Hello. My husband has been diagnosed with renal cancer. He is 62 and had been quite well ip to diagnosis. We were shocked at the wait time between diagnosis and surgery, but decided to use this time to get him in the best health possible for his surgery and recovery. He’s on pro and prebiotics, drinking more water, walking outside a lot (he is a delivery driver; excellent for fitness), I’m encouraging him to do some deep breathing every day. Can anyone suggest anything else we could do please? He has never smoked and rarely drinks alcohol. 
Thank you