You could do that, but it is dangerous to do so during an epidemic.
Having body fat helps you if you get very sick. Having low body fat means you are at a higher risk of death when your body has to fight off disease. Being very underweight increases your risk of catching diseases.
Of course, being excessively obese has other risks.
I am not a doctor (although anyone blindly following internet advice needs to be careful!)
There's a lot of space between obesity and underweight. What's being discussed here is use of excess stored body fat to extend one's food supply without impacting muscle mass or cognitive function. Perhaps I should have added the recommended minimum body fat levels but anyone getting near those levels would be unable to get an appreciable number of calories from stored bodyfat anyway, defeating the purpose of using body fat for food supply extension.
Having body fat helps you if you get very sick. Having low body fat means you are at a higher risk of death when your body has to fight off disease. Being very underweight increases your risk of catching diseases.
Of course, being excessively obese has other risks.
I am not a doctor (although anyone blindly following internet advice needs to be careful!)