The notoriously dry aircraft cabin is caused in part by reduced atmospheric pressure at altitude. The higher you go the thinner the air.  Planes recycle the air through the engines but this doesn’t replace the moisture lost through respiration. The net effect is reduced moisture of the cabin air which contributes to dehydration.

• What you drink and eat on the plane has consequences.  The process of metabolizing your food  requires oxygen.
• Less  Oxygen In Cabin  = Increased Toxin Production = Increased Acidity = Severity of Jet Lag Symptoms.

Acidity and Dehydration reinforce one another. Caffeine, alcohol and soft drinks all have relatively low PH (acidity), this contributes to their dehydrating effect.

• Acidity of Caffeine – Picotech Lab test.

• Effects of Alcohol – Alcohol and Dehydration.

• Acidity of Soft Drinks – Picotech Lab test.