The loss of muscle mass and weight loss is seen often in people who are getting treatment for cancer. In addition to getting protein to prevent this, they also need to eat a lot of vegetables and fruit such as berries, broccoli, carrots and citrus fruits. Vitamin C is great for people who are going through radiation treatments, and citrus fruits are loaded with this essential vitamin. People sometimes have a loss of appetite if they are getting treatment, so it may be best to consult a dietician so they can help figure out the best diet plan for the person’s body type, height and personal needs. Eggs, meat and raw fish should be avoided by all cancer patients whether they are receiving cancer treatment via radiation or not. Since difficulty swallowing is a side effect of radiation treatments, people may have a hard time eating to get the nutrients that they need. They can try milkshakes, mashed potatoes and other soft foods to replace things that they should be eating. Fruit smoothies are a terrific way to get their fruit intake if they have trouble eating.