I have not put such a recipe together, but let us say I have a Soylent recipe that has a full nutritional profile but only 500 calories. All micros, Omegas, proteins, everything is there but a day’s batch is super-low calorie with the intention of forcing the body to burn fat to compensate.
The recipe would likely be both ketogenic and low-calorie, if for no other reason than there is a minimum protein and fat profile required to be healthy, while carbohydrates bring nothing unique to the table nutritionally (yes, most dietary carbs bring micros too, I am talking pure carb molecules here).
Such a diet would obviously cause severe fatigue, but what is your take on whether this would cause actual long-term harm to the body?
Is there a minimum number of calories a person must ingest? A maximum rate at which fat burns?
This article corroborates the common knowledge that starvation is bad primarily because of the malnutrition aspect. However, a super-low calorie Soylent would have full nutrition (minus the “having enough calories” aspect of course).
I could not find anything about the maximum rate of fat loss, other than articles saying there is a difference between weight loss and fat loss (which I already know) and that the fatter a person is, the easier it is to burn fat instead of lean body mass or water.