Not Sweet Potato Leaves! Taiwan's Top 5 Most Affordable Super Greens, Recommended by Doctors: Stabilize Blood Sugar, Reduce Inflammation, Nutrient-Rich and Budget-Friendly

Many kidney disease patients, fearing high potassium levels in vegetables, blindly avoid greens, which can worsen their health. Nephrologist Dr. Hung Yung-hsiang shared a case on his Facebook fan page: a 55-year-old man discovered his glomerular filtration rate (eGFR) had dropped to 60 during a health checkup. Fearing high blood potassium, he avoided vegetables entirely, leading to severe constipation and poor mental condition months later. Under medical guidance, he started eating 'cruciferous vegetables' for three months. His constipation and energy levels improved significantly, and his eGFR rebounded to 76.

55-Year-Old Man Avoids Vegetables Fearing Dialysis, Suffers Severe Constipation — Doctor Recommends 5 Cruciferous Vegetables: Kidney Function Improves After 3 Months

When sharing this case on his Facebook page, nephrologist Dr. Hung Yung-hsiang emphasized that poor kidney function does not mean vegetables should be avoided altogether — rather, patients must learn how to choose wisely. Diet should be adjusted based on individual kidney function, blood potassium levels, and nutritional status, not by banning all vegetables.

Dr. Hung advises that if kidney patients need to control potassium intake, they can reduce potassium content in vegetables by cutting them into small pieces, blanching them first, and discarding the cooking water.

Must-Eat for Kidney Health! Doctor’s Ranked List of 'Top 5 Cruciferous Vegetables'

Dr. Hung Yung-hsiang compiled a ranked list of the 5 cruciferous vegetables most beneficial for kidney health:

5th Place: Bok Choy

High in water and low in calories, bok choy is rich in dietary fiber and vitamin C. It helps control weight and stabilize blood sugar, effectively reducing the risk of chronic inflammation — crucial for maintaining kidney health.

4th Place: Cabbage

Rich in vitamin C, vitamin K, and various phytochemicals, cabbage also provides abundant dietary fiber. Many kidney patients suffer from fiber deficiency and constipation due to strict dietary restrictions. Eating moderate amounts of cabbage can improve intestinal motility.

3rd Place: Cauliflower

Recently popular as 'cauliflower rice' to replace part of white rice, cauliflower contains vitamin C and cruciferous-specific phytochemicals. Its potassium content is lower than other dark green vegetables, making it kidney-friendly for patients needing potassium control.

2nd Place: Kale

Extremely nutrient-dense, kale is rich in lutein, carotenoids, flavonoids, and the key compound sulforaphane. Sulforaphane enhances cellular antioxidant defense, helping slow down the two major drivers of chronic kidney disease progression: oxidative stress and chronic inflammation.

1st Place: Broccoli

One of the most extensively researched cruciferous vegetables, broccoli is rich in glucosinolates, which convert to sulforaphane upon chewing. It has potent antioxidant and anti-inflammatory effects, effectively activating the body’s natural defense mechanisms.