How to tell when yogurt is bad?

In this brief guide, we are going to answer the question “how to tell when yogurt is bad” with an in-depth analysis of different ways to spot bad yogurt. Moreover, we are going to discuss the health implications of eating bad yogurt and whether or not you can consume the yogurt that is past its best-by date.

So without much ado, let’s dive in and figure out more about it.

How to tell when yogurt is bad?

You can tell whether or not yogurt is bad by doing its sensory evaluation. You should look for the appearance, texture, smell, and taste of the yogurt to reach a final verdict on whether or not you should eat it.


If you notice mold or organic growth on your yogurt (an uncommon occurrence), the best thing you can do is discard it.

As a result, if you see mold on your yogurt, you should throw the whole yogurt out right away since mycotoxins can spread throughout the yogurt and cause a variety of health concerns, including gut bacteria disruption and food poisoning if you ingest it. 

Furthermore, it can impair the immune system, making you more susceptible to infections and pathogenic microorganism attacks.


If your yogurt has gotten lumpy or curdled, or if a watery layer has formed on top of the remainder of the yogurt, it is past its prime period.


If you smell something sour or foul while sniffing your yogurt, it’s likely gone bad, and the best thing to do is to throw it out.


If the yogurt has passed the visual and olfactory tests, you can taste it. If you get a sharply sour flavor after taking a small sip of yogurt, the yogurt has likely gone bad.

What are the health implications of eating bad yogurt?

If you eat bad yogurt, you can get food poisoning from them that is characterized by diarrhea, nausea, vomiting, and abdominal pain. So it is better to discard such yogurt to save yourself from such a situation.

  1. Diarrhea is an indication of the body that a certain obnoxious agent has entered. So consumption of bad yogurt often causes diarrhea.
  1. Food poisoning after consuming bad yogurt is characterized by abdominal pain. Abdominal pain and cramps may likewise take place in the wake of devouring bad yogurt. 
  1. If you have consumed bad yogurt then you will experience nausea and vomiting which is the natural defense of the body to get rid of the unwanted harmful substance that has entered the body. Moreover, persistent vomiting can result in electrolyte imbalance in the body as well as it can lead to severe dehydration, dizziness, flushed skin, and weakness. It is advised to drink plenty of water to save the body from dehydration as severe dehydration can even lead to shock.
  1. Consuming bad yogurt will also raise your body temperature and you can experience fever which is the natural defense mechanism of your body and is the indicator that something is off with your body.
  1. Moreover, consuming bad yogurt can also give you headaches.

So if you have accidentally eaten yogurt with mold and now are suffering from vomiting or diarrhea, you should immediately look for medical help, moreover, you should drink a lot of water to compensate for the water loss that you are facing owing to vomiting and diarrhea.

Are there some populations that are more vulnerable to food poisoning than others?

No doubt consuming bad yogurt causes food sickness in the person who consumes it, yet some disadvantaged populations are more susceptible to food poisoning. They are

  1. Elderly adults, particularly those over the age of 65,
  1. Children under the age of five have a poor immune system compared to adults.
  1. Women who are pregnant
  1. Immunocompromised people have a weakened immune system and are already infected with diseases such as HIV, or who have just had a transplant or surgery.

As a result, such individuals should exercise greater caution when consuming food and should always check to see if the yogurt they are about to consume is okay or rotten.

Is yogurt safe to use after the best-before date?

The “best by” or “best before” date that is written on the pack of yogurt refers to the quality rather than safety so the yogurt doesn’t necessarily go bad immediately after the best before date. 

This date refers to the time during which you can enjoy the peak quality and flavor of yogurt but you can still use yogurt that is past this date as long as it was stored properly, there is no leakage in the pack and no signs of spoilage are present.

Other FAQs about Yogurt that you may be interested in.

Is Unsweetened Yogurt Keto Friendly?

Can I use plain Greek yogurt instead of ricotta?

Can you eat expired activia yogurt?

What can I use instead of yoghourt?


In this brief guide, we answered the question “how to tell when yogurt is bad” with an in-depth analysis of different ways to spot bad yogurt. Moreover, we discussed the health implications of eating bad yogurt and whether or not you can consume the yogurt that is past its best-by date.