Permanent alterations in thyroid function are actually quite rare. Most of the time the changes are very transient (because thyroid, especially T4 to T3 conversion, is transient in order adapt to nutrient intake). Likewise, minerals, macronutrients, and vitamins can adversely affect thyroid function, but again, it is transient and easily fixable.
The dude added in a bunch of foods he had been eliminating for a long time, and is getting older (moving away from the heightened metabolic state of a teenager). It's not rocket science that you would put on weight after that. Sometimes (most), it really does come down to something as simple as too many calories and making psychological errors.
This. While I'm sure it's possible to
permanently damage thyroid function and the endocrine system, that's a lot harder to do than Holt seemed to be suggesting.
Permanent damage would take some very extreme behaviors done consistently over an extended period of time. The very fact that wrestling has seasons, and the fact that fighters are not having to make weight every week for their entire life makes doing permanent damage a lot less likely. I would suspect female models are at a lot more risk, as modeling does not have seasons.
As to his suggestion that wrestlers are fat when they are older, even with an active lifestyle and good diets, due to damage they did while they were cutting-I am going to have to call BS on that as well. I think you will find that for the vast majority of the time, it is down to food and lifestyle choices.
When I was wrestling in college during the late 1980's and early 1990's, weigh-in regulations were probably as lax as they were at any point in history. We could basically weigh in
any time we wanted the day before the match. You could weigh in at 8:00 am on a Tuesday morning and be wrestling at 8 pm on a Wednesday evening. That's 36 hours. That's more recovery/rehydration/refueling time time than MMA fighters and boxers have today.
Thankfully, I was not at the top of the food chain in college, and I was not having to cut all the time. But I remain friends with most of the wrestlers that did. Some of whom were all Americans. And without exception, the ones to have a good diet and exercise regime are fit and thin, and the one that don't are either fat or thin-fat.