The VIPs of the hour, tomatoes, over time, will crumble into themselves and start attracting insects so it's better to keep them in the fridge.
To make the butter easier to spread on bread, don't keep it out of the refrigerator. The oil in the butter will grow rancid if left at room temperature for too long.
Refrigerating eggs will minimize the risk of salmonella, which causes bacterial food poisoning. Take them out 30 minutes before cooking and you're good to go.
Keeping corn in the fridge helps to slow out the drying process. You can store them in a plastic bag.
Cheese can accumulate mold in hotter temperatures. They must be stored in the fridge and never in the freezer.
All the citrus fruits do best in the fridge because the cooler temperature prevents them from drying out.
They have acid that prevents bacteria that rots the food and hence, need to be refrigerated.
Nuts lose their health benefits if not refrigerated. Keeping them in the fridge makes them last longer.