Nausea can arise from a variety of causes, including disruptions in the body's equilibrium, such as dehydration, hormonal changes, or fluctuations in blood sugar levels. Lack of food or proper nutrition can trigger nausea due to low blood sugar or imbalances in electrolytes. Additionally, an empty stomach can lead to increased stomach acid, which irritates the stomach lining, potentially causing nausea. Furthermore, psychological factors like stress or anxiety can exacerbate feelings of nausea, compounding the effects of physical factors. Overall, the absence of sufficient sustenance or imbalance in bodily functions can disrupt the body's delicate equilibrium, leading to feelings of nausea.