@Silvian Dr. Phinney says that when people tell him they can’t cope with the amount of fat they are eating because it’s making them feel sick, it almost always turns out that they are consuming too many polyunsaturated fatty acids, which in quantity cause nausea.
The only fats we are required to eat are ω-3 and ω-6 polyunsaturated fatty acids; they are essential to the human diet because the body cannot make them. We also don’t need too much of them, and ω-6 fatty acids cause inflammation if over-consumed. Saturated fat, on the other hand, has many beneficial effects; in particular it raises HDL cholesterol, and is the only substance that does so, apart from a drug with nasty side effects that never made it to market. Monounsaturated fat is used by the body as fuel.
The fact that butter, tallow, lard, and bacon grease are nearly fifty percent saturated and nearly fifty percent monounsaturated fats and contain almost no PUFA’s is why they make such great cooking fats. The fruit oils, avocado, coconut, and olive, contain more PUFA’s, but not so many as to cause nausea. Most of the seed oils, on the other hand, have extremely high percentages of PUFA’s.
Weight loss in women seems to be more hormone-related than in men. A further complicating factor is that many women have restricted their caloric intake for so long that when they go keto and finally give their body enough energy, the body wants to put on lean muscle as well as shed excess fat. This can cause the appearance that keto is not working for them. The good news is that, since muscle is considerably denser than fat, it is possible to shed inches while not losing many pounds.
I suspect it doesn’t help that we generally speak of “weight,” when we really mean “fat.” If you are not losing weight, but your clothing size is shrinking, I would suggest that this is exactly what you want to happen. Putting on muscle causes your basal metabolic rate to increase (because you have more mitochondria with which to burn fat), as well as making you stronger and healthier; and losing excess fat can only be a good thing.