Some types of bacteria can still grow in vacuum sealed food.
While vacuum sealing does help prevent some bacteria from growing in the vacuum sealed food, it does not eliminate all risk s of bacteria growing in the food.
The bacterial growth of the food is reduced by vacuum sealing the food by removing the oxygen in which many bacteria require to grow and survive.
However some bacteria like Listeria and Clostridium botulinum can grow even in the absence of oxygen so the bacteria listeria and Clostridium botulinum can still grow in food that is vacuum sealed.
So even though your food is vacuum sealed it can still go bad, especially if it's food that requires refrigeration or being frozen.
You can help keep the food from going bad and lasting longer by freezing the vacuum sealed food.
When frozen the vacuum sealed food often lasts for a year or longer depending on the food.
It's always best to eat the vacuum sealed food within a year or less but the vacuum sealed food can remain safe to eat well past these dates.
Vacuum sealing the food removes the air and oxygen that surrounds the food, which significantly reduces the oxygen available to the food and bacteria which requires the oxygen to survive and grow.
Although vacuum sealing food, while it does extend the shelf life of the food, it doesn't eliminate all bacteria growth and some bacteria are able to grow without oxygen or in low oxygen environments.
Clostridium botulinum is a dangerous pathogen bacteria that grows at room temperature in low acid moist foods, such as meats and vegetables in an anaerobic environment which is an environment without air.