Cyanobacteria: residing in our gut appear to help generate B and K vitamins that we depend upon for nutrition. Although it was originally believed that the cyanobacteria in our gut originate from the chloroplasts in plants we eat, research indicates that our gut cyanobacteria are different strains that evolved to specifically inhabit our digestive tracts and help us ferment sugars we digest into acids and alcohols. Despite being commonly known as blue-green algae, cyanobacteria are in fact ancient bacteria that arose over three billion years ago. More than two billion years ago, cyanobacteria living alongside early forms of plant-life were actuallyabsorbed by plant cells and became what we now know as chloroplasts (Source Ubiome).

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