Potato

The potato is one of the world's most important staple foods. The tuber is prepared in countless cooked forms (boiled, steamed, baked, fried) and supplies high-quality carbohydrates, vitamin C, potassium and dietary fibre. Raw potato is not suitable for eating due to indigestible starch and potential solanine exposure. As a side dish, soup, stew or processed into starch and flour, the potato forms the primary caloric source in many countries.

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Raw potato juice (pressed from freshly grated tuber, taken on an empty stomach) is used in folk medicine for gastric complaints, heartburn, gastric ulcers and chronic constipation. Contains solanine and indigestible raw starch — use only in small amounts (1–2 tbsp daily), exclusively from greenness-free tubers. Traditional lore without clinical confirmation.

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Raw, thinly sliced or grated potato is used in folk medicine as a cooling compress for minor burns (grade I), sunburn and skin irritation. The cool, moist starchy mass is believed to draw out heat and soothe inflammatory reactions. Apply slices directly to the affected area, fix with gauze, change after 20–30 minutes. Not a substitute for medical wound care.

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The potato wrap (Kartoffelwickel) is a classic home-remedy application in German folk medicine: boiled potatoes are mashed, wrapped in a cloth and applied warm to the throat (for sore throat), joints (for arthritic pain) or ears (for earache). The moist heat is retained unusually well in the starchy mash (heat capacity comparable to a hot-water bottle). Allow to cool to 40–45 °C before applying to skin — risk of burns!

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Potato starch (Amylum solani) is used industrially and in the household as a thickener for sauces, soups and desserts. In naturopathy and traditional housekeeping it is also considered a mild mucous membrane protectant for diarrhoea or stomach upset (water binding in the gut, low-irritant consistency). Traditionally known as a children's remedy — now superseded by oral rehydration solutions.

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The potato is an important source of potassium (approx. 420 mg/100 g cooked tuber with skin), supporting blood pressure regulation and cardiac muscle contraction. EFSA and USDA list the potato as a significant contributor to potassium intake in European and North American diets. Cooking with skin retains the highest proportion of potassium; peeling and boiling in excess water reduces potassium content by up to 50 %.

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Fresh potatoes contain approximately 13–20 mg of vitamin C per 100 g — a remarkably high value for a starchy food. Historically the potato was an important scurvy-preventing food in Northern Europe and maritime settings. Vitamin C is lost during prolonged cooking and storage; new-season potatoes contain substantially more ascorbic acid than long-stored ones. Cooking in the skin with short cooking times best preserves vitamin C content.

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