Yes, the statement is true. Before lab drink water or eat something to avoid fainting or passing out in the lab room.
Fainting is caused by low blood pressure reducing the oxygen supply to brain.
Drinking water can also help reduces the chances of fainting as it carries essential nutrients which are vital for human body. Water molecules also carry oxygen necessary for body functioning.
Low salt foods can also be a cause of passing out or fainting.
Therefore, before attending lab or performing other physical activities drink enough water and eat some sweet or other nutrient rich food to regulate blood volume.
To put it simply, insufficient eating and inadequate drinking can cause loss of concentration or passing out.
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