Sweet Potato (Shakarkand)
One of the richest sources of beta-carotene on the planet — and despite its sweetness, it has a lower GI than regular potato. The way you cook it changes everything.
TLDR — What You Need to Know
- Sweet potato is called Shakarkand in Hindi and is one of the richest dietary sources of beta-carotene — orange-fleshed varieties provide 9444µg per 100g, converting to Vitamin A in the body
- Despite being sweeter than regular potato, boiled sweet potato has a lower glycaemic index (63) than boiled white potato (78) due to its fibre structure and resistant starch
- Cooking method dramatically changes GI: boiled sweet potato GI 63, baked sweet potato GI 94 — baking breaks down resistant starch and concentrates sugars
- Resistant starch in cooled sweet potato feeds beneficial gut bacteria (Bifidobacterium, Lactobacillus), producing short-chain fatty acids that improve gut lining health
- Purple sweet potato varieties contain anthocyanins — a distinct class of antioxidants separate from beta-carotene
- High in oxalates — kidney stone patients (calcium oxalate type) should limit intake
What Is Sweet Potato?
Sweet potato (Ipomoea batatas) is a root vegetable from the morning glory family (Convolvulaceae), originating in Central and South America. Despite sharing the word “potato” in its name, it is not closely related to the regular potato (Solanum tuberosum), which belongs to the nightshade family. Sweet potato was one of the first plants cultivated in the Americas — evidence suggests cultivation in Peru dating back 8,000–10,000 years.
In India, sweet potato is called Shakarkand in Hindi, Genasina gadde in Kannada, Sakkaravalli kizhangu in Tamil, and Ratalu or Kand in parts of western India. It is grown primarily in Odisha, West Bengal, Uttar Pradesh, and Bihar, and is a significant crop in tribal communities of Jharkhand. In Karnataka and Tamil Nadu, it is commonly roasted over coals by street vendors and sold as a seasonal snack, particularly during winter months.
Sweet potatoes come in several flesh colours — orange, white, yellow, and purple. In India, the orange-fleshed variety is most common in urban markets and is the variety referenced throughout this article unless otherwise specified. Orange flesh indicates high beta-carotene content. Purple flesh varieties (more common in Southeast Asia, Japan, and now increasingly in India) contain anthocyanins rather than beta-carotene.
Nutritional Profile
Sweet Potato — Nutrition Facts per 100g Raw
Per 100g raw
| Nutrient | Amount | % Daily Value |
|---|---|---|
| Energy | 86 kcal | — |
| Protein | 1.6 g | — |
| Total Fat | 0.1 g | — |
| Carbohydrates | 20.1 g | — |
| Dietary Fibre | 3.0 g | — |
| Beta-carotene | 9444 µg | >100% |
| Vitamin C | 20 mg | 22% |
| Vitamin B6 | 0.29 mg | 17% |
| Potassium | 337 mg | 7% |
| Manganese | 0.26 mg | 11% |
| Magnesium | 25 mg | — |
Health Benefits
1. Beta-carotene — provitamin A at exceptional levels
Sweet potato’s defining nutritional achievement is its beta-carotene content. At 9,444µg per 100g raw, orange sweet potato is one of the single richest food sources of beta-carotene on the planet — surpassing carrot (8,285µg/100g) and approaching the levels found in some fortified foods. Beta-carotene is a provitamin A compound: the body converts it to retinol (active Vitamin A) through the intestinal enzyme beta-carotene-15,15’-dioxygenase. One 100g serving of sweet potato provides well over the daily Vitamin A requirement for an adult.
Vitamin A is essential for vision (particularly night vision and the integrity of the cornea), immune function, cell differentiation, and skin barrier maintenance. Vitamin A deficiency is the leading preventable cause of childhood blindness globally. In rural India, where access to animal-source Vitamin A (retinol from liver, eggs, dairy) may be limited, sweet potato is a critical plant-source alternative. Beta-carotene from plants has a conversion ratio of approximately 12:1 (12µg beta-carotene = 1µg retinol) — lower than retinol from animal sources — but the volume in sweet potato compensates for this.
2. Glycaemic index — lower than regular potato despite sweetness
This is the most counter-intuitive fact about sweet potato: despite tasting sweeter and having more natural sugars, boiled sweet potato has a lower GI (approximately 63) than boiled white potato (approximately 78). The reason lies in the structure of the starch: sweet potato contains a higher proportion of resistant starch and fibre, which slow starch gelatinisation and digestion. The starch structure requires more time and enzymatic work to break into glucose.
