It’s not that these foods are bad. It’s that your heart, kidneys, and medications change how your body handles salt, potassium, and metabolism. Bananas High potassium. If your kidneys are struggling or you’re on spironolactone or ARNI, potassium can build up too high. Grapefruit Changes how your liver breaks down medications. Especially dangerous after transplant. It can push drug levels way past safe. Spinach Also high potassium. And it affects warfarin consistency. Healthy, but needs consisten