Question

​which item is used to supply some of the fuel needed by the brain only after the body has been fasting for a while

Answer 1

The item is oxygen that supplies fuel

Answer 2

Sugar

Step-by-step explanation:

To handle all of its tasks, the brain consumes one-fifth of all the energy our bodies produce. And its main fuel is glucose (which we popularly call sugar). Every minute, this organ alone uses 5.6 milligrams of this nutrient for every 100 g of its weight.