I’ve been busy and had problems logging in since this post but I’ve been meaning to come back to this.
Aside from this being a kind of irrelevant tangent to the thread in question that we’ve both gone on, we’ll assume for now that this is true - it’s still not relevant. OP is asking about weight loss (more specifically fat loss). Whilst weight gain on a typical diet (with both fat and carbs) may come primarily from the fat and only a limited amount from de novo lipogenesis, the relevant part of the thread, when it comes to weight loss, already assumes operating at a calorific deficit. Due to thermodynamics, you can’t gain weight whilst maintaining a calorific deficit (with some stupid exceptions like becoming more hydrated, subjecting yourself to a greater gravitational pull etc). To be clear here, I’m not saying your arguments are right with typical diets, but I’m basing my responses around them being so to demonstrate why you’re wrong.
So, we’re agreed that you can not gain weight whilst on a calorific deficit, correct? And we also agree that OP is concerned with weight/fat loss as opposed to simply avoiding weight gain for now, yes? Then as I said, all this talk of what makes you fat isn’t relevant here - I’m just as guilty as going off-topic here, but I feel we should claw our way back to the topic at hand.
Demonstrably untrue. If you’d like to research, look into 2,4-dinitrophenol (DNP). It’s a very dangerous weight loss drug that essentially inhibits the ability for the mitochondria in our cells to produce energy from ATP as efficiently as normal. When it comes to high-carb intakes whilst on DNP which would normally cause a very limited temperature rise (if any at all), it hugely increases body temperature to often dangerous levels. This fact alone shows when excess carbs are consumed, most must be used as energy and not released as heat, as otherwise, like is the case with DNP, excess carb consumption would lead to hyperthermia, which doesn’t happen.
And this is where your argument goes a bit weird. If we don’t derive energy from fat, presumably if someone were to only consume protein for muscle maintenance and fat, even if at a calorific deficit they must gain weight. Again, this is demonstrably untrue because a lot of people have success with a ketogenic diet. What you’re trying to get at, I believe, is that assuming the presence of a high volume of carbs in the diet, then fat won’t be used for energy - that’s true to an extent - the carbs get burnt for energy first as it is more efficient. However, if you’re operating at a calorific deficit, you won’t gain fat. If you aren’t getting enough carbs to meet energy needs, the fat is used instead. Again, this is extremely basic and I outlined the mechanisms for the process in my earlier post.
I provide you with mechanisms displaying your flawed argument, you respond with, essentially, “you don’t know what you’re talking about so I don’t need to provide evidence to the contrary”. One of us comes out of this looking far more like we know what we’re talking about.
Depends what you mean by recommended. And vegetable proteins being healthier is debatable - they’re certainly less complete and less digestible than animal proteins, but assuming balance they are likely healthier.
This is the first time your post actually mentions fat loss so now we can go into more mechanisms that explains why ketosis can be beneficial, both for fat loss and generally. First, generally:
Insulin is released in response to carb intake. As per this scientific paper:
“Insulin is probably the most important hormonal factor influencing lipogenesis. By increasing the uptake of glucose in the adipose cell via recruitment of glucose transporters to the plasma membrane, as well as activating lipogenic and glycolytic enzymes via covalent modification, insulin potently stimulates lipogenesis”
So in short, insulin is released in response to intake of carbs, and also potently stimulates lipogenesis (the metabolic formation of fat). Yes, this fat won’t be stored very much if dietary fat intake is zero, but likewise, a great deal of this fat won’t be stored if dietary carb intake is zero. Higher GI carbs raise insulin levels to higher peaks, so a diet high in both sugar (or other high-GI carbs) and fat would in theory increase bodily fat stores by the greatest amount, and for preventing fat gain, the most important thing is to avoid both of these together.
Onto how ketogenic diets can help with fat loss:
I don’t generally reference Wikipedia but as you have done to someone else below, I have no issue with doing so here. Relevant article is here, relevant quote is:
“Circulating insulin also affects the synthesis of proteins in a wide variety of tissues. It is therefore an anabolic hormone, promoting the conversion of small molecules in the blood into large molecules inside the cells. Low insulin levels in the blood have the opposite effect by promoting widespread catabolism, especially of reserve body fat.”
Wait, what’s that? Low insulin levels promote widespread catabolism (aka breakdown) of reserve body fat? Well that suggests that a good strategy for losing body fat would be to lower your circulating insulin levels… but wait… if carb consumption promotes insulin release and low insulin levels promote widespread fat reserve breakdown, then carb consumption is actively hindering the breakdown of bodily fat due to its anabolic, protective effect on fat stores.
So again, via mechanisms I’ve provided for you, it can be seen your understanding is flawed. For weight gain, fat alone won’t do it any more than the same calorific intake of other macronutrients (protein slightly different due to energy requirements for storing it) unless in combination of carbs, DNP proves most excess carb energy isn’t lost as heat, it is the combination of fat and high-GI carbs that is most likely to increase bodily fat stores, and insulin, which is released following carbohydrate consumption, actively hinders the burning of bodily fat.
And finally, this quote from this paper is important:
“In conclusion, we found that a high carbohydrate intake was associated with an adverse impact on total mortality, whereas fats including saturated and unsaturated fatty acids were associated with lower risk of total mortality and stroke. We did not observe any detrimental effect of fat intakes on cardiovascular disease events.”
Stop demonising a dietary choice many thousands, possibly millions, of people have made and had success with because you haven’t done your research properly.