Cells have to produce their own fuel in small compartments called mitochondria that generate cellular fuel with the breakdown of glucose and production of carbon dioxide that is then passed out of the tissues.
The process is called the Krebs Cycle. The final end product is adenosine triphosphate (ATP). This is the fuel of life. Please click:
The Citric Acid (Krebs) Cycle: Products and Steps - Video ..
The gut is slowly destroyed as the epithelial layer is broken down. There is no longer the passage of nutrients through the gut lining to the blood vessels on the way to the tissues and cells. The water-salt balance is damaged which brings working body processes to a halt.
Living tissue slowly becomes dead meat. The sufferer dies of starvation, suffocation, infection and dehydration. A reprieve can come with antiretroviral (ARV) medication but the Krebs Cycle can not be allowed to decline past the point of no return.
But a loss of water through the small intestine can also cause collateral damage to body organs including the brain, nervous system, liver and kidneys.
There reaches a point at which the sufferer can only be treated with a drip at the hospital to artificially insert water, salts and sugars.