Male sperm count has fallen by more than 50% globally in the last 50 years, leaving researchers scrambling to understand why. Could it be pollution, PFAS and other potential toxins in our food and water, an increase in obesity and chronic disease, or even the ever-present mobile phone? A new study explored the role of cell phones and found men between the ages of 18 and 22 who said they used their phones more than 20 times a day had a 21% higher risk for a low overall sperm count. The men also had a 30% higher risk for a low sperm concentration. The study did not specify whether the men called or texted or used their phones to do both. Radiofrequency electromagnetic fields are greatly reduced when texting and highest when downloading large files, streaming audio or video, when only one or two bars are displayed, and when in a fast-moving bus, car or train, according to the California Department of Public Health. The agency recommends keeping the phone away from the body and head " use the speakerphone or headphones instead " and carry the phone in a backpack in a backpack, briefcase or purse. Studies in mice have found RF-EMF fields at levels similar to cell phones do lower male fertility and contribute to sperm death and changes in the tissue of the testes. Observational studies in humans have also found that frequent use of mobile phones was connected to a decline in sperm viability as well as an impact on how the sperm swam.