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Lupin bean

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Lupin beans are small, yellow legume seeds belonging to the genus *Lupinus*. These seeds serve as a versatile food source for humans and animals across the globe. They are often enjoyed as a pickled snack preserved in salty brine. People value them for their high nutritional density and their ability to grow in various climates. While many varieties are used for livestock feed, they are increasingly recognized as a significant plant-based protein. They offer a sustainable alternative to soy because they thrive in temperate to cool environments.

Preparing lupin beans requires specific steps to ensure they are safe and tasty. Most raw lupin seeds contain a thick seed coat made of 25% cellulose. This outer layer is often removed during processing by rubbing the bean between a thumb and forefinger. For many traditional varieties, the most important step is the removal of bitter alkaloids. These are natural compounds that can cause illness if not managed. To remove them, the beans must undergo a process called leaching. This involves soaking the seeds in salted water for several days to wash away the bitterness.

Lupins are categorized into two main types: bitter and sweet. Bitter lupins, such as *Lupinus albus* or *Lupinus mutabilis*, contain high levels of alkaloids. These varieties require methodical rinsing or soaking to become edible. In contrast, sweet lupins are low-alkaloid cultivars that have been specially bred. The Australian Sweet Lupin (*L. angustifolius*) is a notable example. These sweet varieties do not require soaking in a salt solution because they lack the bitter taste. This makes them much easier for modern food production.

The history of the lupin spans thousands of years and many continents. The most ancient evidence comes from Egypt, dating back to the 22nd century BC. Archaeologists discovered seeds of *Lupinus digitatus* in the tombs of the Twelfth Dynasty of Pharaohs. In the Americas, the *Lupinus mutabilis* variety was domesticated by pre-Incan inhabitants in present-day Peru. Rock imprints of lupin seeds and leaves from the 6th or 7th century BC are kept in the National Museum of Lima. The plant was also a widespread food during the Incan Empire and was used by the Yavapai people in North America.

Lupins are nutritionally dense, containing 36% protein and 40% carbohydrates. They are also a moderate-to-rich source of B vitamins, providing 89% of the Daily Value for folate. Additionally, they supply 113% of the Daily Value for the mineral manganese. These seeds are used in many ways, such as lupin flour or lupin-tofu. In Ecuador, they are served as a street food called "cevichochos." As of 2020, only 4% of all lupins were consumed by humans, while the majority served as stock feed. However, they are growing in popularity as a high-protein additive for vegan meat and dairy substitutes.

Safety is a major concern when handling bitter lupin varieties. If bitter beans are not prepared correctly, the remaining alkaloids can cause a nervous syndrome. Symptoms of poisoning include confusion, tremors, high heart rate, and difficulty speaking. In Australia, farmers maintain wide quarantine zones around crops to prevent cross-pollination. This protects sweet crops from wild, bitter pollen that could make them toxic. Furthermore, some people may suffer from a lupin allergy, which can cause life-threatening anaphylaxis. Because of this, the EU requires lupin to be listed as an allergen on food labels.

Beyond human nutrition, lupins play a role in larger agricultural systems. They are widely cultivated in Australia, Europe, Russia, and the Americas. Farmers use them as green manure to improve soil or as grazing plants for livestock. Three Mediterranean species, including the blue, white, and yellow lupin, are commonly used for poultry and livestock feed. However, producers must be careful, as bitter lupins in animal feed can cause poisoning. As the world looks for more plant-based proteins, the lupin remains a vital crop for both food and farming.

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