If you label them make sure you put the date on it as well.. I should start that. It would be easier than the sniff and "is this still good" test I do on leftovers I find in the back of the fridge.
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One of the things that my mom did was make "meatloaf" when we had a ton of leftovers.. Any leftover that would go good in meatloaf got thrown in. We had some interesting meatloaves. Its nice when you have just a little of something that really isn't enough to even make one serving but you don't want to throw it away. I had some cooked up ground beef and BBQ sauce and some diced carrots I threw in a meatloaf yesterday. Also, leftover nights is a good thing. Once every week (if you have enough leftovers) have everyone just pick a leftover in the fridge for their dinner.
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My husband also loves leftovers for his lunches. I just put it in a container, put the container, a couple of cookies and some silverware in a lunch box and put it in the fridge. Win Win situation, food gets eaten and hes not tempted to go buy something. Hes co-workers get a little jealous though, Ive had many requests for dinner invites over the last few years 
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Another thing you could do if the meal wasn't particularly liked by your family is see if someone else might like it. My MIL is always making to much and offering me some of their leftovers. We had eggplant Parmesan the other day that was soooo good but FIL and her didn't like it. Again win win, they didn't waste the food or force themselves to eat something they didn't like and I got a meal that my girls cleaned their plates and asked for more.I do this alot with bread Ive made. I make french bread a lot and if I don't want to freeze it (the recipe I use makes 3 loaves, we use 1/2 loaf each meal when we eat it) I will give it to people I know will use it.
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I really don't like waste, especially in the form of wasting food. If I can't use it I can always find someone who can/will.