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{"id":13735,"date":"2026-08-30T18:09:14","date_gmt":"2026-08-30T16:09:14","guid":{"rendered":"https:\/\/www.elmercadodeorigen.com\/se-pierden-nutrientes-cocer-legumbres\/"},"modified":"2026-08-30T18:09:14","modified_gmt":"2026-08-30T16:09:14","slug":"se-pierden-nutrientes-cocer-legumbres","status":"publish","type":"post","link":"https:\/\/www.elmercadodeorigen.com\/en\/do-legumes-lose-nutrients-when-cooked\/","title":{"rendered":"Do legumes lose nutrients when cooked?"},"content":{"rendered":"

Yes, cooking can reduce some nutrients in pulses, but a simple ‘yes’ gives an incomplete picture. Cooking also makes many pulses safe and pleasant to eat, softens their texture, gelatinises starch, modifies proteins and lowers several antinutritional factors.<\/p>\n

The useful question is not whether anything changes\u2014it does\u2014but which nutrients are sensitive, which are retained, and what benefits cooking provides in return<\/strong>.<\/p>\n

Protein does not disappear when boiled<\/h2>\n

Heat denatures proteins, changing their three-dimensional structure. This is a normal part of cooking and does not mean the protein loses all nutritional value. Thermal treatment also inactivates protease inhibitors and heat-labile lectins that can impair digestion or cause problems when some pulses are undercooked.<\/p>\n

Protein per 100 g falls markedly from dry to cooked, but most of this difference is water dilution. True losses are better assessed across the whole batch or on a dry-matter basis.<\/p>\n

B vitamins are more sensitive<\/h2>\n

Water-soluble vitamins can leach into cooking water and some are sensitive to prolonged heating. Thiamine and folate are relevant examples. Longer cooking and discarding larger volumes of water can increase losses of certain vitamins.<\/p>\n

That does not mean cooked pulses contain no vitamins. The size of the change varies greatly by species and cooking method.<\/p>\n

Minerals survive heat but can move into water<\/h2>\n

Iron, magnesium, potassium, phosphorus and zinc are not destroyed simply by reaching boiling temperature. Some can, however, leach into cooking water. If the liquid remains in the dish, some of those minerals are still consumed; if it is drained away, that fraction is lost.<\/p>\n

Fibre and starch change structure<\/h2>\n

Cooking softens cell walls and changes fibre structure. It also gelatinises starch, making it more accessible to digestive enzymes. After cooling, some starch can retrograde and behave as resistant starch.<\/p>\n

These changes help explain why cooked pulses have a different texture and digestive behaviour while still remaining rich in fibre and complex carbohydrates.<\/p>\n

Polyphenols and other bioactive compounds<\/h2>\n

Thermal processing can reduce some phenolics and laboratory measures of antioxidant capacity, particularly when compounds degrade or leach into water. A recent review of processing methods<\/a> reports highly variable changes depending on pulse and treatment.<\/p>\n

The important point is that processing is not one-way: some compounds fall, others transform, while digestibility and availability of certain nutrients can improve.<\/p>\n

What cooking reduces\u2014and why that can be useful<\/h2>\n

Pulses naturally contain phytates, tannins, trypsin inhibitors, lectins and oligosaccharides in amounts that differ by species. Many are reduced by soaking and heat. Lectins in certain beans are one reason adequate cooking is a food-safety requirement rather than an optional nutritional choice.<\/p>\n

Reviews of antinutritional factors in legumes<\/a> show cooking is particularly effective against heat-labile factors and that soaking plus cooking can be more effective than heat alone.<\/p>\n

Pressure cooker or conventional cooking?<\/h2>\n

Pressure cooking reaches higher temperatures but dramatically shortens total cooking time. A more intense yet shorter treatment can retain some nutrients better than prolonged simmering, although results depend on the pulse and nutrient.<\/p>\n

There is no universal rule that pressure cooking ‘destroys more vitamins’. Avoiding unnecessary overcooking is a more useful household principle.<\/p>\n

How to limit unnecessary losses<\/h2>\n