VA.gov | Veterans Affairs

Here is a VA webpage on Cancer and health and nutrition. Nutrition is important in both cancer prevention and cancer care. Eating well before, during and after treatment can help manage side effects and improve outcomes of treatment. Following are some (but not all) of the info topics available on the webpage. (You can also click here https://www.nutrition.va.gov/Nutrition_and_Cancer.asp ). The site has the links:

Oncology Nutrition Information
Altered Taste and Smell
Being Active with Cancer
Colorectal Cancer: Reducing Your Risk
Cooking for Cancer Symptoms
Dehydration and Cancer
Eating Well During Esophageal Cancer Treatment
Guidelines for Cancer Prevention
Guidelines for Prostate Cancer Survivorship
Preparing for Prostate Cancer Treatment
Nausea and Vomiting
Nutrition and Cancer-Related Fatigue
Nutrition and Carcinoid Syndrome
Nutrition Therapy During Head and Neck Cancer Treatment
Poor Appetite
Oncology Cookbook

Also:
American Cancer Society: Nutrition for People with Cancer*
> https://www.cancer.org/cancer/survivorship/coping/nutrition.html
> https://www.cancer.org/content/dam/CRC/PDF/Public/6711.00.pdf