It has been well researched on humans. No suffering as long as the basic needs are satisfied.
Applies to us 'free' people too.
We 'want' to do certain things, but can not as we are forced into a certain environment.
The thinking is that this is the reason we feel good, de stressed, happy, etc, when we leave our usual life and venture into nature. or just sit in the garden with a beverage, watch and listen to the wildlife, flowers.
So yes, you are correct in that sense. But do Londoners suffer? Do battery chicken suffer?
Our modern life is as far removed from the natural existence as it can be. Compare your life to a life the San or other 'primitive' people still living the 'old way' lives.
I do not remember the exact figure, but people living like the San or Aussie FN only 'work' for what they need on average a couple of hours a day. The rest - relax, play, sing, dance.
I worked 11 hours a day for 6 days a week in UK.
Most of you guys do it too.
To go back to the diet, I think that science today basically advocates a Vegetarian diet with a piece of animal protein added 4 or 5 times a week or something.