Blue zones -- Brewer's yeast -- Caloric reduction -- Chicken soup -- Cold showers -- Detoxification -- Eating dirt -- Friends -- Garlic -- Germ avoidance -- Good genes -- Herbal remedies -- Hydrogen peroxide -- Lifting weights -- Napping -- pH balance -- Plant-based diet -- Positive attitude -- Probiotics -- Running -- Spirituality -- Stresslessness -- Stretching -- Vitamin C -- Yoga.