Originally Posted by
curlyque
Sorry sir, but you're misinformed. Your source doesn't understand the bio-chem either.
According to you, we're going to wither away and die without carbs. In fact, carbs are the one macro we can live entirely without and they certainly are not required to fuel 'current activities'.....
"
The brain cannot DIRECTLY use fat for energy. Once liver glycogen is depleted, without a backup energy source, humanity would’ve long disappeared in the eons of evolution.The backup is ketone bodies that the liver derives primarily from fatty acids in your diet or body fat. These ketones – β-hydroxybutyrate (BHB), acetoacetate and acetone – are released into the bloodstream, taken up by the brain and other organs, shuttled into the “energy factory” mitochondria and used up as fuel. "
There is a pecking order glucogen then ketones.... remember that even a way low bmi person still has 30 40 k calories of fat to convert to ketones.
"After several days of fasting, all cells in the body begin to break down protein. This releases amino acids into the bloodstream, which can be converted into glucose by the liver. Since much of our muscle mass is protein, this phenomenon is responsible for the wasting away of muscle mass seen in starvation."
Sure don't get where you're coming from. Who said anything about dying? But thank you for making my point more strongly. The last sentence in your post describes the muscle breakdown process when protein is not eaten, even though there is plenty of fat available in the body.