The 25 Worst Keto Products That Aren’t Really Keto
The ketogenic diet requires strict carbohydrate restriction to maintain nutritional ketosis. Yet UK supermarkets increasingly stock products labelled ‘keto’ that contain ingredients likely to disrupt fat adaptation. These items often rely on maltitol, tapioca starch, or excessive protein isolates that trigger insulin responses.
Why packaging claims deceive
EU labelling laws permit ‘low carb’ claims for products under 10g net carbs per 100g. But many use sweeteners like maltitol (45% glycemic index) or fillers like potato starch. A 2023 Which? investigation found 12 ‘keto’ bars at Tesco and Sainsbury’s with over 5g net carbs per serving – enough to stall ketosis for some.
The offenders list
1. ‘Keto’ granola (4.50 at Waitrose) – Contains tapioca fibre and rice protein concentrate (3.5g net carbs per 30g serving) 2. High-protein crispbreads – Often use wheat gluten and pea protein (6g net carbs per cracker) 3. Sugar-free chocolate bars – Maltitol syrup spikes blood glucose similarly to sugar
common keto electrolyte mistakes
What this means in practice
A £3.99 ‘keto’ snack bar at Boots might contain 8g maltitol and 2g tapioca starch – nearly half the daily 20g carb limit. Seasonal ‘keto’ Christmas puddings at M&S (2023 edition) had 9g net carbs per 60g serving due to dried fruit concentrates. The NHS advises people with type 2 diabetes to scrutinise labels for these hidden sugars.
How to identify genuine keto foods
Look for:
- No maltitol or sorbitol (erythritol and stevia are safer)
- Under 2g net carbs per serving
- Primary fats like coconut oil or olive oil
Frequently asked questions
Are supermarket ‘keto’ sections trustworthy?
Most UK supermarkets now have keto-labelled sections, but only about 30% of products meet strict ketogenic macros. Always check the nutrition panel rather than front-of-pack claims.
Why do protein bars stall weight loss?
Many high-protein bars contain whey isolate that triggers insulin nearly as much as carbohydrates. This can interrupt fat-burning even if carb counts appear low.
Which sweeteners are truly keto-friendly?
Erythritol, monk fruit and stevia have negligible glycemic impact. Maltitol and isomalt should be avoided despite being sugar-free.
The bottom line
Between misleading labels and clever marketing, navigating keto products requires vigilance. Stick to whole foods where possible, and when buying packaged items, scrutinise every ingredient. 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
- Bueno NB, de Melo IS, de Oliveira SL, da Rocha Ataide T (2013). Very-low-carbohydrate ketogenic diet v. low-fat diet for long-term weight loss: a meta-analysis of randomised controlled trials. British Journal of Nutrition. https://doi.org/10.1017/S0007114513000548
- 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
