NS490 Unit 2 Plant-Forward Diet in Stage G4 CKD Example

Keep the Beans, Change the Juice: A Unit 2 Renal Case Analysis of a Plant-Forward Diabetes Plan Meeting Stage G4 Kidney Disease

[Student Name]

Purdue University Global

NS490: Medical Nutrition Therapy II

Unit 2 Renal Case Analysis

[Instructor Name]

[Date]

The patient and all values are composite; the kidney disease guideline, the nutrition guideline and the potassium review cited are real.

Case Summary

Harold, 66, retired from a bus maintenance garage, is in his nineteenth year of treatment for type 2 diabetes, and his blood pressure medicine predates that. A year ago his physician encouraged a plant-forward diet for his diabetes and heart, and Harold embraced it: oatmeal with banana and a large glass of orange juice each morning, lentil or bean soup most days, baked potatoes several times a week, and less meat. His A1C fell from 8.2 to 7.1 percent and he lost 5 kg.

At his most recent visit his estimated glomerular filtration rate was 22 mL/min/1.73 m², placing him in stage G4 chronic kidney disease, and his serum potassium was 5.6 mEq/L, above the normal range. He takes lisinopril, which can raise potassium, and he recently started using a salt substitute to cut sodium. His weight is 82 kg and he is not on dialysis.

The Apparent Conflict

Two pieces of guidance seem to pull against each other. For people with chronic kidney disease, kidney guidelines favor moderating protein and suggest that plant-based eating patterns may have benefits (Stevens et al., 2024). Plant proteins come packaged with potassium, however, and Harold's potassium is high. Traditional renal diets responded to high potassium by restricting beans, lentils, potatoes, many fruits and vegetables, exactly the foods his new plan relies on.

The conflict is smaller than it looks, because Harold's potassium problem has several sources besides beans, and some of them can be changed without giving up the parts of his diet that improved his diabetes.

Protein

The nutrition guideline for chronic kidney disease suggests a protein intake of about 0.6 to 0.8 g per kilogram per day for adults with diabetes and stage 3 to 5 disease who are not on dialysis, to help slow progression while maintaining nutrition status (Ikizler et al., 2020). The newer kidney guideline suggests about 0.8 g per kilogram for people in stages G3 to G5 not on dialysis, and avoiding high intakes (Stevens et al., 2024). At 82 kg, 0.6 to 0.8 g per kilogram is 49 to 66 g per day.

A three-day food record shows Harold eats about 70 g of protein a day, a little above the range, with roughly two-thirds from plants. His plant-forward pattern already keeps protein moderate. Shifting further toward plants and slightly reducing portions of soup and beans could bring protein into range without adding animal protein.

Potassium

His potassium of 5.6 mEq/L needs attention, but the sources must be identified before foods are removed.

1. Salt substitute. Most salt substitutes replace sodium chloride with potassium chloride. A quarter teaspoon can add several hundred milligrams of potassium, in a form absorbed completely. This is likely a major contributor and the easiest to change.

2. Orange juice. A large glass every morning supplies a concentrated dose of potassium without the fiber of whole fruit.

3. Potatoes. Baked potatoes with skin are high in potassium. Boiling peeled, cut potatoes in plenty of water removes a portion of it.

4. Medicine. Lisinopril reduces potassium excretion. Whether to adjust it is his physician's decision.

5. Beans and lentils. They contain potassium, but a review of plant foods and potassium notes that potassium from whole plant foods may be absorbed less completely than from additives or juices, and that fiber may help move potassium through the gut, so the potassium on a nutrient label may overstate the effect on blood levels (St-Jules et al., 2016).

What to Keep and What to Change

Keep: oatmeal, beans and lentils at moderate portions, vegetables, and the overall plant-forward pattern that improved his A1C and weight.

Change: stop the potassium-based salt substitute and use herbs, garlic and lemon instead. Replace the large glass of orange juice with a smaller portion of a lower-potassium fruit, such as apple or berries. Prepare potatoes by peeling, cutting and boiling them, or swap some for rice or pasta. Check processed foods for potassium additives listed as potassium chloride or potassium phosphate.

Refer: share the potassium finding with his physician, who may review his lisinopril or consider a potassium binder, and who should know the diet is being adjusted.

Monitoring

Repeat potassium in two weeks after removing the salt substitute and orange juice. Recheck A1C at three months to confirm glucose control holds. At six weeks, a fresh three-day intake record should show protein landing between 49 and 66 g. Weigh monthly to watch for unintended loss, since lowering protein and changing familiar foods can reduce total intake in older adults without anyone noticing.

Talking With Harold

Harold was proud of his new diet and worried, when he heard about his kidneys, that he had harmed himself by eating so many beans. The conversation matters as much as the plan. He needs to hear that his plant-forward eating helped his blood sugar, weight and heart, and that the changes are adjustments, not a reversal. Framing the salt substitute and the juice as the first suspects, rather than his whole way of eating, keeps him engaged. He also needs a clear explanation of why potassium matters, since high levels can affect heart rhythm, and what symptoms such as muscle weakness or palpitations should prompt a call to his physician. Written examples of lower-potassium swaps, in the portions he actually eats, will help more than a long list of foods to avoid.

Why Not Simply Restrict Plants?

A traditional low-potassium diet would remove many foods that helped Harold's diabetes and heart, likely raise his intake of refined foods, and reduce fiber. Because his main potassium sources include a salt substitute and juice, restricting beans first would address a smaller contributor at a larger cost. If his potassium stays high after the first changes, more restriction can be considered with his team.

Evaluation Plan

Success would be potassium below 5.0 mEq/L within a month, protein within range, stable A1C and stable weight. If potassium does not fall, medicines get reviewed again and a more structured potassium plan follows.

Limitations

The food record relies on Harold's reporting. Potassium content varies by portion and preparation. The guidance on plant-food potassium absorption is still developing, so changes should be monitored with lab values rather than assumed to work.

References

Ikizler, T. A., Burrowes, J. D., Byham-Gray, L. D., Campbell, K. L., Carrero, J.-J., Chan, W., Fouque, D., Friedman, A. N., Ghaddar, S., Goldstein-Fuchs, D. J., Kaysen, G. A., Kopple, J. D., Teta, D., Yee-Moon Wang, A., & Cuppari, L. (2020). KDOQI clinical practice guideline for nutrition in CKD: 2020 update. American Journal of Kidney Diseases, 76(3, Suppl. 1), S1-S107. https://doi.org/10.1053/j.ajkd.2020.05.006

Stevens, P. E., Ahmed, S. B., Carrero, J. J., Foster, B., Francis, A., Hall, R. K., Herrington, W. G., Hill, G., Inker, L. A., Kazancıoğlu, R., Lamb, E., Lin, P., Madero, M., McIntyre, N., Morrow, K., Roberts, G., Sabanayagam, D., Schaeffner, E., Shlipak, M., . . . Levin, A. (2024). KDIGO 2024 clinical practice guideline for the evaluation and management of chronic kidney disease. Kidney International, 105(4, Suppl.), S117-S314. https://doi.org/10.1016/j.kint.2023.10.018

St-Jules, D. E., Goldfarb, D. S., & Sevick, M. A. (2016). Nutrient non-equivalence: Does restricting high-potassium plant foods help to prevent hyperkalemia in hemodialysis patients? Journal of Renal Nutrition, 26(5), 282-287. https://doi.org/10.1053/j.jrn.2016.02.005