Canned kidney beans are generally already processed to make them safe for normal consumption.
The FDA specifically recognizes phytohaemagglutinin in inadequately cooked beans as a potential natural food toxin.
FDA
Wild and unfamiliar plants
Another concern arises when people gather vegetables, mushrooms, roots, or herbs from unfamiliar environments.
Some poisonous plants resemble edible species.
Even experienced foragers can make identification mistakes.
For this reason, wild plants should never be consumed unless their identity and appropriate preparation are reliably established.
These examples demonstrate why it is important to understand the characteristics of individual foods rather than assuming that every plant ingredient can be eaten raw or prepared in the same way.
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- The Truth About Nitrates in Leafy Vegetables
Leafy vegetables such as spinach, lettuce, and certain varieties of cabbage naturally contain nitrates.
Nitrates are also found in foods such as beetroot and celery.
