Do We Really Face A Human Fertility Cliff-Edge? Science Offers Hope
Jules Siedenburg, 7 Aug 17

Spirulina is a blue-green algae with multiple uses. Shutterstock

A friend recently confided in me about his fertility problems. His physician had told him his sperm were small and malformed, to the point that he might struggle to get his wife pregnant. In an effort to make him feel less bad, perhaps, she added that male fertility problems were currently at “epidemic” levels in the UK.

Recent articles in several major news outlets told this same worrisome tale. For instance, one BBC headline screamed, “sperm count drop ‘could make humans extinct’”. These articles were based on authoritative new research that found a large and continuing fall in sperm count across numerous countries, as also reported in The Conversation.

Under current trends, this could lead to human males being largely infertile by 2060, with exposure to toxic chemicals and unhealthy lifestyles thought to be the main causes. As if there weren’t already enough problems in the world, what with geopolitical tensions and issues such as war, poverty and climate change …

So are we doomed? Well, there may be cause for optimism.

Various natural remedies are touted as ways to increase men’s sperm count by the popular press, fertility websites and blogs. Examples include eating healthy foods, exercising regularly, and limiting time spent at a computer.

I cannot comment on such claims. I can, however, share relevant insights from my own work, which involves researching algae and its potential to help poor communities in the global South meet their food needs. While I focus on algae as a food, it also has various other uses, such as animal feed, pharmaceutical applications, and energy production. Given the headlines about infertility, I wanted to report what researchers have learned about edible algae (notably spirulina) and its linkages to fertility.

What the science says

One way to assess any new health treatment is human trials, another is to test it with animals. To date, most research on the significance of edible algae to fertility has involved animal studies. Firm conclusions therefore cannot be drawn about the applicability of this work to humans. These early studies nonetheless flag linkages that could equally apply to humans.

The available science reveals substantive and sometimes dramatic improvements in male reproductive function thanks to spirulina. The following examples show this effect consistently in a range of different contexts, as reported in peer-reviewed academic papers by researchers from institutions such as the University of Cairo, the University of Tasmania and Mexico’s National Polytechnic Institute.

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