Banana Stem — Vazhathandu
The inner stem of the banana plant. A South Indian superfood for kidney health, digestion, and detoxification. 31 kcal, 5.7g fibre, 553mg potassium.
TLDR — What You Need to Know
- Banana stem (Vazhathandu in Tamil, Baledintu in Kannada) is the inner core of the banana plant pseudostem — a crisp, mild-flavoured vegetable widely used across South India
- Potassium 553mg per 100g — among the highest of any common vegetable; supports kidney stone prevention by reducing urinary calcium excretion
- Fibre 5.7g per 100g — high insoluble and soluble fibre that supports bowel regularity and feeds beneficial gut bacteria
- Traditional kidney stone remedy: banana stem juice is used in Ayurvedic and folk medicine to dissolve calcium oxalate kidney stones — supported by preliminary animal and in vitro evidence
- Powerful diuretic: increases urine output, helps flush the urinary tract — useful for UTI prevention and kidney health
- Very low calorie at 31 kcal per 100g — excellent for weight management while providing high fibre satiety
What Is Banana Stem?
The banana plant is not a tree — it is technically the world’s largest herbaceous plant. What appears to be a trunk is actually a pseudostem: tightly wrapped leaf sheaths. The banana stem used in cooking is the tender inner core of this pseudostem, harvested after the banana bunch has been cut and the plant would otherwise be discarded.
In South Indian cuisine, banana stem (Vazhathandu in Tamil, Baledintu or Arati Dunna in Kannada/Telugu) has been used for centuries as a vegetable and a medicinal food. It is available fresh in vegetable markets, particularly abundant after banana harvests when farmers cut the pseudostem.
The edible portion is the pale, creamy-white inner cylinder — it must be peeled through several outer fibrous layers before the tender core is reached. The fibres running through the stem are edible but fibrous — traditional preparation involves pulling out the long fibres after cutting (or keeping them, as some cooks prefer the extra fibre).
Banana stem is mildly astringent and slightly crisp when raw, becoming tender and mild when cooked. It absorbs the flavours of whatever it is cooked with, making it a versatile ingredient in dals, raitas, stir-fries, and curries.
Nutritional Profile
Banana Stem — Nutrition Facts per 100g
Per 100g raw banana stem (inner core)
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Energy | 31 kcal | — |
| Protein | 0.3 g | — |
| Total Fat | 0.1 g | — |
| Carbohydrates | 7.1 g | — |
| Dietary Fibre | 5.7 g | 20% |
| Potassium | 553 mg | 12% |
| Iron | 0.6 mg | 3% |
| Calcium | 30 mg | 3% |
| Phosphorus | 30 mg | — |
| Vitamin B6 | 0.3 mg | 18% |
| Vitamin C | 7 mg | 8% |
| Magnesium | 41 mg | 10% |
Health Benefits — What Does Science Say?
1. Kidney stone prevention and dissolution — the primary traditional use
Banana stem juice is one of the oldest Ayurvedic and South Indian folk remedies for kidney stones (nephrolithiasis). The scientific rationale:
- High potassium (553mg/100g): dietary potassium reduces urinary calcium excretion. Since 80% of kidney stones are calcium oxalate, reducing urinary calcium directly reduces stone formation risk
- High magnesium (41mg/100g): magnesium in the urinary tract binds oxalate, competing with calcium and reducing calcium oxalate crystal formation
- Diuretic effect: increased urine output flushes the urinary tract and dilutes calcium and oxalate concentrations, reducing the likelihood of crystal precipitation
Preliminary animal studies (Narmada et al., 2012) and in vitro studies have shown banana stem extract reduces calcium oxalate crystal formation. Human clinical trials are limited, but the mechanistic basis is sound and the traditional use is well-established across Tamil Nadu, Karnataka, Andhra Pradesh, and Kerala. Banana stem juice (100–150ml daily) is a widely practised home remedy for small kidney stones.
Important caveat: Banana stem reduces calcium oxalate stones. If you have uric acid stones or struvite stones, the mechanism is different — consult a urologist.
