There is a shelf life maintained for all foods, hence, next time you are buying something from the supermarket, don't forget to read the label on the food . Here is a list of food items that you shouldn't consume once they have crossed their expiry date. After the date of expiry the food might lose it's palatability.
Eggs: Do not have eggs that have been stored in your refrigerator for a long time. You could check whether the egg is fresh or not by following a simple technique:
Drop the egg in a glass of water, if it gets sink and turns on it's side then it might be fresh, if you notice that it floats in water then do not consume it. There are many ill health conditions such as abdominal pains, gas, diarrhea and even food poisoning that might occur if you have eggs that have passed the date of expiry.
Cheese: Many kids of cheeses, such as brie and feta can cause listeria food poisoning. How to find if your cheese has gone bad? You will find mild growing on it. If you see any trace of mold on your soft cheese don't just brush it off and eat it. If you want to increase the shelf life of this product, the best way to store it is wrapping it in an airtight jar and keeping it in the fridge.
Sea food: There are some sea foods available like shrimps that are susceptible to bacterial contamination. As and when you remove shrimps from sea, bacteria start building on it. The next time you serve shrimps, remember not to store it out of the fridge for a very long time.