!

To determine if a bread contains phosphorus, read the ingredient lists. If you see any ingredients with “PHOS” in the name, then you should choose a different bread.

One thing to consider with bread is that most bread contains yeast. While humans do not have the correct enzymes in their body to digest many plant-based phosphorus sources, yeast organisms do. In theory, foods containing yeast may have a higher phosphorus bioavailability, meaning that your body will absorb more of the phosphorus from the food.

Available research on the amount of phosphorus in yeast leavened bread that is absorbable is anywhere from 26 – 60% digestible. Phosphorus additives, on the other hand, are 100% absorbable.

If you are struggling with high phosphorus levels, I would first be sure that you have eliminated all sources of phosphorus additives in your diet.  You should also take a look at any digestive enzymes that you take to ensure those are not affecting your phosphorus.

If you have eliminated all phosphorus additives in your diet and are still struggling with controlling phosphorus, then you may want to consider replacing yeast containing foods like bread with alternate sources of carbohydrate. Similarly, sprouted grains will have a higher phosphorus bioavailability.