If you’re planning a Sunday roast, you may be wondering: are roast potatoes cooked in oil high in syns on Slimming World? Traditional roasties taste amazing when cooked in fat, but the added oil can quickly push up your daily syn allowance.
In this guide, we’ll break down the syn values of roast potatoes cooked in oil, compare popular supermarket and frozen options, and share our best recipe for low-syn Slimming World roast potatoes.
Yes – roast potatoes cooked in oil are considered high in syns. A typical 100g portion has 5–10 syns depending on the type of oil or fat used. This is because potatoes themselves are syn-free, but the added fat from sunflower oil, goose fat, or beef dripping increases the syn value.
For example:
That’s a big chunk of your daily syn allowance gone on just one side dish.
The problem isn’t the potatoes – it’s the fat. Cooking in oil or animal fat adds 3–5g of fat per serving, depending on how much is absorbed. Since Slimming World calculates syns based on calories from fat, these extra oils significantly raise the total syn value.
👉 Slimming World tip: To save syns, swap oil for a low-calorie cooking spray (such as Frylight) or use stock to parboil before roasting. This way you still get crispy, golden roasties without spending unnecessary syns.
Here’s a quick reference list of syn values for popular supermarket and frozen roast potatoes. Values are approximate and based on average serving sizes.
Here’s a healthier, syn-friendly way to make roasties at home:
✅ You’ll end up with crispy, fluffy roasties – completely syn-free if only spray oil is used.
Roast potatoes cooked in oil may taste indulgent, but at 5–10 syns per 100g, they’re not the best choice if you’re following Slimming World. Thankfully, making your own low-syn roasties at home with spray oil is simple, budget-friendly, and guilt-free.
If you’re eating out or buying frozen versions, always check the packaging or Slimming World app for the most accurate syn values.
👉 Want to keep your Sunday roast slimming-friendly? Swap roasties for syn-free Slimming World roast potatoes – you’ll save syns for dessert instead!
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