Quality of Life

My husband has been trying to gain weight for the last year by eating as many calories as he can through the highest caloric dense foods (refined processed foods) which are not the most nutrient dense foods. As I tell people about my husband's choices, knowing I am a nutritarian, people are telling me, "well he wants quality of life".

Now my husband's cancer has metastasized to his liver, and I am questioning "what is quality of life?"

To me it means
being pain-free,
having many more great days than bad, both physically and mentality,
being able to take care of myself,
not having doctor appointments, surgeries, treatments, taking medicine...
not spending the day in bed or on the couch but being able to do the things I love with the people I love.

My questions are
- when did what one eats define "quality of life"?
- has the food industry "hijacked" our minds and taste-buds through processed high-fat, high-salt, and high-sugar to the point that donuts or eggs and sausage define "quality of life" instead of "living life"?
- what does quality of life mean to others?

I would love feedback...