The 10 Cheapest Keto Foods in UK Supermarkets
The ketogenic diet doesn’t have to break the bank. With careful planning, you can find affordable staples in every UK supermarket that fit within a low-carb, high-fat framework. The key is focusing on whole foods with minimal processing – these tend to be both cheaper and more nutritious.
Eggs
At around £1.50 for 15 large free-range eggs at Tesco, eggs are one of the most cost-effective protein sources. They contain all nine essential amino acids and keep you full for hours. Research shows eggs increase satiety hormones more than carb-heavy breakfasts (Sumithran et al., 2013). Scramble them with butter, boil for snacks, or bake into crustless quiches.
Chicken Thighs
Skin-on, bone-in chicken thighs cost approximately £2.50/kg at Aldi – half the price of breasts. The higher fat content makes them ideal for keto. Roast a batch with salt and paprika for easy meals throughout the week. The skin crisps beautifully when air-fried.
Cabbage
White cabbage sells for about 60p per head in most UK supermarkets. It’s versatile raw in salads, fermented into sauerkraut, or sautéed with bacon fat. Cabbage provides fibre and vitamin K with just 3g net carbs per 100g. keto-friendly vegetables like this help balance meals economically.
Mince (Beef or Pork)
Standard 20% fat beef mince hovers around £4/kg at Sainsbury’s. Higher fat percentages cost less and suit keto better. Brown it with onions and spices for chilli, or mix with egg to make meatballs. Pork mince often costs even less and works well in Asian-inspired dishes.
Frozen Cauliflower
At £1 for 500g in Lidl, frozen cauliflower outperforms fresh on price year-round. It steams quickly for mash or rices in a food processor as a carb substitute. Cauliflower contains antioxidants called glucosinolates that may support cellular health (Hyde et al., 2019).
What This Means in Practice
Autumn is an ideal time to stock up on seasonal UK produce like Brussels sprouts (75p/250g at Morrisons) and squash. Pair these with cheap proteins for balanced meals under £2 per portion. The NHS advises that low-carb diets can be nutritionally complete when including varied vegetables and quality fats.
Tinned Mackerel
Wild-caught mackerel fillets in olive oil cost roughly £1 per tin at Asda. They provide omega-3s and require no cooking – just drain and flake over salad. Tinned fish keeps for months, making it perfect for pantry meals when fresh options run low.
Full-Fat Greek Yoghurt
A 500g tub of store-brand Greek yoghurt (5% fat) costs about £1.20 at Waitrose. It has half the carbs of regular yoghurt and pairs well with nuts or berries. The probiotics support gut health, which emerging research links to metabolic benefits.
Pork Scratchings
At £1.50 for a 90g bag in most petrol stations and supermarkets, pork scratchings offer a crunchy, zero-carb snack. Check labels for additives, but basic versions contain just pork and salt. They’re portable protein for when hunger strikes between meals.
Butter
British butter averages £1.30 per 250g block. It’s one of the cheapest sources of quality fat for cooking and baking. Grass-fed varieties cost slightly more but provide more conjugated linoleic acid (CLA), associated with metabolic health in some studies.
Frequently Asked Questions
Can I do keto on £30 a week?
Yes, by focusing on eggs, mince, frozen vegetables and cheaper cuts of meat. Batch cooking reduces costs further. A dozen eggs, 1kg chicken thighs, 500g mince and seasonal veg cover several meals economically.
Are supermarket own-brands keto-friendly?
Mostly yes – check nutrition labels for hidden carbs in processed items. Basics ranges often have simpler ingredients than premium brands. For example, Aldi’s everyday butter contains just cream and salt.
Which supermarkets are best for keto bargains?
Aldi and Lidl consistently offer the lowest prices on staples like eggs, meat and frozen veg. Tesco and Sainsbury’s have good deals on rotation. M&S and Waitrose cost more but stock specialty items like extra-thick double cream.
The Bottom Line
Eating keto in the UK needn’t be expensive. By prioritising whole foods like eggs, cabbage and mince, you can keep grocery bills low while meeting macronutrient targets. Seasonal buying and smart supermarket choices make the diet sustainable long-term. If you’d rather not do the macro maths yourself, the Keto Dieting app does it for you on Google Play and the App Store.
References
- Sumithran P, Prendergast LA, Delbridge E, et al. (2013). Ketosis and appetite-mediating nutrients and hormones after weight loss. European Journal of Clinical Nutrition. https://doi.org/10.1038/ejcn.2013.90
- Hyde PN, Sapper TN, Crabtree CD, et al. (2019). Dietary carbohydrate restriction improves metabolic syndrome independent of weight loss. JCI Insight. https://doi.org/10.1172/jci.insight.128308
