A medication that helps protect kidney function in some patients may have an under-recognized side effect, according to a real-world study published on August 18, 2026 in Scientific Reports (a Nature journal). The finding matters for a specific group — adults with chronic kidney disease and type 2 diabetes — and it is worth understanding even if you are reading this as a food-reference site and not a medication guide.
The team used the TriNetX US Collaborative Network, pulling a new-user cohort from June 2021 to June 2024. Finerenone initiators were matched one-to-one against people starting spironolactone, SGLT2 inhibitors, or ACE inhibitors/ARBs, and the primary outcome was a new nephrolithiasis diagnosis in the 4 to 16 months after starting. The hazard ratios were 1.328 (95% CI 1.065-1.657) versus spironolactone, 1.483 (1.118-1.967) versus SGLT2 inhibitors, and 1.495 (1.145-1.953) versus ACEi/ARB. The association held across subgroups, including those with diabetes and hypertension.
The contrast that stands out is the SGLT2-inhibitor side. Those drugs have shown a stone-protective signal in earlier work, and here finerenone appeared to work against that signal when the two were combined. None of this establishes causation — it is an observational, real-world comparison — but it is a signal large enough to flag.
Two lessons carry over to the diet side. First, kidney stone risk is never just about food — it is food plus medication plus hydration plus the underlying condition, and a person with CKD and diabetes already sits at the intersection of several stone risks. Second, the diet and fluid habits that matter for stones are the same ones a person on any of these drugs still needs: enough water, controlled sodium, and modest animal protein. The medication question itself belongs to the prescribing doctor, not to a food database.
The diet and fluid habits that support stone prevention stay the same regardless of medication:
| Food | Oxalate (mg) | Serving | Rating |
|---|---|---|---|
| Lemonade | 2 mg | 1 cup | Safe |
| Watermelon | 2 mg | 1 cup cubed | Safe |
| Chicken breast, roasted | 0 mg | 4 oz | Safe |
| Cheese, hard and soft | 1 mg | 1 oz | Safe |
| Spinach | 590 mg | 1 serving | Avoid |
The pattern is familiar: low-oxalate produce, dairy, and modest protein sit safe, while the high-oxalate greens need portion awareness. Water stays the single highest-value habit, whatever else is in the picture.
See how oxalate values are measured and verified on our data methodology page.