Something else I’d like someone to explain to me - where my experience and the standard advice contradict each other: Fatty acids with no reactive molecular component — normally solid at room temperature. Typically animal fats. → more.

The body is an organism that stores certain energy reserves in the form of fat. This is fat that the liver produces, among other things, from carbohydrates (de novo lipogenesis is the process by which the body creates new fat from carbohydrates, with the purpose of storage for later use → more), when these are present in excess.

The fat produced this way consists predominantly of palmitic acid (C16), but also stearic acid (C18) and myristic acid (C14). These are all saturated fatty acids(1).

That means:

  • The body builds saturated fats from excess carbohydrates, which are then stored
  • Nutritional guidelines advise against eating saturated fat, on the grounds that it’s harmful.
  • Nutritional guidelines recommend >50% of energy from carbohydrates - so carbohydrate stores are regularly so full that no more glucose can be absorbed or glycogen stored.
  • Should the body ever get around to tapping its own fat reserves (weight loss), it “burns” precisely these saturated fats - apparently that’s what the whole system is designed for.
  • Reaching a fat-burning state (ketosis) is something the standard guidelines discourage even more strongly - yet they’re all for weight loss…

What nutrition has done to the composition of body fat

A reenactment of the well-known 'Evolution of Man' meme with life-sized silhouette cutouts, led by a real person looking at their phone
Evolutionary Association, Chapter 1: The Composition of Body Fat

Your love handles are a food diary of the last few years - and many of the entries come from the deep fryer.

So which is it?

What’s the verdict? Are saturated fats good or bad? Only good when the body builds them itself? (Note: it does that during periods of high insulin levels, because glucose and glycogen stores fill up very quickly. You can follow the insulin level right next door.)

I’ve made my choice, and trust current science (*) considerably more than the standard nutritional guidelines. Especially in light of my own long-standing experience with UV sensitivity and sunburn, and the contradiction between fibre and saturated fat, I feel I’m on solid ground: (Natural) saturated fats have been shown to be harmless in enough scientific publications (2). And the arguments against studies claiming the opposite seem more than plausible to me.

With that:

…Everything is better with butter…

More about saturated fats

A reenactment of the well-known 'Evolution of Man' meme with life-sized silhouette cutouts, led by a real person looking at their phone
Evolutionary Association, Chapter 1: The Composition of Body Fat

Your love handles are a food diary of the last few years - and many of the entries come from the deep fryer.

Butter on the table
Fibre and Saturated Fat

The classic mantra “fibre == good, saturated fat == bad” contradicts itself (and what butter specifically has to do with it)

A man in swim trunks on the beach, looking out at the ocean. Photographed from behind — we're looking at the ocean too
Sunburn and UV

A surprising side effect of switching to a ketogenic diet: a new built-in sun protection factor

  1. The body doesn’t store them exclusively saturated fatty acids, but transforms a few of them to monounsaturated fatty acids, to keep the consistency of the stored triglycerides at a reasonable level for further metabolic use.
  2. Do you need references to scientific publications? The Big Fat Surprise has plenty of them, puts contradictory findings in very comprehensible context, and describes how the current guidelines came about