Brain fog from chemotherapy and radiotherapy

It's distressing when a patient's oncologist refuses to recognize that their chemotherapy or radiation treatments can cause cognitive dysfunction as a serious side-effect. As stated in this paper published recently in the prestigious medical journal The Lancet: "Treatment-induced CNS [central nervous system] toxicity remains a major cause of morbidity in patients with cancer...subtle changes such as progressive cognitive dysfunction are increasingly reported after radiotherapy...or chemotherapy." Everybody needs a strategy for brain health, all the more so with these demanding interventions.