Good nutrition is an important part of environmental health.  By having a healthy diet we increase our body's ability to maintain homeostasis.

Homeostasis refers to the ability of an organism to adjust its internal environment to compensate for changes in the external environment.   For example, when you are cold, your brain automatically tells your body to shiver and your skin's pores to close (goose bumps). Shivering helps generate heat and goose bumps help reduce heat loss.

Homeostasis can only adjust an organism's internal environment to a limited degree.   Thus, when we are very cold, we put on a coat or find shelter to compensate for the adjustments homeostasis cannot make.

An important part of maintaining homeostasis is the immune system.  The immune system helps us fight disease and the effects of toxicants   that enter the body.  The best way to help our immune system is by making sure we eat a diet containing a proper supply of vitamins, minerals, proteins, carbohydrates, fats and water.