Stress may make pain, bloating, nausea and other stomach discomfort. Vomiting may occur if the stress is severe enough. Furthermore, stress may cause an unnecessary increase or decrease in appetite. Unhealthy diets may in turn deteriorate one’s mood
What makes people healthy can be the type of food they eat such as salad, vegetables and other foods. What makes people unhealthy is when they eat junk food or they eat fast food everyday. I am not saying that to offend anyone. It is just how their parents feed their children to eat the right food to live a healthy lifestyle. It is not only that people are healthy physically. It is also by trusting God with all of your heart. If you don't believe in God, that's okay. Other people exercise so they can lose weight. That is how people can people can be healthy and how people are unhealthy. I am not too sure how to explain the second question but I hope this answer helps you :)
BAI is the Bureau of Animal Industry. One of the BAI's discovery is the parasite that caused Texas cattle fever.