Pretty thick book to talk about a single thing, I read the first chapter, I doubt if most would call it simple, as far as I could tell, the single thing they suggest is eat more peanut butter (at least it's a novel solution)
From the Back Cover
The Immune Advantage
Cut your risk of all major disease by at least 20 percent.
Nothing science has discovered can match the power and effectiveness of your immune system-- when it is operating at full capacity. That's why boosting your immune system is the single most important thing you can do for your health.
The Immune Advantage brings you the newest, most comprehensive information on how you can activate the healer within and learn how to:
* Prevent colds and flu all year long
* Guard against cancer, diabetes, and heart disease
* Overcome allergies and environmental toxins
* Avoid the pain of arthritis
* Boost your energy to new levels
* Activate the top immune boosters and duck the immune busters
* Nourish your immune system with 50 delicious recipes
* Ignite your immune system with Dr. Berndtson's patient-tested MaxImmunity Plan
* Tap into the source of stress reduction and emotional wellness
* Take advantage of the immune-boosting secrets of more than 95 experts including herbalists, nutritionists, M.D.'s, and alternative practitioners
