Linda Bickerstaff 
Your Immune System [PDF ebook] 

Everyone experiences threats to the immune system on a daily basis. The challenge we face is keeping the immune system healthy throughout our lifetime. This thorough, friendly narrative presents immune system basics and explains infections and how the body fights them. Students receive straightforward advice for creating a strong immune system through maintaining a balanced diet, getting proper sleep and exercise, dealing with stress constructively, and avoiding unhealthy habits. Helpful sidebars are also included to support the text.