Some treatments have side effects that may affect your nutrition, such as loss of appetite, nausea, or difficulty swallowing. You should inform your medical team of these side effects, or if you are struggling to maintain your weight.
Quality of calories is often just as important as quantity of calories.
In general, a proper diet will help you feel better overall mentally and physically. Eating the right foods before and during treatment can help you keep up your strength, spirit, energy. It can also make it easier to tolerate treatment-related side effects.