Is there any evidence beyond correlation that high fat diets are unhealthy?
Also the researchers measured mice intestinal biome at 14 weeks, given that the lifespan of bacteria is probably similar whether in mice or in humans, I wonder if the comparison to human lifespan is valid, considering that a transition that takes x mice-years may only take y human-months, so to speak.
There's data pointing that Omega-6 fatty acids (primarily vegetable/seed oils and trans fats) are harmful.
See the following talk by Dr. Chris Knobbe:
You can jump here for the studies:
What kind of fats are we talking about exactly. Trans-fats? Rancid fats. Fats in cured meat? Fats from seed oils? What kind of seeds? Vegetable fats? If so again what kind? Maybe you think olive oil is okay. What if I told you 90% of olive oil is adulterated? Animal fat? What's that animal been eating?
The last one is interesting. Before WWII frozen chicken really wasn't a thing because frozen chicken tasted rancid after it was thawed. Someone figured out you could fix that by switching the feed from linseed to corn.
I would 100% agree that a high-sugar low-fat diet is more dangerous than eating high-fat low-sugar, but high-fat high-sugar is a hell of a lot worse than either of the other combinations - and a more common diet in the population at large. That's probably more relevant to this study, as limited as it is.