I notice that in both countries where I lived the fridges are kept at 6 or 7 °C (43-45 °F). When it would be colder, people find their drinks to cold, when served straight out of fridge (especially in winter). Also a lower temperature would cost more energy.
What would be the best temperature for food storage. Would that be even lower? For storing meals, how much time longer would food stay good when the fridge would be colder?