Battree is a device use to store electrical potential, battery is a crime and an adjective ;)

It's a stretch to subject an unborn baby suspended in the fluids of the womb and a person living outside the womb normally to the same classification. This question answers itself, specifically at "babies in the womb"

So yes and no to it being that simple. For understandings sake, you can say that it is that simple, you burn the food, some energy is lost from the food as it turns into energy/matter in other forms(matter and energy can be converted to each other), the total amount of energy never changes, only where and how its stored. On the other end of the complexity spectrum, what actually is happening when you burn that food, is alot more meticulous, for anyone's liking, even the people who study things like molecular physics lol.

"Energy loss" does not exist. The law of conservation of energy states that energy cannot be created or destroyed only converted from one form to another. So when you burn the food, some of the chemical energy stored in the food item is converted into the byproducts of the burning, like smoke and heat etc.