One speaks of 'orthostatic hypotension' wann if, for example, you get up quickly out of nowhere and your blood doesn't keep up with this rapid pace and thus a experience dizziness feeling, fainting and/or becoming lightheaded. Not consuming food or drink for a certain period of time can increase the risk of orthostatic hypotension. Not drinking enough fluids can lead to dehydration, which in turn can lead to a decrease in blood volume and lower blood pressure. During water fasting, the body may also experience a change in electrolyte balance, particularly a decrease in sodium levels. This may also contribute to an increased risk of orthostatic hypotension, as sodium plays an important role in maintaining fluid balance and regulating blood pressure.