Old (main-crop) potatoes are floury starchy tubers that supply carbohydrate energy, vitamin C, potassium, vitamin B6, and some fibre, with most of the fibre in the skin. They are a versatile staple in British cooking.
Salted boiling water adds sodium; keep cook time short and skin on to keep vitamin C losses small.
Where Potatoes, old, boiled in salted water, flesh only Stands Out
Macronutrients per 100g
Glycemic Index & Load
High GI food — causes a rapid rise in blood sugar. Best eaten in small portions combined with lower-GI foods, protein, or fat.
Glycemic Load (GL = GI × carbs ÷ 100) accounts for portion size. A moderate GL — portion size matters here.
Vitamins & Minerals
| Nutrient | Per 100g | % Daily Value* | Level |
|---|---|---|---|
| Potassium | 365 mg | 18% | |
| Chloride | 160 mg | 20% | |
| Phosphorus | 31.0 mg | 4% | |
| Folate | 18.0 µg | 9% | |
| Magnesium | 18.0 mg | 5% | |
| Vitamin C | 9.00 mg | 11% | |
| Calcium | 6.00 mg | 1% | |
| Niacin equivalents (NE) | 0.900 mg | 6% | |
| Niacin (B3) | 0.500 mg | 3% | |
| Pantothenic Acid (B5) | 0.430 mg | 7% | |
| Iron | 0.340 mg | 2% | |
| Thiamin (B1) | 0.210 mg | 19% | |
| Zinc | 0.200 mg | 2% | |
| Manganese | 0.120 mg | 6% | |
| Copper | 0.060 mg | 6% | |
| Vitamin B6 | 0.060 mg | 4% | |
| Vitamin E (alpha-TE) | 0.010 mg | 0% | |
| Vitamin D | 0.000 µg | 0% | |
| Vitamin A (RE) | 0.000 µg | 0% | |
| Riboflavin (B2) | 0.000 mg | 0% | |
| Selenium | 0.000 µg | 0% | |
| Vitamin B12 | 0.000 µg | 0% | |
| Iodine | 1.00 µg | 1% | |
| Monounsaturated fat | 0.010 g | — | |
| Polyunsaturated fat (PUFA) | 0.010 g | — | |
| Trans fat | 0.000 g | — | |
| Glucose (dextrose) | 0.300 g | — | |
| Fructose | 0.300 g | — | |
| Sucrose | 0.200 g | — | |
| Maltose | 0.000 g | — | |
| Cholesterol | 0.000 mg | — | |
| Biotin (Vitamin B7) | 0.300 µg | 1% | |
| Retinol (vitamin A) | 0.000 µg | 0% |
* % Daily Value is the proportion of an adult
EU Nutrient Reference Value (NRV) supplied by 100g of this food.
NRVs are the labelling standard — the same basis as the “%RI” figures printed on
food packaging — so these percentages are directly comparable with a shop label.
They are a single adult figure and do not vary by age or sex, which is why they
sometimes differ from UK dietary reference values: the NRV for vitamin C is 80mg
where the UK RNI is 40mg. When Nutriofia assesses your own intake in the
reports and trackers, it uses the age- and sex-specific UK values instead.
Fibre is shown without a percentage. Our fibre values use the UK
Englyst NSP method, while the published 30g daily goal is an AOAC figure — the two
are measured differently and a single percentage would mislead.
How we source and normalise our data →