Lupins contain toxic substances, which can, however, be rendered harmless through proper processing. Here you can find out what you should pay attention to when it comes to lupins in food.
Lupins are a type of plant that originally comes from Mexico, but grows in many gardens here. The name “lupine” comes from the Latin term for “wolf”, which is why we also know it as the wolf bean. They belong to the legume family, just like chickpeas and peanuts.
Lupins are also known as “local soy” because they can be processed into vegan milk and coffee in a similar way to soybeans. But the lupins, some of which are poisonous, also have properties that make them potentially dangerous. You can find out everything you need to know about lupins in our guide.
Lupins and their ingredients
Lupins are very nutritious and are even used as a meat substitute. They contain, among other things:
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Proteins (36 grams per 100 grams, about the same as soybeans)
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Fiber (19 grams per 100 grams)
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Vitamin A and Vitamin B1
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Minerals such as calcium, potassium, iron and magnesium
Another advantage: You can use the lupins to make lupine flour, which is completely gluten-free.
However, the legumes are not entirely harmless: depending on the variety, lupins can contain various poisons. In the following paragraphs we will explain to you what you should pay attention to when buying lupine products and why the seeds of typical garden lupins are not edible.
Which lupins are poisonous?
The seeds of the blue sweet lupins are mainly used for food processing. They are a cultivated variant of the plant that, unlike wild lupins, no longer contains any toxic bitter substances. These so-called alkaloids often lead to skeletal deformation in animals such as sheep, cattle or horses.
In humans, the toxic alkaloids from lupine can cause the following symptoms:
- General restlessness, paleness, sweating, tremors and vomiting.
- In a statement from 2025, the Federal Office for Risk Assessment (BfR) also named pupil dilation, dizziness, dry mouth, stomach pain and diarrhea as symptoms of moderate poisoning.
- More serious effects at higher doses include cardiac arrhythmias as well as convulsions and paralysis, which in the worst case can lead to respiratory arrest.
In addition, de-bittered lupins also contain other harmful toxins such as lectins. Lectins are protein compounds present in most legumes. They cause red blood cells to clump together, which impairs the transport of oxygen in the body.
However, according to Quarks, lectins can be destroyed by soaking, cooking and further processing. Lupins are poisonous raw, but you can eat them when cooked.
Poisonous lupine: What you should pay attention to when buying
When buying lupine products, you should definitely make sure that they only contain “sweet lupins” or “de-bittered bitter lupine seeds”.
Between 2010 and 2016, 30 cases of lupine poisoning of varying degrees of severity were reported to the Federal Office for Risk Assessment (BfR). According to the BfR’s statement from 2025, lupine seeds only pose a risk of poisoning in exceptional cases. However, due to the often unspecific symptoms, the number of unreported cases is probably higher than the number of cases actually reported.
Especially when buying unprocessed seeds, it is usually not clear where they come from or what type they are. In addition, the risk of poisoning is even higher with them than with foods that have already been processed. You should therefore avoid unprocessed lupins from unclear origins.
Note: Another concern of the BfR is that lupins can trigger allergic reactions. In particular, cross-allergies occur with other legumes such as soybeans or peanuts. Therefore, you should stay away from lupins if you are allergic to certain legumes.
Revised by Philipp Multhaupt
Read more on Techzle\.com:
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