I thought the Koran allows munchies if thought 'necessary'. I don't think it's a hard and fast (

) rule.
Found it. So pilots are exempt from fasting.

Might even apply to driving a 4X4.
Koran. Fasting Exemptions.
Children, disabled people not completely in control of their physical or mental capacities and people going through a difficult time in their lives (hard physical work, war,
travelling, latter months of pregnancy, nursing and menstruation) can be exempted from the rules (2:173, 6:45, 16:114–18). The explanation is that ‘‘God desires your well-being, not your discomfort’’ (2:185).