Advanced kidney cancer is not contagious from person to person. Kidney cancer is when the tissues of the kidney undergo abnormal proliferation and the condition has advanced to a late stage. Generally, it is recommended that patients with kidney cancer follow a high-protein, low-salt, low-sugar diet, avoid foods that increase the metabolic burden on the kidneys, and focus on fine, refined, and soft foods to improve the efficiency of nutrient absorption. Patients can eat more fruits and vegetables to increase their intake of vitamins and fibers. It is also generally advised for patients to eat more garlic, avoid eating leftovers, overnight foods, pickled items, abstain from alcohol, especially strong spirits, and avoid smoking.