The nurse, who works in England, contacted The Herald after reading about the row over the feeding of cancer patients at the Beatson West of Scotland Cancer Centre in Glasgow.
Long-stay patients receiving bone marrow transplants and chemotherapy have complained about the food served to them.
The use of microwaves for patients to reheat food brought in by their visitors is forbidden. After cuts, the Beatson has one full-time dietician.
The situation in many English NHS trusts is different, after pioneering work in Nottingham and London.
"All our neutropenic patients [those with a low white cell count, making them vulnerable to infections] have diet sheets, prepared by our team of dieticians. They are put on a grazing diet of up to six mini-meals a day, served on side plates, because these patients tend to have poor appetite but need to keep eating," the nurse said.
"Menus feature food high in antioxidants because that is what cancer patients need."
The nurse, who asked to remain anonymous, said that cancer wards have an extra budget to pay for the nutritional needs of patients.
"Our ward manager's maxim is 'What the patient wants, the patient gets'," she said. "Anyone who is neutropenic or deemed by the dietician to need extra food, can order virtually what they like.
"Patients are weighed every day and weight loss over more than two days triggers alarm bells. Studies have shown that the cost of keeping such patients in hospital for longer is far more than giving them all the food they want. There is a fridge and microwave in every room, so that patients can reheat food brought in by their visitors."
At the Beatson patients are weighed weekly and the dietician may offer advice to someone who has not eaten for several days but there are no special diets for cancer patients and visitors are only permitted to bring cold food.
"I'm quite surprised. It sounds rather old-fashioned," the nurse said.
NHS Greater Glasgow and Clyde has said it will review the food it serves.
Board members are to be invited to visit the "superkitchens" which supply its hospital meals to sample the foods.
Herald journalist and leukaemia patient Anne Johnstone first raised concerns about the Beatson food and obtained sign statements from disgruntled fellow patients.
She received no dietary advice on discharge beyond being told to avoid soft cheese and wash vegetables thoroughly.