First, no one can know all environmental data. Second, no one can know all physiological data. Third, no one has a comprehensive knowledge of all workings of the human heart. Even the devout materialist cannot know the mere functioning of the nervous system. I here cite to recent studies which concern neuro-physiology which were not even considered until a few years ago:

Duke researchers have shown that microbes can control the actions of their animal hosts by manipulating the molecular machinery of animal cells, triggering patterns of gene expression that consequently contribute to health and disease. The work, which was conducted in zebrafish and mice, could have implications for human inflammatory bowel diseases like Crohn’s disease and ulcerative colitis. The findings appear in the journal Genome Research.

“Our results suggest that ancient parts of our genome and ancient interactions with our microbes are relevant to modern-day human diseases,” said John F. Rawls, Ph.D., senior author of the study and associate professor of molecular genetics and microbiology at Duke University School of Medicine.

In recent years, scientists have uncovered abundant links between our trillions of resident bacteria, viruses and fungi—known collectively as the microbiome—and a spectrum of human conditions, ranging from anorexia to diabetes. But Rawls says important gaps remain in our understanding of how these microbes influence health and cause disease in humans as well as other members of the animal kingdom.

Read more at: https://phys.org/news/2017-05-microbes-action-host-genes.html#jCp