No. Eating the same thing every day says that you do not value putting out energy for variety of taste. It says nothing about your willingness to accept persistent discomfort.
"persistent discomfort" is not necessary. I know people who swim in open water; it seems too cold for me, but they are not in persistent discomfort. I know people who drink coffee, it's too bitter for me, but they are not in "ersistent discomfort.
Pain is the body's way to signal illness or injury, when the pain is signalling inaccurate, the brain can learn to not feel the pain.
From experience, I know that these things are not comparable. Swimming in open water is fine after a few minutes of adjustment. I have learned not just to drink coffee, but to prefer it without sweetener.
But I spent over a year at perhaps a 10-15% reduction in calories. Persistent discomfort never went away for me. I was only able to maintain the diet by my constant awareness of concrete and measurable progress towards a specific weight loss goal.
I believe that I have more willpower than most, and diets are probably easier for me than most. Yet I doubt that I could live the rest of my life on a calorie restricted diet for the sake of living a bit longer.
I find the opposite. When I experience hunger, if I wait for an hour or two I forget that I'm hungry. Just today I was working and skipped breakfast. Around lunch I thought I should get up, but I kept working. I forgot to eat until I had to stop for a meeting at 4:30pm. Suddenly I remembered my hunger and grabbed a banana.
I still struggle with overeating when I'm hungry and there's food in front of me.
I eat the same every day - but I still wouldn't do long term calorie restriction - I enjoy being physically strong quite a bit more than potential years in my 80s
Some people eat the same thing for breakfast and lunch every day, by choice. Anyone like that would say that hunger is well worth a longer life.