Another reason is that for about 300 years people in Europe who did things that made their neighbors tremble in horror† had to flee for their lives, and a lot of them fled to parts of America including Argentina and the US. Consequently the US is rather full of people who are inclined, culturally or possibly genetically, to put whatever crazy ideas they happen to believe into actual practice rather than following tradition or majority opinion. Diet fads in the US go back at least 200 years.
Myself, I dropped 17 kg on a carnivore diet starting a couple of years ago, and I've kept it off on a much more mixed diet since then.
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† Quakers, Puritans, Anabaptists, Old Believers, Jews, etc.
If the thesis is that obesity came from removing saturated fat from the diet, why is it that there wasn't problems with obesity during WWII when saturated was strictly rationed out of the general populations diet?
I mean, FFS, magazines sold magic powders to woman to help them become fatter. (Being too skinny was seen as unattractive).
That thesis is clearly wrong, though there are still people who believe it. If you want to spend ten minutes getting better informed, you can read a chapter-length thorough rebuttal at https://slatestarcodex.com/2020/03/10/for-then-against-high-.... Reading the sources it cites will take you longer than that. But the very simple explanation is that it is well known that traditional diets that do not produce high levels of obesity include many different levels of both fat intake and saturated-fat intake. Whatever is unique about the modern industrial obesogenic diet of ultra-processed foods, it isn't that it contains uniquely low levels of saturated fats.
The research behind ultra processing has legs from what I've read. My none expert take is that it has more to do with the fact that portion sizes are larger and caloric density is higher.
It doesn't take long to find videos of people from all over the world visiting the US and commenting on how much food is served.
That also jives with why drugs like semaglutide work so well at reducing weight.
Large portion sizes are real, but they are downstream of whatever is unnaturally increasing US appetites. Restaurants, housewives, and househusbands in the US don't serve 1500-kcal meals because they're in some kind of conspiracy to fatten your kids up for slaughter. They serve them because people complain if they don't.
The "ultra-processed" meme is clearly pointing at something critical, but it can't itself be the answer, because it's ontologically incoherent. As the post I linked above says:
> I’ve previously found [this meme] frustrating – it reeks of a sort of unreflective technophobia. What part of processing makes food bad? How does mere contact with a machine turn food from healthy to unhealthy? What food counts as “processed” or “not processed”? Is ground beef processed, since you grind it? Are scrambled eggs processed, since you scramble them? Is bread processed, since wheat doesn’t grow in loaves? Is water processed, since it goes through water processing facilities? Is the Eucharist processed, even though the processing only changes its metaphysical essence and not its physical properties? Everybody I ask acts like the answers to these questions are obvious, but everyone has different answers, and nobody can tell me their decision procedure.
So, is it corn? Missing micronutrients? Industrial polysaccharide thickeners? Fungicides like propionate? Nanoparticles of titanium dioxide? Antinutrients like phytate and citrate reducing bioavailability of polyvalent-cation micronutrients? Some combination? Lots of people have promising hypotheses but nobody knows. Anybody who claims to know is either lying or insane, often both.
I think we have some experimental evidence to suggest that at least some of the UPF associations are due to texture - those foods that you can basically inhale without chewing seem to drive higher caloric intake. We also have an incredibly strong signal of mass gain from sugar sweetened beverages which are also easy to consume with minimal effort.
I think it’s likely that cultural and economic factors play into this too. Japan has the same proliferation of UPFs, yet does not suffer the same obesity effects as the West does. There are probably a number of things that play into this: Japan has an incredible children’s food education policy, and they presumably have a different culture around food (many western cultures emphasise a “finish your plate or you’re ungrateful” approach).
I also have an intuition that the rise of two income households raising children is a factor in this. It’s a lot to ask of a couple that they both hold down full time jobs while cooking the kind of meals that used to be the domain of a stay-at-home parent.
Really interesting area to think about in terms of research and policies, but as you say we just don’t have strong evidence at the moment.
In the meantime it’s great that GLP-1 agonists are available to reduce the damage done, but it’s a shame we have to resort to such things in the first place.
The changes in behaviour are also really interesting. Even after cessation of the drug, it seems like many patients keep healthier eating patterns and while they do put on weight, they tend to settle on a lower weight than baseline before intervention.
So we should absolutely keep an eye on outcomes as time goes on, but so far the results are overwhelmingly positive. These drugs are saving lives and the new ones in the pipeline look significantly more effective. It’s an exciting time to be alive!
Pushing a new diet drives a ton of revenue. Advertising, TikTok, talk content, experts, books, etc.
There's a financial reason Dr. Oz was always on about some batshit crazy new one.
You can see it in TV advertisements too. Once meat consumption took off in the US there was a proliferation of antidiarrheals, antacids, and other medications to deal with the symptoms of a high meat diet. You can see it on TV advertisements. Kind of interesting.
Even today, a high meat diet is a status symbol in the US.
"Avoid saturated fat" "nuh uh our ancestors were alpha males that ate nothing but raw meat and black coffee, we must have evolved for that diet!"
People fall for it because people like eating meat and there's enough bad studies to cherry pick to support that position.
It's not unlike a family member of mine who falls for every woo scam because whatever is being peddled from drum circles to breathwork makes them feel good so of course they spend $3k to become a "professional sound bath instructor".
American culture is increasingly distrusting experts and worshipping flim flam artists because they make a compelling podcast or YouTube video.