Citation needed. Not all fats are created equal.
For example Inuits consume 50% of their calories from fat [1]. They do not have the "western diet disease" (obesity, heart disease, etc.)
It really IS the processed fats that are bad for you. You can see this all over the world when Aboriginal peoples are introduced to industrial cooking / ultra-processed foods / "western corporate diet".
They literally get addicted, and their body size increases by double digit percentages within a generation. This also happened in the US, but happens faster around the world. The average body weight for a man in the US increased from ~166 in the 1960’s to ~196 today [2].
This is an amazing fact that needs an explanation if you don't believe it's a result of the rise in industrial cooking.
And if you believe in capitalism, you would have to explain how this would NOT happen. Why wouldn't companies gradually develop cheap, consistently manufactured, addictive foods? The profit motive would lead them there, even if it weren't intentional.
I suggest reading some of Michael Pollan's books like Omnivore's Dilemma or Cooked; they talk about this (and probably talk about Inuits specifically as far as I remember)
[1] https://en.wikipedia.org/wiki/Inuit_cuisine
[2] https://www.washingtonpost.com/news/wonk/wp/2015/06/12/look-...
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Another anecdote: I know someone from the Midwest with "industrial cooking disease" who dropped from 350 lbs to 200 lbs in a year by going on the "carnivore diet", where he ate exclusively beef and chicken (yes, literally).
I remember someone else remarking the same thing on HN, and observing that going vegan can have the same effect.
https://news.ycombinator.com/item?id=19177116 (not sure if this is the thread but there are many of them on HN)
Hypothesis: Both the carnivore diet and a vegan diet are BOTH suboptimal. The reason that they help many people with "western diet disease" is that you eliminate industrial cooking / ultra-processed foods from your diet.
The human body is extremely flexible and can metabolize a wide variety of things in the environment. What it apparently can't metabolize is addictive foods that corporations have created...