The word “keto” on a package is now worth money. It lets a manufacturer charge a premium for a bar, a cookie or a loaf, and the shelves of every supermarket and health shop are filling up with products wearing it. Some of what is behind that label is genuinely fine. A lot of it is ordinary food with a markup. And a few of them quietly do the opposite of what they promise. This is a guide to telling the three apart, because the label on the front is the least reliable thing in the whole transaction.
Category one: real food that was always keto, now with a sticker
A good portion of the “keto” aisle is food that has always been low in carbohydrate, repackaged with the magic word and a higher price. Pork scratchings. Nuts and nut butters. Cheese. Tinned fish. Olives. Dark chocolate at 85 or 90 per cent. Biltong and good charcuterie. None of this needed a keto label to be keto, and none of it needs to come from the special section at the special price.
There is nothing wrong with eating any of it. The only mistake is paying extra for the branded version when the identical thing sits cheaper a few aisles over, labelled as what it is. A bag of almonds is a bag of almonds. If the keto branding has added anything beyond cost, it is usually a smaller pack and a glossier wrapper. Buy the ordinary version and keep the difference.
Category two: engineered “keto” versions of carby foods
This is where the trouble lives. Keto bars, keto cookies, keto bread, low-carb tortillas, keto ice cream, keto granola: foods that are normally built on flour, sugar or starch, reengineered to hit a low carbohydrate number on the label. The reengineering is exactly where the claims get slippery, and there are two specific places to look.
The net-carb arithmetic. These products lead with a “net carbs” figure, which is the total carbohydrate minus the parts assumed not to raise blood sugar, namely fibre and sugar alcohols. The logic is reasonable in principle and is covered in the net carbs article. The problem is that the subtraction is only honest if the things being subtracted really are inert, and sometimes they are not. A bar can show “3g net carbs” on the front while containing far more total carbohydrate, with the gap explained away by fibres and polyols that, on closer inspection, are not as free as the maths pretends. In the European Union the nutrition panel already separates these out: the declared carbohydrate excludes fibre, and any polyols are listed on their own line, so the back of the pack usually tells you more than the front.
The sweeteners and fibres used. This is the detail that decides whether a product is fine or a problem, and it is covered in full in the sweeteners article. The short version matters here. Erythritol and allulose are very close to inert: little or no effect on blood sugar, and they pass through largely unchanged. A bar sweetened with those, or with stevia, has a net-carb number you can roughly trust. Maltitol is a different animal. It has a glycaemic index around 35, not far below table sugar, because roughly half of it is absorbed in the small intestine and broken down to glucose, so it does raise blood sugar. The rest ferments in the large intestine, which produces gas and, at modest doses above twenty to thirty grams, a reliable laxative effect. Several countries require a warning to that effect on products containing much of it. Some bars also use fibre syrups, such as certain isomalto-oligosaccharides, that are marketed as fibre but digest to glucose more readily than the label implies.
The practical upshot is that two bars can both claim “3g net carbs” and behave completely differently in your body. One sweetened with erythritol may genuinely do little. One built on maltitol may spike your blood sugar and send you looking for a toilet. The front of the pack does not distinguish them. The ingredient list does.
Category three: the genuinely useful few
A small number of products earn their place. An electrolyte powder, if you are in the first weeks of keto or training hard and struggling with cramps and flatness, is a reasonable convenience, though salted water and food do the same job for less. A low-carb staple you have actually checked and genuinely enjoy, a particular bread or wrap that uses sound ingredients and that makes sticking to the diet easier, can be worth it for the adherence alone, because a diet you keep to beats a purer one you abandon. The test is not whether it has a keto label but whether it survives the ingredient list and whether it adds something real food cannot.
How to read the label in twenty seconds
Ignore the front entirely. Turn the pack over and do three things. Read the ingredient list and see what the product is actually made of; real ingredients in plain language are a good sign, a long list of engineered ones less so. Find the “of which polyols” line and the named sweetener: erythritol, allulose or stevia is reassuring, maltitol is a red flag, and an isomalto-oligosaccharide or “IMO” syrup is worth suspicion. Then ask the simple question of whether this is a real food that happens to be low-carb, or a manufactured imitation of a high-carb food. The first kind rarely lets you down. The second kind needs to earn your trust line by line. If you own a glucose meter and you care about a particular product, the final word is to eat it and measure your own response an hour later, which tells you more than any package ever will.
The honest bottom line
Most of the “keto” aisle is unnecessary. The products you genuinely cannot do without are few, and the ones most heavily marketed, the bars and cookies and sweet treats engineered to taste like the foods you are avoiding, are exactly the ones most likely to be either overpriced real food or quietly carb-laden through their sweeteners. The cheapest, most reliable keto shopping is the food that never needed the label: meat, fish, eggs, cheese, nuts, olives, vegetables and very dark chocolate. Treat the engineered products as occasional conveniences to be checked rather than staples to be trusted, read the back of the pack rather than the front, and you will spend less, eat better, and avoid the small daily sabotage of a bar that was never as low-carb as it claimed.
This is general information about the ketogenic diet, not medical or dietary advice. Individual responses to sweeteners and sugar alcohols vary. If you have diabetes, digestive conditions, or take medication, seek advice tailored to you before relying on any particular product.
Sources: Digestive tolerance and postprandial glycaemic and insulinaemic responses after consumption of dairy desserts containing maltitol and fructo-oligosaccharides in adults. European Journal of Clinical Nutrition. 2013. Read it here. EU Regulation 1169/2011 on the provision of food information to consumers (nutrition declaration, including polyols). Read it here.