However — and this is critical — cooking method changes the GI substantially. When baked, the sweet potato’s cell structure breaks down and starch gelatinises fully, raising the GI to approximately 94. This is higher than regular potato. Boiling in water preserves more resistant starch and keeps GI lower. Cooling boiled sweet potato further increases resistant starch content through a process called retrogradation (starch re-crystallises on cooling). For diabetics, boiled or boiled-then-cooled sweet potato is the preferred preparation.
3. Resistant starch and gut microbiome
Sweet potato contains meaningful amounts of resistant starch — carbohydrate that resists digestion in the small intestine and reaches the colon intact. In the colon, resistant starch is selectively fermented by beneficial bacteria including Bifidobacterium and Faecalibacterium prausnitzii. This fermentation produces short-chain fatty acids (SCFAs), especially butyrate. Butyrate is the primary energy source for colonocytes (colon lining cells) and has anti-inflammatory and anti-carcinogenic properties in the colon.
The prebiotic effect of sweet potato resistant starch supports microbiome diversity, reduces gut inflammation, and contributes to colon health over the long term. This gut benefit is enhanced when sweet potato is eaten cooled after cooking (retrogradation increases resistant starch content significantly).
4. Anthocyanins — purple varieties
Purple sweet potato varieties contain a distinct class of antioxidants — anthocyanins (specifically cyanidin and peonidin glucosides), different from and complementary to beta-carotene. These anthocyanins have potent antioxidant activity, are anti-inflammatory, and have been studied for neuroprotective and cardiovascular protective effects. Okinawa purple sweet potato is famous in longevity research as a staple of the Okinawan diet.
Side Effects and Who Should Be Cautious
Oxalate content — kidney stones: Sweet potato is high in oxalates. Patients with a history of calcium oxalate kidney stones, or those advised to follow a low-oxalate diet by their nephrologist, should limit sweet potato intake. Boiling and discarding cooking water reduces oxalate content; baking or roasting retains it.
High GI when baked: As detailed above, baked sweet potato has a GI of approximately 94 — well into the high-GI range. Diabetics and those managing blood sugar should avoid baking and choose boiling or steaming instead.
Caloric density: At 86 kcal per 100g, sweet potato is the highest-calorie vegetable covered in this series. For those managing caloric intake for weight loss, portion control is important — 200g of sweet potato (a moderate serving) provides 172 kcal. This is not problematic in the context of balanced meals but becomes significant if eaten in large amounts frequently.
Vitamin A toxicity — this does NOT apply to beta-carotene: Beta-carotene, unlike preformed Vitamin A (retinol), does not cause Vitamin A toxicity (hypervitaminosis A) at high dietary intake. The body regulates conversion of beta-carotene to retinol — when retinol levels are adequate, conversion slows. Very high beta-carotene intake causes harmless yellow-orange skin colouration (carotenodermia) in some people, which resolves when intake decreases.
Organic vs Conventional
Sweet potato’s status is closer to the “Dirty Dozen” than most root vegetables. It is commonly grown with synthetic pesticides and nematicides in Indian commercial farming, and as a root crop it absorbs soil-applied chemicals. Choose organic when possible, particularly for children consuming sweet potato regularly as a weaning food or snack.
How to Select and Store
Selecting: Choose firm, smooth sweet potatoes with no soft spots, cracks, or signs of sprouting. The skin should be taut and even-coloured — uniform deep orange or tan depending on the variety. Avoid those with wrinkling or shrivelling, which indicates dehydration and reduced starch quality.
Storing: Cool, dark, dry, and well-ventilated — not the refrigerator. Refrigeration converts sweet potato starch to sugar too rapidly and damages the texture. A cool pantry, vegetable basket, or store room at 13–15°C keeps sweet potatoes in excellent condition for 2–3 weeks. Do not wash before storing. Do not store near onions or potatoes — they emit ethylene gas that accelerates sprouting.
