I will bet the people who tested the host you speak of, were adevout roman catholics.
If you want to prove to everyone that every consecrated host turns into blood and flesh then save your host and take it to a university science lab and get the results. The results will be unleavened bread with a pinch of salt. GURANTEED BUSTED!
Every year dozens of roman catholic women around the world claim to see Jesus or Mary on their bread/toast, or highway overpass. They contact the media, thousands of BELIEVING pilgrims show up holding candles. Bad news is always reported. The most interesting part is that no one has any idea what this man Jesus or Mary would have looked like if they did ever exist, but catholics have engrained in their minds that Jesus looks just like the sacred heart of Jesus picture that was "made up" centuries ago and catholics WANT Jesus to look just like that. If they saw an image of a short man with a hunch back and big nose they would never call the media or attention to themselves that this was Jesus. Mary is always a young fair maiden wearing a blue shawl.
I say BUSTED!