E161g (canthaxanthin)

E161g is canthaxanthin, an orange-red carotenoid colour. It is known both as a food colour and from use in animal feed, where it can intensify the colour of egg yolks, skin or fish flesh. In foods, canthaxanthin is used mainly for shade: warm orange, reddish-orange or a more saturated colour that the product would not otherwise have.

Canthaxanthin belongs to the carotenoid family, but that does not mean it should automatically be equated with carrots, pumpkin, greens or tomatoes. In whole foods, pigments come with a food matrix, fibre, fats, minerals and many accompanying compounds. In an industrial product, E161g may be an isolated colourant that creates a visual effect without making the food vegetable-rich or nutrient-dense.

Why canthaxanthin needs caution

Canthaxanthin has a particular safety history because high doses formerly used not as ordinary food colour but to change skin colour were associated with crystalline deposits in the retina. This is not the same as occasional trace amounts of E161g in food, but it shows why carotenoid pigments should not be considered automatically beneficial at any dose and in any form.

EFSA has assessed canthaxanthin with attention to acceptable daily intake and toxicological data. The practical point is that a rare technological dose in a food and self-administered high amounts of a pigment are different situations. If a product with E161g is eaten occasionally, the whole ingredient list usually matters more. If a person also takes carotenoid supplements or frequently consumes many coloured foods, total exposure becomes more relevant.

Low-carbohydrate relevance

E161g itself is not sugar, starch or an energy source. Orange-red products, however, may be compatible with LCHF or completely unsuitable. The colour may appear in a sauce, prepared food, drink, dessert or mix. For a low-carbohydrate diet, sugar, syrups, starch, flour, maltodextrin, fruit concentrates, protein and serving size are the deciding factors.

Orange-red colour often strengthens expectations of fruit, meatiness, egg richness or vitamin value. A product may therefore seem more nourishing than it really is. If the ingredient list has little protein, much sweetness or starchy fillers, E161g does not improve the nutritional role of the food. It only makes the appearance more convincing.

Difference from food carotenoid sources

When carotenoids come from eggs, fish, vegetables, greens, tomato products or natural fats, they arrive in food context. That context influences absorption, satiety and accompanying nutrients. Canthaxanthin as a colourant does not provide that picture. It may be part of a product, but it should not replace real sources of carotenoids and fat-soluble vitamins.

If someone cares about vision, skin, mucous membranes or antioxidant protection, the whole diet needs assessment: protein, retinol, zinc, omega-3, fats for absorption, greens, eggs and fish. One coloured ingredient in an industrial food does not solve these questions. This is especially important with supplements, where doses can be far higher than food-colour exposure.

How to read the label

On labels, E161g may appear as canthaxanthin. If it is near the end of the list in a product eaten rarely and not based on sugar, it is usually not the main issue. If it appears with sweet bases, flavourings, starch, syrups or a liquid product that is easy to consume in large portions, the assessment should be stricter.

Canthaxanthin does not need to be demonised, but its carotenoid name should not be used as a sign of benefit. A good diet is recognised by clear foods, protein, natural fats, minerals, vegetables and reliable satiety, not by a bright shade. E161g can be a technological detail, but not the basis of choice.

Canthaxanthin also shows why a carotenoid colourant is not the same as a useful serving of vegetables, fish or eggs. Colour can be technologically adjusted, while nutritional value depends on protein, fats, minerals, vitamins and the degree of processing. In a low-carb diet this distinction matters: a bright orange-red shade does not make a sweet drink, dessert or processed snack more suitable when the rest of the formula is poor.