That’s a mistake, because too much of anything can be harmful.
Virtually all plants contain some chemicals that make us healthy and some chemicals that can harm us. Fortunately for us, our ancestors picked out plants that contain more good chemicals and therefore are healthful, and taught us to avoid those that are poisonous. However, if you eat large amounts of one food, you can poison yourself, even though reasonable amounts are harmless or beneficial.
Soybeans are a good example. Soybeans contain genistein, a weak estrogen that may help to prevent breast cancer. They contain omega-3 fatty acids that help prevent heart attacks, and are loaded with fiber that helps to prevent diabetes.
But soybeans contain trypsin inhibitors that block protein consumption and hemagglutinin that causes clots to form.
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