If something is in your fridge and will go bad soon, put it in the freezer. So you can enjoy the food later. This saves food waste.
Cook in larger quantities and freeze them or split the food up for the week. This saves you on buying different ingredients for different meals. And if you freeze them you can still have variety. This saves money at the grocery store and waste from the landfill.
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Make a plan of what you will eat and make a list for grocery shopping. This saves you time, $$$ , and waste that you would otherwise throw away.