The diet of kidney cancer patients should ensure nutritional balance and should avoid spicy and stimulating foods, as well as foods that increase the metabolic burden on the kidneys. Currently, there are no reports indicating that eating fruit has a clear impact on tumor progression. This is because fruits primarily contain large amounts of water, sugar, vitamins, and trace elements, which are essential substances for normal human body functions. Vitamin C has a positive effect on body immunity, so consuming more fruits can be beneficial for health. Kidney cancer patients should increase their protein intake to compensate for the depletion caused by cancer. Here, I recommend a concept of prolonging life with illness, and everyone can search for more information on it.