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In real life, it takes about 3 days of not eating to seriously impair one's reasoning.  Just ask any Prepper.

3 days in optimal conditions. You're crashlanded on an unknown planet, that by itself already puts on enough mental strain. Add to that the fear of raider or animal attack and the constant looming fate of dying alone on an empty planet, and suddenly getting a meltdown just by being a bit hungry doesn't sound that unbelievable.