I love living alone because of how empty my refrigerator is: so empty that I haven't replaced the burnt-out bulb in a year and a half. No housemates clogging the shelves.
My view is: only buy large volumes of things that don't spoil quickly (olive oil, eggs, peanut butter, mayo, potatoes, pasta, canned beans/canned tomatoes, etc.) For everything else, go to the store every 1-3 days.
This works well for me, because I live upstairs from a great little grocery. Their produce is wonderful, but their dried/canned/preserved foods tend to be expensive. Regardless, if you're commuting, work it into the trip home. When you're shopping that frequently, you don't have to buy as much and can generally fit a single trip's worth of groceries on top of whatever else is in your bag.
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