Let’s try an analogy. Imagine this:
You have a coal furnace that give you energy to do stuff.
You have one guy who can shovel coal into it from a huge pile. Just ONE guy.
You have 10 guys who can shovel coal into it if it comes from the outside… fresh coal is so special that the big boss put a whole team on it.
Now. There’s a supervisor. This guy is nasty and he checks all the incoming coal… if he sees any gray chunks of coal (instead of black coal), he chains up the ONE guy who can shovel coal from the big pile… even if all the new coal is finished… even worse, the furnace can’t handle more than one chunk of gray coal a day… so he just tells those 10 guys to move ANY incoming coal into the pile for that day.
Now… let’s say you don’t have any new coal coming in. All you get is one guy shoveling coal from the big pile… the oven gets cold even if you have a mountain of stored coal… you’re just going to have low energy.
Now… let’s say you get some new coal and it’s the gray kind. The ONE guy gets chained up and can’t shovel any coal from the pile AND you only get one piece of gray coal for energy… so if any new coal comes in, it adds to the pile. Now you really have no energy…
Now… let’s say you get some new coal and it’s the black kind. The team can keep shoveling it in and the ONE guy can shovel in old coal from the pile too. Now the pile gets smaller and you have TONS of energy.
The black coal is fat
The gray coal is carbs
The ONE guy is how your body processes it’s own fat.
The 10 guys is your digestive system and the liver.
The huge pile is your body fat.
The new coal is food.
The furnace is your body’s Metabolism.
The supervisor is insulin.
The big boss … leave it up to you to decide.