2. Diuretic and UTI support
Banana stem increases urine output through its high water content, potassium, and specific phytochemical compounds. Increased urination flushes bacteria from the urethra and bladder, which is why banana stem is traditionally recommended during urinary tract infections. This is a supportive measure — not a replacement for antibiotics in confirmed bacterial UTI.
3. Prebiotic fibre for gut health
At 5.7g fibre per 100g, banana stem provides both soluble fibre (which forms a gel, slowing glucose absorption and feeding Bifidobacterium species) and insoluble fibre (which adds bulk to stool and speeds intestinal transit). Regular consumption supports bowel regularity, reduces constipation, and lowers the risk of colorectal cancer through SCFA production.
4. Blood sugar management
The high fibre content of banana stem slows the digestion and absorption of carbohydrates, resulting in a lower glycaemic response. Traditional Ayurvedic practitioners recommend banana stem for Type 2 diabetes management. While dedicated clinical trials are limited, the fibre mechanism is well understood and consistent with diabetes dietary guidelines that emphasise high-fibre, low-GI foods.
5. Weight management — high volume, low calorie
At only 31 kcal per 100g with 5.7g of fibre, banana stem is one of the most satiating low-calorie foods available. A 200g serving of banana stem raita or curry provides about 60 kcal while delivering over 10g of fibre and substantial meal volume — an ideal combination for calorie-controlled diets.
Side Effects and Cautions
Kidney disease and potassium restriction. The very high potassium content (553mg/100g) that makes banana stem beneficial for healthy kidneys makes it risky for those with CKD (chronic kidney disease) who are on a low-potassium diet. CKD patients must check with their nephrologist before consuming banana stem regularly.
Diuretic interaction with medications. The diuretic effect of banana stem can interact with prescription diuretics (furosemide, hydrochlorothiazide), potentially causing excessive potassium loss or enhanced blood pressure lowering. Those on diuretic medications should moderate banana stem intake and monitor blood pressure.
Blood pressure medications. The potassium in banana stem can interact with ACE inhibitors and angiotensin receptor blockers (ARBs), which also raise potassium. Combining high dietary potassium with these drugs can occasionally cause hyperkalemia (elevated blood potassium). Those on these medications should be aware.
Organic vs Conventional
Banana stem comes from the same plant as the banana — so pesticide concerns that apply to banana production apply to banana stem as well. However, because banana stem is not a commercially sold commodity (it is primarily a local produce market item), it tends to come from smaller traditional farms with lower pesticide loads than commercial banana plantations. Look for banana stems from certified organic sources or directly from local farmers.
How to Select and Store
Selecting:
- Choose banana stems that feel firm and heavy for their size
- The cut end should look fresh — not dried or darkened
- The outer layers should be bright, slightly waxy, and tightly wrapped
- Freshly cut banana stem will have a milky sap at the cut end — a sign of freshness
Preparing:
- Remove the outer 2–3 tough fibrous layers to reach the tender inner core
- As you cut, pull out the long fibres (string-like threads) that run through each round slice
- Immediately soak cut pieces in water with a squeeze of lemon juice or buttermilk — banana stem oxidises rapidly and turns pinkish-brown on exposure to air (like an apple)
- Soaking in buttermilk (traditional method) also slightly softens the astringency
Storing:
- Uncut: refrigerate for up to 1 week
- Cut and cleaned: submerge in water in the refrigerator; use within 2–3 days
- Change soaking water daily
Banana Stem vs Other High-Fibre Vegetables
Banana Stem vs Young Jackfruit vs Raw Banana — Fibre and Kidney Health
| Parameter | Banana Stem | Young Jackfruit | Raw Banana (Pachabale) |
|---|---|---|---|
| Calories (per 100g) | 31 kcal | 95 kcal | 89 kcal |
| Fibre | 5.7g | 1.5g | 2.6g (resistant starch ~12g) |
| Potassium | 553mg | 303mg | 358mg |
| Magnesium | 41mg | 29mg | 27mg |
| Kidney stone benefit | Strong (diuretic, high K, Mg) | Moderate | Moderate (resistant starch, K) |
| Diuretic effect | Strong | Mild | Mild |
| Protein | 0.3g | 1.7g | 1.1g |
| Traditional use | Kidney stones, UTI, digestion | Meat substitute, digestion | Energy, diabetes, gut health |
| Availability | Seasonal, local markets | Seasonal | Year-round |
Values per 100g raw. Young jackfruit data from USDA #09144. Resistant starch content in raw banana estimated from published literature.
