Eating within an hour before exercising.
the number of calories burned is so insignificant - less than 1 calorie no doubt
Radiation necrosis, a focal structural lesion that usually occurs at the original tumor site, is a potential long-term central nervous system (CNS) complication of radiotherapy or radiosurgery. Edema and the presence of tumor render the CNS parenchyma in the tumor bed more susceptible to radiation necrosis. Radiation necrosis can occur when radiotherapy is used to treat primary CNS tumors, metastatic disease, or head and neck malignancies. It can occur secondary to any form of radiotherapy modality or regimen.
An average woman needs 2000 calories a day to maintain, and 1500 calories a day to lose weight. Therefore, I believe the answer you are looking for is 2000.