Final answer:
Bok choy is beneficial for toxic kidneys primarily because of its low potassium levels, which helps those with kidney dysfunction manage potassium in their blood more effectively.
Step-by-step explanation:
Bok choy is considered helpful for kidneys, especially those affected by toxins, mainly because of its low potassium levels. In kidney diseases, particularly when the kidneys are not functioning properly, the body may struggle to eliminate potassium effectively, leading to high levels in the blood.
Bok choy provides a nutrient-rich option that is lower in potassium compared to other leafy greens, making it a safer choice for those managing kidney health. It's also worth noting that while bok choy does have antioxidant properties and contains fiber, these are not the primary reason it is beneficial for toxic kidneys as indicated in the question.