Hoshi-imo is one of Japan's oldest healthy snacks: whole sweet potatoes, steamed and slowly sun-dried until naturally sweet and chewy. One ingredient. Zero additives. No refined sugar, artificial sweeteners, oil, or preservatives.
Nutrition at a glance
Per 100g serving (≈ 2–3 pieces)
That potassium number is the headline — nearly double a banana's. It also keeps a surprising amount of Vitamin C (bound to starch, so it survives the drying heat), plus Vitamin E, B6 and thiamine.
Nutritional profile overview
Who benefits most from hoshi-imo?
🏃 Athletes & active people (pre/post-workout)
Low-to-moderate GI carbs give sustained energy without the sugar crash of candy or gels. With 800+ mg potassium per 100g, it replaces electrolytes lost in sweat and helps prevent muscle cramps.
🧒 Growing children & students
Satisfies a sweet craving with zero refined sugar or additives. The chewy texture encourages thorough chewing (good for jaw development) and natural fullness.
🌿 Digestion & gut health
High in insoluble fiber plus yarapin, a natural compound unique to sweet potatoes that promotes bowel movement — a well-known home remedy for constipation in Japan.
⚖️ Dieters & healthy snackers
Virtually fat-free, and dense & chewy so it takes time to eat. A 50g serving curbs hunger for hours far better than chips or pastries.
💧 Bloating / water retention
High potassium acts as a natural diuretic, helping flush excess sodium and reduce facial or leg puffiness.
Where to buy real hoshi-imo
The best hoshi-imo comes from Ibaraki Prefecture, Japan's hoshi-imo capital. This Shirota Tamayutaka variety is additive-free, no added sugar, and ships from the farm:
Hoshi-imo "wakeari" — Shirota Tamayutaka, Ibaraki (800g–2kg)
Additive-free · no added sugar · 国産 (made in Japan). "Wakeari" = imperfect-looking but same great taste, lower price.
Prices shown are as of Oct 2026 and may change. This page contains affiliate links — if you buy through them we may earn a small commission at no extra cost to you. Nutritional values are approximate and for general information, not medical advice.