Which of the following can decrease overall G tolerance?

The correct answer is linked to the significant impact that nutrition and rest have on physiological performance and overall physical tolerance to G-forces. When individuals do not eat properly or do not get sufficient rest, their body may not operate at peak efficiency. This can lead to fatigue, decreased cognitive function, and reduced physical condition, all of which are essential factors in coping with G-forces.

Insufficient rest can impair decision-making and increase susceptibility to G-induced Loss of Consciousness (GLOC). Likewise, inadequate nutrition can lead to lower energy levels and compromised endurance during flight. Therefore, the combination of poor dietary habits and lack of rest can severely diminish overall G tolerance, making the body less capable of handling the physical stressors encountered during flight maneuvers.

On the other hand, getting enough sleep and eating a balanced diet are essential for maintaining physical and mental health, ultimately enhancing G tolerance. Overeating before flights can also lead to discomfort or sluggishness, but it does not have as direct an effect on G tolerance as the lack of proper nutrition and rest does.