Cyanobacteria, commonly known as blue-green algae, play an essential role in our own and our planet’s health. As nature’s original superheroes, they are responsible for producing a significant amount of our daily oxygen. However, like every superhero, there’s a “dark side” to cyanobacteria. Some varieties produce toxins known as BMAA, which, in high concentrations, are associated with a higher risk of getting Amyotrophic lateral sclerosis (ALS). Despite this, through an understanding of their role in the diet and some simple strategies, we can reduce ALS risk associated with cyanobacteria.
Knowing Cyanobacteria

Cyanobacteria are one of the oldest known life forms. They are capable of photosynthesis, converting sunlight, water, and carbon dioxide into oxygen and nutrient-rich biomass. As such, they form an integral part of the food chain, feeding everything from microorganisms to whales. However, not all cyanobacteria are beneficial. Some forms produce harmful toxins like BMAA. Consuming these in large amounts can lead to severe neurodegenerative diseases like ALS.
Understanding ALS
Amyotrophic lateral sclerosis, often referred to as “Lou Gehrig’s disease,” is a progressive neurodegenerative disease affects nerve cells in the brain and the spinal cord. It is a terminal illness, often leading to paralysis and death within 3-5 years of diagnosis. While the root cause of ALS is not fully understood, research has indicated a connection between elevated BMAA exposure and an increased ALS risk.
Cyanobacteria Diet and ALS Risk
While avoiding cyanobacteria entirely would seem an easy solution, it is not exactly practical given their omnipresence in nature. They are found in diverse habitats from oceans to freshwater bodies to desert soils. Consequently, cyanobacteria indirectly become a part of our diet, entering the food chain, and ultimately into the human body.
So, what can we do? Fret not; you can take a few simple steps to lessen your potential exposure to BMAA and subsequently reduce your ALS risk.
Mindful Eating
Limiting your consumption of seafood is an efficient strategy to reduce exposure to BMAA toxins. Seafood, particularly shellfish, often accumulate BMAA. If you love seafood but want to limit your BMAA exposure, opt for fish and shellfish from sources that are regularly tested for algal toxins.
Regular Water Testing
Another useful way of reducing ALS risk is by ensuring the water you use is free from harmful cyanobacteria. Locally sourced drinking water, particularly from private wells, should be tested for cyanobacteria, especially during warmer months when blooms are more likely.
Informed Choice of Supplements
Many people consume health supplements that contain cyanobacteria, such as Spirulina, without realizing their potential risks. Although these supplements can frequently provide health benefits, they can also introduce toxins to the body. Always choose your supplements carefully, ensuring they are laboratory tested for contaminants like BMAA.
Engage Authorities
Last but not least, engaging with local water authorities, environmental groups, and food safety organizations can help raise awareness and enforce measures to monitor and manage cyanobacteria growth within local communities.
Your health is your greatest asset, and standing guard against threats like exposure to harmful cyanobacteria and resultant ALS risk is of paramount importance. By following these fundamental guidelines, we can mitigate our risk and lead healthier, safer lives.
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