I know your body will adjust to caloric intake by a small amount or larger if you are actually dying, but I've always felt that "Starvation Mode" is just another case of fats hearing or reading medical facts/advice very selectively. It's like when a nutritionists recommends eating breakfast. It is so you don't overeat for lunch, but fats will just think they aren't eating enough for some reason. On top of that they'll have a fucking brunch for breakfast instead of a banana and some nuts or something