Potatoes for Prediabetes: A UK Supermarket Guide
By PrediabetesBasket · Published · Last reviewed
Potatoes are a familiar part of many UK meals, but after being told you have prediabetes it is understandable to wonder whether they still fit.
They do contain carbohydrate, so portion size matters. The type of potato, how it is cooked and what you serve with it can matter too.
You don’t need a specialist potato or a completely different way of eating. It is more useful to understand the choices already available in the supermarket.
Potatoes and prediabetes
The Eatwell Guide places potatoes in the starchy-carbohydrate group alongside bread, rice and pasta.
UK guidance recommends choosing higher-fibre starchy foods where possible, including eating potato skins when practical.
NICE guidance for people at higher risk of type 2 diabetes also encourages increased fibre and vegetables and reducing excess saturated fat.
The question therefore isn’t simply whether you can eat potatoes. Portion size, preparation and the rest of the meal all deserve attention.
Portion size matters
Potatoes contain carbohydrate, so portion size is important whichever variety you choose.
The type of potato and how it is cooked can also affect its glycaemic response.
The British Dietetic Association notes that the total amount of carbohydrate eaten can have a greater effect on blood glucose than GI alone. Individual carbohydrate requirements vary, so there isn’t one portion that suits everybody.
A moderate serving of potatoes with vegetables and a source of protein is a different meal from one in which most of the plate is made up of chips or mash.
What about new potatoes?
Different potatoes can have different glycaemic index values.
The British Dietetic Association currently lists new potatoes eaten with their skins among lower-GI potato choices, boiled potatoes among medium-GI choices and jacket potatoes among higher-GI choices. Sweet potato and yam are also listed among lower-GI choices.
GI is only one part of the picture and values can vary.
If you enjoy new or baby potatoes, eating them with their skins is one straightforward way to include more fibre.
Keep the skin on when practical
Potato skin provides fibre.
The NHS and Eatwell Guide both encourage keeping potato skins on where practical because this increases the fibre provided by the food.
This works particularly well with new potatoes, baked potatoes and homemade wedges.
Cooking method makes a difference
How potatoes are prepared can change the finished meal substantially.
Boiled potatoes generally require little or no added fat.
Mashed potatoes may contain milk, butter, cream or cheese. Roast potatoes absorb some of the fat they are cooked in, while chips and fries may contain additional fat and salt.
The NHS notes that added fats used when cooking and serving starchy foods increase their calorie content.
This does not mean you need to stop eating roast potatoes or chips. It simply means cooking method is worth considering as well as the potato itself.
Jacket potatoes: look at the whole meal
The British Dietetic Association currently lists jacket potatoes as a higher-GI potato choice.
That number does not describe the entire meal.
A jacket potato with its skin, vegetables or salad and a source of protein such as beans, tuna or cottage cheese is different from eating the potato on its own.
Protein, fat and fibre eaten alongside carbohydrate can affect digestion and absorption, so the whole meal matters as well as the potato.
If jacket potatoes are a regular meal for you, think about the portion and filling rather than judging the potato only by its GI value.
Does cooling potatoes make a difference?
Cooking and then cooling starchy foods can change some of their starch into resistant starch.
The British Dietetic Association notes that cooked-and-cooled potatoes, pasta and rice can have a lower GI than the same foods when freshly cooked and eaten hot.
This is useful to know, but it does not remove the carbohydrate from the food.
Portion size and the rest of the meal remain important.
For more on similar starchy foods, see our guide to pasta and rice for prediabetes.
What about sweet potatoes?
Sweet potatoes can be another useful option and are currently included among the British Dietetic Association’s lower-GI potato choices.
That does not mean they must replace ordinary potatoes.
Ordinary potatoes also provide useful nutrients, particularly when the skin is retained.
If you enjoy sweet potatoes, they can provide variety. If you prefer ordinary potatoes, there is no need to replace every potato on your shopping list.
Frozen potato products: check the label
The frozen aisle contains a wide range of potato products, including frozen jacket potatoes, mash, roast potatoes, chips, wedges and sweet-potato products.
Prepared products can contain added fat, saturated fat and salt, so compare similar products using the nutrition information.
Plain frozen potato products can be quite different from heavily seasoned or pre-fried products.
If you need help comparing packets, see our guide to reading food labels for prediabetes.
What you’ll find in UK supermarkets
Tesco, Sainsbury’s, Asda and Ocado all stock a range of ordinary potatoes as well as frozen and prepared potato products.
Choices typically include new or baby potatoes, baking potatoes, white potatoes, varieties suitable for roasting or mashing, sweet potatoes and frozen potato products.
There is no need for a specialist product because you have prediabetes.
Think about portion size, keep the skin on where practical, consider how the potato has been cooked and look at what you are serving with it.
Those simple points are more useful than treating one type of potato as “good” and another as “bad”.
Retailer ranges checked September 2026: Tesco, Sainsbury’s, Asda and Ocado (fresh and frozen potato ranges).