When you live alone, buying food tends to be more expensive - than when you're two or more - because you have to buy smaller format of everything. Not only the price is higher for an equivalent quantity of food but especially it produces more waste.
On the other hand, if you buy larger amount, there is a risk that the food will go bad before you have time to eat it.
One option is to buy - rather - large amount and to freeze what you're not going to eat right away.
I do that especially for grated cheese: I saved 2-3 bags so I can divide my 500 g cheese and can eat it little by little.
Same thing with bread, not that I don't know when i'm going to eat it (every morning, toasted) but it would get dry before I even have time to finish the whole loaf.
This trick works pretty with anything you need to warm up anyway, and you don't even need to use the micro wave.
One onion if often too much for me for one meal (but, hey, you can't buy smaller amount) so I freeze the second half for later (or right now, 3 other halves, there was a discount).
This is also a way to save time without going through the junk food/prepared meal option. Same thing when you cook: prepare more, you won't need to cook next time/buy your next lunch.
In a word, you save time, money and ressources.
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