work cannot be done for a long time without having food.why?

Dear student

Human body requires the nutrients in food to survive. It uses protein, carbohydrates, and fats, as well as vitamins and minerals, to renew cells and fuel vital bodily processes.
 
When body doesn't get food, it starts to use its own tissue as fuel, it can do this for long time but person becomes very weak and if person persists to remain without food for much long time, he may die as his own body cells would be consumed in doing work. 
So body can remain without food for long time as it starts consuming it's own tissues but it can be very dangerous for health of person even it may lead to death

Regards

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