Also, what does it matter that there’s more energy per gram of fat versus carrots? Your body knows when it has enough energy* and you stop being hungry. Consider 19th century explorers eating pemmican (made of 50/50 fat and dried meat - they avoided the versions with berries and sugar) they would eat tiny amounts - less than the meat in a McDonald’s cheeseburger as a days food, despite the fact it hardly filled their stomachs

*Though on high carb your body will say it wants more all of it, since carbs are only available briefly in summer in history so you want to eat as much as you can. As a bonus, carbs from plants are half fructose and the fructose is turned to fat directly. You want to save some summer energy for winter