Sweet Potato vs Regular Potato vs Yam
| Parameter (per 100g) | Sweet Potato | Regular Potato (white) | Yam (kanda) |
|---|---|---|---|
| Calories | 86 kcal | 77 kcal | 118 kcal |
| Beta-carotene | 9444µg | ~0 | ~0 |
| Glycaemic Index (boiled) | ~63 | ~78 | ~54 |
| Dietary Fibre | 3.0g | 2.1g | 4.1g |
| Vitamin C | 20mg | 20mg | 17mg |
| Resistant starch | Medium-high | Medium | High |
| Potassium | 337mg | 421mg | 816mg |
| Best cooking method for GI | Boiling | Boiling | Boiling |
Sweet potato leads decisively on beta-carotene and antioxidant content. Yam has the highest fibre and potassium but minimal Vitamin A. Regular potato has the highest GI of the three when boiled. All three are nutritious — diversity in consumption is the best strategy.
A naturally sweet, warming winter dessert that requires no added sugar if the sweet potatoes are ripe. The ghee and cardamom complement the earthy sweetness perfectly.
Key Ingredients
400g sweet potatoes, boiled and peeled · 2 tbsp A2 cow ghee · 1/4 cup full-fat milk · 3–4 cardamom pods, crushed · 1 tbsp jaggery or to taste (may not be needed if sweet potatoes are very sweet) · 8–10 cashews, halved · 8–10 raisins · A pinch of saffron strands soaked in 1 tbsp warm milk (optional)
Home Test: Iodine Starch Test for Sweet Potato — Distinguishing from Yam
Steps
- 1 Cut a small piece of the root and place on a white plate
- 2 Apply 2–3 drops of diluted iodine solution (tincture of iodine diluted 1:10 with water) to the cut surface
- 3 Observe the colour change within 30 seconds
- 4 Sweet potato starch reacts with iodine to produce a dark blue-black colour
- 5 Yam (suran/kanda) also stains dark — use this test primarily to distinguish from non-starchy produce sold as sweet potato in some markets
- 6 Check for consistency of flesh colour throughout — orange flesh should be uniformly deep orange, not patchy white
Pure / Pass
Uniform dark blue-black iodine reaction confirming starch presence. Uniformly deep orange flesh throughout when cut. This is genuine sweet potato with intact starch content.
Adulterated / Fail
Pale or inconsistent iodine reaction suggesting low starch (underripe or mislabelled product). Patchy white interior despite orange skin — may indicate artificial colouring of skin, or a different variety than labelled.
Available at Organic Mandya
Organic Sweet Potato
Grown without synthetic pesticides. Deep orange flesh — maximum beta-carotene. Harvested at peak sweetness.
Frequently Asked Questions
Q Can diabetics eat sweet potato?
Can diabetics eat sweet potato?
Yes, with attention to preparation method. Boiled sweet potato has a GI of approximately 63 — lower than white potato. However, baked sweet potato has a GI of approximately 94, which is unsuitable for blood sugar management. Diabetics should eat boiled sweet potato in moderate portions (100–150g), preferably cooled after cooking (cooling increases resistant starch), and monitor their individual glucose response.
Q Is sweet potato better than regular potato nutritionally?
Is sweet potato better than regular potato nutritionally?
For Vitamin A and antioxidants, sweet potato is far superior — no other common vegetable approaches its beta-carotene content. Sweet potato also has a lower GI when boiled. Regular potato has more potassium and is equally versatile. Neither is inherently superior; diversity of consumption is more important. If choosing between the two for nutritional density per calorie, sweet potato edges ahead on most parameters.
Q Why does sweet potato turn sticky after cooking?
Why does sweet potato turn sticky after cooking?
Sweet potatoes have a high sugar and moisture content. During cooking, starch gelatinises and sugars concentrate — particularly near the skin and cut surfaces. The stickiness is the concentration of sugars and soluble fibre. It is not a sign of spoilage or artificial additive. Some varieties are naturally stickier (higher moisture and sugar) than others.
Q Can sweet potato be eaten raw?
Can sweet potato be eaten raw?
Sweet potato can be eaten raw — it is crunchy and mildly sweet, used raw in some salads and slaws. However, raw sweet potato contains enzyme inhibitors (trypsin inhibitors) that can reduce protein digestion, and the starch is harder to digest raw. Light cooking significantly improves both digestibility and bioavailability of beta-carotene. For maximum nutrition, eat cooked with a small amount of fat (ghee, coconut oil) to improve fat-soluble beta-carotene absorption.
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.