Super Immunity relies on proper nutrition, especially noncaloric micronutrients and phytochemicals found in plant foods, to optimize the immune system and prevent diseases. A diet deficient in these nutrients weakens immunity and increases disease risk. Phytochemicals fuel anticancer defenses and help the immune system fight infections and destroy abnormal cells through apoptosis.

The book critiques the over-reliance on drugs in modern medicine, citing potential side effects and the influence of pharmaceutical companies. Studies suggest increased risks associated with antibiotics and some blood pressure medications. The author advocates for prioritizing nutrition for true health.

"Super foods" rich in micronutrients have therapeutic potential against various diseases. Cruciferous vegetables like kale and broccoli contain sulfur compounds that convert to isothiocyanates (ITCs) with immune-boosting and anticancer properties. ITCs can also be antiviral and antibacterial. The Nrf2 pathway, activated by compounds in green vegetables, aids detoxification. Proper preparation like chopping enhances ITC production.

Nuts and seeds are also beneficial, providing healthy fats, protein, and micronutrients. The GOMBBS (Greens, Onions, Mushrooms, Berries, Beans, Seeds) acronym highlights essential food groups for immunity and cancer prevention. Mushrooms, for example, have anti-angiogenic and anti-aromatase activity.

The book challenges high-protein diets, especially from animal sources, as excess animal protein can increase IGF-1, linked to cancer risk. It recommends a diet rich in nutrient-dense plant foods, limiting animal products and refined carbohydrates. A near-vegan diet with occasional animal products may offer similar benefits to a vegan diet.

Other recommendations include limiting salt, cautious use of vitamin supplements, and regular exercise. Nutritional interventions show promise for autoimmune diseases. The book provides meal plans and recipes for adopting a Super Immunity diet.