As entremet said, being fat is a recent development on a macro scale. Do you think 2.5 times the amount of people in 2017 are lazy compared to the mid-1970s? If so, what made people not lazy in the 1970s?
Physical labor for one, When I started working in the trades I started in roofing, 8-10 hours a day going up and down ladders with my shoulders loaded with shingles in hot weather. As time went on people got more concerned with occupational health and safety.
Manual portable hand winches were temporally installed on roofs. They had to be hand cranked but was 100 times less intense then before. Now they are electric as well. Even zoom booms and scissor lifts are common on even small construction jobs.
Also how many people worked in a office in the 70`s compared to physical labor whats the ratio now?
When you physically carrying bags of concrete, or lumber, or coal, or piping, hell even pipe wrenches use to weigh a 100 pounds, forged steel. Now they are aluminium and weigh a tenth of that..... you couldn't over eat calories if you wanted to.
I cant talk about any one else but myself, but in the winter when I`m behind a desk planning jobs all winter I put on 20-25 pounds easily. But when summer comes along and I`m working shutdowns and doing 12 hour days of climbing stairs and carting tools and equipment around I drop the weight. Zero change in diet, other than in the summer I drink alot more (empty calories)
How am I able to drop the weight but I dont change what I eat at all?
I could take any individual that says that cant loose weight, bring them with me too pull wrenches for 3 months 12 hours a day in the summer working the oil sands and I promise you you will drop weight without changing a thing with your diet.