Have you seen the movie The Martian? I highly recommend it. The premise is that an astronaut called Mark Watney goes with a team to Mars, gets left behind and has to survive. I love semi-disaster stories and even better when it's Matt Damon playing the main character. Now, according to the book, Watney had lots of vitamins and mineral supplements to supplement his diet. But if he hadn't had those supplements, there are certain elements that he could have become deficient in that could have led to severe health problems.
Let's explore some of the metal elements that ZRT tests that you might want to take with you on your mission to Mars.