The food certification thread you've been waiting for
A complete guide to food certifications: eggs, meat, fish and dairy. Codes, labels and warnings about nitrites and legally permitted fraud.
English · Original discussion in Spanish · Published
Food certifications: the definitive guide to not being fooled at the supermarket
The acceptable daily intake of nitrites is 0.07 mg per kilo of body weight. For a 70 kg adult, that's 4.9 mg a day. A single slice of serrano ham can exceed that limit. Between European labels, protected designations of origin and legally permitted fraud, consumers need a map to navigate the jungle of food labels.
Eggs: the code that tells you everything
The first digit of the code printed on the egg reveals the hens' living conditions: 0 organic, 1 free-range, 2 barn-raised, 3 caged. Industrial laying hens produce up to 300 eggs a year, regardless of shell colour. During the avian flu lockdown (November 2025 to April 2026), the law allowed eggs from hens with no outdoor access to be sold as free-range, a legal fraud to compensate for the culls.
Meat: from intensive farming to ibérico
With fresh pork, the key difference lies in the breed and how the animals are raised. Intensive white pig farms can house up to 5,500 animals in enclosed facilities with 0.65 m² per 100 kg pig. Pata zaina ibérico ham is governed by protected designations of origin. In charcuterie, serrano ham carries the TSG (Traditional Speciality Guaranteed) label, which requires a minimum curing time of 7 months — but beware: all cured meats contain nitrites (E-249, E-250) and nitrates (E-251, E-252), additives that form carcinogenic nitrosamines in the body.
Fish: heavy metals and the MSC label
EU Regulation 2023/915 sets maximum levels for mercury, cadmium and lead. Labs strongly advise against eating swordfish, sharks (tope, blue shark), bluefin tuna and pike altogether because of their extremely high mercury content. Cadmium accumulates in the heads of prawns and langoustines. The MSC label certifies sustainable fishing, but does not monitor contaminants.
Dairy and cheese: beyond the brand
Certified farm milk (TSG) guarantees that milking, pasteurisation and packaging all take place on the same farm. Pasture-raised milk is not the same thing. With cheese, watch out for dairy preparations and processed cheeses containing starches and vegetable fats: they are not cheese. Ricotta-style whey cheese isn't either.
The hidden danger of nitrites
The additives E-249, E-250, E-251 and E-252 are potentially carcinogenic. The acceptable daily intake (ADI) is 0.07 mg/kg of body weight. For a 70 kg adult, that's 4.9 mg a day. A single serving of charcuterie can easily exceed it. The medical recommendation: avoid cured meat products, especially for children.
Caught between official labels and legally permitted fraud, consumers need to arm themselves with information. The law does not always offer protection, as the poultry lockdown that allowed free-range eggs to be sold from hens kept indoors clearly shows. In the end, the responsibility falls on whoever reads the label.
Related discussions on the forum
The acceptable daily intake of nitrites is 0.07 mg per kilo of body weight. For a 70 kg adult, that's 4.9 mg a day. A single slice of serrano ham can exceed that limit. Between European labels, protected designations of origin and legally permitted fraud, consumers need a map to navigate the jungle of food labels.
Eggs: the code that tells you everything
The first digit of the code printed on the egg reveals the hens' living conditions: 0 organic, 1 free-range, 2 barn-raised, 3 caged. Industrial laying hens produce up to 300 eggs a year, regardless of shell colour. During the avian flu lockdown (November 2025 to April 2026), the law allowed eggs from hens with no outdoor access to be sold as free-range, a legal fraud to compensate for the culls.
Meat: from intensive farming to ibérico
With fresh pork, the key difference lies in the breed and how the animals are raised. Intensive white pig farms can house up to 5,500 animals in enclosed facilities with 0.65 m² per 100 kg pig. Pata zaina ibérico ham is governed by protected designations of origin. In charcuterie, serrano ham carries the TSG (Traditional Speciality Guaranteed) label, which requires a minimum curing time of 7 months — but beware: all cured meats contain nitrites (E-249, E-250) and nitrates (E-251, E-252), additives that form carcinogenic nitrosamines in the body.
Fish: heavy metals and the MSC label
EU Regulation 2023/915 sets maximum levels for mercury, cadmium and lead. Labs strongly advise against eating swordfish, sharks (tope, blue shark), bluefin tuna and pike altogether because of their extremely high mercury content. Cadmium accumulates in the heads of prawns and langoustines. The MSC label certifies sustainable fishing, but does not monitor contaminants.
Dairy and cheese: beyond the brand
Certified farm milk (TSG) guarantees that milking, pasteurisation and packaging all take place on the same farm. Pasture-raised milk is not the same thing. With cheese, watch out for dairy preparations and processed cheeses containing starches and vegetable fats: they are not cheese. Ricotta-style whey cheese isn't either.
The hidden danger of nitrites
The additives E-249, E-250, E-251 and E-252 are potentially carcinogenic. The acceptable daily intake (ADI) is 0.07 mg/kg of body weight. For a 70 kg adult, that's 4.9 mg a day. A single serving of charcuterie can easily exceed it. The medical recommendation: avoid cured meat products, especially for children.
Caught between official labels and legally permitted fraud, consumers need to arm themselves with information. The law does not always offer protection, as the poultry lockdown that allowed free-range eggs to be sold from hens kept indoors clearly shows. In the end, the responsibility falls on whoever reads the label.
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Summary of a discussion on Burbuja.info - Foro de economía, actualidad y política., translated from Spanish and reviewed before publication. Read the full discussion (26 replies).
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