Industrial scale farming is creating "institutionalized" plants - we call them "fields", but they could be looked at as industrial plant camps, were plants don't have to do any effort to grow - there are no pests, there is no competition from other plants, there's plenty of food (fertilizer) and water, etc. We take care of everything for them so the plants grow up big and "lazy".
Similar thing is happening to farmed animals, who are fed these "lazy" plants and kept in similar "food camps" in conditions which prevent physical movement, competition or effort.
Plants or animals, goal is to obtain highest weight in shortest amount of time in order to increase profits.
I remember the taste of the vegetables from my grandmother's garden. Rich, full and powerful. Plants were strong, showed signs of fighting for survival - having scars and being bitten by insects, etc.
My grandmother took care of those plants personally. She talked to them, she touched them, she collected pests manually. Similar thing with the animals that she had on her farm.
Of course there was no obesity in my grandmother's village.
I think there is a connection between "lazy" plants and low energy that it generates in their consumers - be it humans or animals. This "laziness" and the instruction to grow to large sizes may be transmitted from species to species by mechanisms which might not be known yet.