Ehret elaborates his "mucus theory of disease": most ailments come from mucus‑producing foods (especially starches and animal products) leaving waste deposits throughout the body.
The mucusless diet—a regime centered on fruits, leafy greens, and non‑starchy vegetables—is proposed as the ideal way of eating for restoration and long‑term health.
Fasting and diet are inseparable in his system: periods of abstinence loosen and remove old waste, while the mucusless diet prevents new accumulation.
Ehret emphasizes a gradual transition diet, acknowledging that sudden radical change can be dangerous or impractical for heavily burdened modern bodies.
Health is described not just as normal lab values but as lightness, energy, and mental clarity—signs that the body’s internal obstructions have been cleared away.