It's a processed but healthy product, as it's made from fish, olive oil, and salt. Therefore, it's a recommended product for any diet, including a ketogenic diet, as its carbohydrate content is only 0.7 grams per 100 grams.

Hacendado extra virgin olive oil is a processed food, but in this case, it's healthy, thanks to its high content of so-called good fats. It's also ideal for people following a low-carb diet, as it's completely free of them.

Natural light tuna is a healthy product, as it contains light tuna, water, and salt. Therefore, it's a recommended product for everyday use, but also good for those following the ketogenic diet, as its carbohydrate content is very low: less than 0.5 grams per 100 grams of product.

The Trevélez ham from Antonio Alvárez sold at Mercado is, like all ham, a processed meat, a food classified by the WHO as carcinogenic, so its inclusion in the regular diet is not recommended, but it is also not dangerous to eat occasionally. If you follow a low-carb or ketogenic diet, it is an ideal food: its carbohydrate content per 100 grams of product is 0.8 grams. 

Hermanos Martínez's fresh sausage without casing is a sausage made of 80% pork, but it also includes several other ingredients, so it could be considered ultra-processed. Although this characteristic doesn't make it highly recommended for everyday use, things change if you follow the ketogenic diet, as its carbohydrate content is very low, specifically 1 gram, 0.5 of which corresponds to sugars.

Nat Sanno extra virgin coconut oil can be consumed directly as a dressing or used for baking, roasting, or frying. Although it is a highly recommended food worldwide, fitness , it's a processed and refined food, so its regular use isn't recommended. However, its carbohydrate content is 0 grams, so it's suitable for the ketogenic diet.

Aioli is a high-calorie sauce, and packaged, rather than homemade, aioli is also an ultra-processed food. But again, in terms of carbohydrate content, it's suitable for the ketogenic diet, as it has 1.4 grams per 100g of product. 

Sausage

It is part of the Spanish superfoods . I recommend the 600g lump. It's a good value for money and it's delicious. It has perfect macros: 33% fat and 22% protein.

Turkey ragout

It has 18% protein and 6% fat. Very tasty.

Torreznos

Pork rinds. They have so much protein (up to 70%). Mercadona only uses pork fat, with 56.3% protein and 46.1% fat.

Unsalted butter

Remember that butter is much better than margarine.

Free-range eggs

At Mercadona, you can find delicious eggs. They come in packs of 6. They're a little more expensive than the "regular" ones, but there's a big difference in quality and flavor. If you want to start buying organic products, you can start with the eggs!

Sardines

Cooking ones, which are cheaper. Alternatively, cans of sardines in "low-salt" olive oil (light blue boxes).