What may a person experience if blood glucose levels fall below normal?

When blood glucose levels fall below normal, a person may experience fatigue. Glucose is the primary source of energy for the body's cells, particularly the brain and muscles. When levels drop, the body has insufficient energy to function optimally. This leads to feelings of tiredness or fatigue because the body's energy reserves are depleted, which can affect both physical and mental performance.

In contrast to this, options like increased energy levels or improved concentration would be unlikely experiences during low blood glucose situations. Instead, concentration might actually decline due to reduced energy availability for brain function. Enhanced stamina is also not typically associated with lower blood glucose, as the body would struggle to sustain prolonged physical activity without adequate glucose levels. This context highlights the importance of maintaining stable blood glucose levels for overall energy and cognitive function.