Most leftovers last four days in the fridge, but do you really remember whether that takeaway is from Friday or from Saturday? And here are the meatballs from yesterday — or wait, are they from the batch you made last week? Get in the habit of dating your food, and you can stop wondering.

It is a widely known fact that leftover pizza tastes better after a day or two in the fridge. The same is true of many popular takeaway dishes. But how long is too long? This infographic explains when ten popular takeaway dishes begin to enter the danger zone - along with warning signs to look out for.

You open up your cupboard, or take a peek in your camping cooking supplies, and you find a bunch of old tomato sauce packets. Are they still good to eat? How long do they last? Let's find out.

Dear Lifehacker, I frequently visit my local general store due to the convenience and lovely customer service. They have a discount bin which is populated with out-of-date items such as biscuits and chips. Usually, the products are a week or two old, but the other day they had things in the bin that expired over a month ago. Is there any kind of cut off for selling out of date goods?