F1's post about fat reminded me it's time for another rant.
Some of you might remember a commercial that ran on British TV during the late 80s or 90s. Unfortunately I don't remember the precise plot, but it was pretty simple: several seconds of someone pouring sticky, gloopy grease down the sink (which naturally clogs the pipes) with the implication that that's what fat does to your arteries.
If the UK advertising watchdog had any scientifically-literate members, they would have pounced on that as one of the most dishonest campaigns ever to be devised.
1) Fat does not get simply poured into your arteries. The process goes like this: as fats pass through your small intestine, they gets snipped apart into monoglycerides and free fatty acids. These molecules are small enough to pass through the intestinal wall; on the other side they are re-assembled into triglycerides and packaged into chylomicrons (large lipoproteins). These enter the lymphatic system and ultimately end up in the bloodstream, where they circulate until something that requires either fat or cholesterol removes them.
2) Arterial plaques are not fat deposits. Although they do contain fats and cholesterol, "mature" atheromas are hard lumps containing a lot of calcium and fibrous material.
3) Atheromas are not deposited on the inner surface of arteries. They are built up - deliberately, we assume - beneath the epithelium. The idea that fat transported around in the bloodstream might "silt up" one's blood vessels is pretty bizarre given the design lifetime of those vessels, and the manner in which fat is transported around (ie., carefully packaged up).
I'm a sample of one, but as far as I'm aware my 15-year experiment with LCHF has not resulted in furred-up arteries. My 1km run time is a shade under 4 minutes. My bodyfat is around 10%. I don't have any of the chronic diseases that affect middle-aged people, nor do I have any of the issues that specifically affect middle-aged men. Apart from a few wrinkles and grey hairs, I look and feel as good as I did in my 20s.
The dieticians will say: ahhh well, you may look healthy, and you may have excellent cardiovascular performance, but you're still going to die of a heart attack, because cholesterol. To which I have two responses:
1) Is that even logically possible? People who eat high-carb low-fat diets acquire Metabolic Syndome with about a 30% "success" rate. By the time they reach my age, many of them are overweight and creaking at the seams. Yet because they follow orders, they're healthy, and I'm not. Hmmmm.
2) But let's say the nutritionists are right. I'm going to die of a heart attack. Well, so what? There are worse ways to go. Cancer, for example. Or COVID-19 - and I'm pretty confident my general state of health gives me a statistical advantage there. I'll happily trade the way I look and feel for an abbreviated life. I certainly wouldn't want to live an extra ten years if it means being overweight, impotent, prediabetic, and lethargic.
I suspect you might get away with pouring some sugar water down though, of course that wouldn't make a diet of sugar water a healthy one.
Wanting to try this! 
Skinny fat