I didn’t hear it that way. It was a set of new connections between reward centres in the brain and those that govern food/appetite. In exactly the same way that you would see if taking a known addictive substance.
Which suggests that the sensory experience of ultraprocessed foods is literally addictive. And that the more of it you have, the more cemented those pathways become, and the more of it you crave. (It’s not like he never ate anything ultraprocessed before, it was the proportion that was different). Which makes me wonder if there may be some sort of ‘tipping point’ where moving back to eating more minimally processed (less addictive) alternatives becomes much harder. Could explain a lot of the difficulty that public health initiatives have encountered over the past 30 years or so.
I just watched that part again.
He made the comments, that the MRI
"Linked up reward centres of his brain with areas that drive repetitive automotive behaviour"
He did comment it was something you might see in persons with an addiction.
But there was no comparison or reference to any normal behaviour, or other links, just that his had changed.
It was portrayed as the food itself caused it, it could just have been the experience was enjoyable, and yes, he did like eating things like the pizza, or the burger, I know I have some foods I prefer, and others I don't, from the width of the unprocessed to ultra processed spectrum.
I think you are right about the tipping point. After a time all you remember is the food you like to eat, and if the balance swings to junk, taste, texture, ease of eating and filling you quickly, that'll become what you want.
It was a bit like his before and after picture.
Before, standing up straight, neck stretched up, stomach pulled in, chest out, arms straight, after, slouched, head down, everything relaxed for the camera, it wasn't a like for like pose.
I'm certainly not arguing that junk food is bad, just that some of the reporting could have had a better explanation, but that's difficult to do in a one hour program.