The nonsensical "lab animal" argument has been debunked a dozen times. It is bullshit. For animal rights reasons, labs switched to rats and mice being given a perpetual, self-serve diet of food. Unsurprisingly they ended up fatter than mice and rats given portioned foods. When they are given portioned foods...what do you know, they're not fat any more.
"People in the 2000's weighed about 10% more than people in the '80s who ate the same amount of calories, with the same micronutrient distribution, and did the same amount of exercise [1]"
To say that the cited study is laughable gives it far too much credit. For instance it specifically and only considers leisure activities. As to self-described dietary results, the only takeaway is that people are far more full of shit now than then. It is Ginny in the Sopranos boasting about their diet while eating chocolate bars in the laundry room.
It's interesting how gullible people who are otherwise so discerning are when it comes to diet, particularly for dietary excuses. There is no field that has been so rife with study that upsets study, and gross scientific malpractice, as nutrition. But hey, here's one study where they mangled numbers from sets decades apart and drew some viral result. Serious groan.