Why did people stop raising domesticated species?

Back them cows and pigs were their food and they raised them for food along with farm crops. now we can just stop at any fast food place or restaurant and get processed/GMO food. some farmers still raise livestock/ domesticated animals but most people don't care to raise them anymore.

(a) is not correct because one does not get increased cholesterol  from lifting weights.(b) is not correct because lifting weights cannot reduce the risk of a hereditary disease.(c) is not correct because back pain isn't a benefit! and plus, if he lifts weights properly, he should not have back pain.(d) is the correct answer because his ligaments will gain mass, making it easier for him to carry heavier weights and he will also be stronger!