DJB
With a cancer diagnosis, it is time for healthful, system supporting foods and meals. Weight loss, with the body under stress, is a question for his cancer and primary doctors. Ask for a referral to a nutritionist to help with dietary needs and planning.
Ask your care team (yes, you need a whole team of doctors, nurses and other medical people) about nutrition supplements, such as Ensure or other brands. The whole body requires continuous attention now; it is not a good idea to focus only on the cancer. A check up and ongoing advice from his primary can be of great benefit.
Be sure to have ALL his medications reviewed by the doctor every time a new medication is ordered. Watch out for interactions between meds.
Thanks you for being there for your husband.
Best,
Jack