As is known to all, we live in a world of germs（细菌）. It is impossible to avoid exposure. Genetic makeups may give some people advantage over others. However, it does not stop people (become) sick.
All of us have been a victim of an (ill) at some point in our lives. Moreover, it is likely that we (get) sick again in the future. Our best chances of avoiding sickness (be) by exercising and employing good (habit).
While good hygiene and exercise serve as obvious advice to most people, eating healthily is not always obvious. If you cannot define ＂healthy＂, then your immune system will be happy (tell) you. The immune system is the foundation of our health. It works for us every day to keep us well. Ask yourself: ＂Are you making its job easier harder?＂
Like any system, the immune system is no (difference). It has a tolerance too. If you eat unhealthily, your immune system will make you aware of it.
Take a step the right direction by including some healthy food in your diet.