Recipes
Banana Stem Raita (Vazhathandu Pachadi)
A cooling South Indian yogurt-based dish that combines the high-fibre banana stem with the probiotics of curd. The lactic acid in curd helps with mineral absorption. This dish is gentle on the digestive system and excellent for kidney health when eaten regularly.
Key Ingredients
200g banana stem (cleaned, finely chopped, soaked in buttermilk) · 1 cup fresh curd (A2 if available) · 1 tsp coconut oil · Mustard seeds, curry leaves, green chilli · Grated fresh coconut · Salt and coriander to finish
Banana Stem Dal (Vazhathandu Kootu)
Banana stem cooked with toor dal (split pigeon pea) — one of South India's most nutritionally complete everyday dishes. The dal provides protein and lysine; the banana stem contributes fibre, potassium, and iron. Together they form a complete amino acid and micronutrient profile.
Key Ingredients
200g banana stem (cleaned and chopped) · 100g toor dal (cooked) · 1 tsp coconut oil · Mustard seeds, curry leaves, dried chilli · Grated coconut, cumin (ground) · Turmeric, salt
Adulteration Test
Home Test: Freshness and Source Verification for Banana Stem
Steps
- 1 Examine the cut end of the banana stem — press with your thumb gently
- 2 Peel back one outer layer and observe the inner colour
- 3 Smell the cut surface
Pure / Pass
Cut end should feel firm and yield slightly milky sap when pressed. Inner layers are creamy-white to pale ivory. Smell is fresh, mildly astringent, and clean — similar to raw banana.
Adulterated / Fail
Dry or browned cut end with no sap indicates old stock (more than 3-4 days post-harvest). Pinkish-brown inner flesh or sour smell indicates decay. Avoid.
Available at Organic Mandya
Banana Stem (Vazhathandu)
Fresh banana stem. Naturally grown. For kidney health, digestion, and weight management.
Frequently Asked Questions
Q Does banana stem really dissolve kidney stones?
Does banana stem really dissolve kidney stones?
Banana stem does not dissolve large stones already formed — it is not a replacement for lithotripsy or urological treatment. However, regular consumption of banana stem juice (100-150ml daily) may help pass small stones by increasing urine output and alkalising the urine. The high potassium and magnesium content help prevent new stone formation by reducing urinary calcium. Consult a urologist for existing kidney stones.
Q How much banana stem should I eat daily for kidney health?
How much banana stem should I eat daily for kidney health?
Traditional recommendations suggest 100-150ml of banana stem juice on an empty stomach, or 100-150g of cooked banana stem in curries or raitas, 3-4 times per week. This is not a medically prescribed dose but a traditional guideline that aligns with the nutritional profile. Those with kidney disease must check with their nephrologist before increasing intake.
Q Can banana stem be eaten raw?
Can banana stem be eaten raw?
Yes, very finely shredded raw banana stem can be eaten in salads with lemon juice, salt, and coconut. The astringency is more pronounced when raw. Soaking in buttermilk or lemon water for 10-15 minutes before eating reduces astringency. Cooking is the more common preparation method in South Indian cuisine.
Q Is banana stem good for weight loss?
Is banana stem good for weight loss?
Yes. At 31 kcal per 100g with 5.7g of fibre, banana stem is one of the most filling low-calorie foods available. A 200g serving provides approximately 60 kcal and over 10g of fibre, which significantly reduces hunger and delays gastric emptying. Including it regularly in a calorie-controlled diet supports satiety without adding calorie density.
Last updated: March 2026
Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your doctor or a qualified healthcare provider before making dietary changes, especially if you have a medical condition.