Can you refreeze thawed vacuum packed food?
You can refreeze thawed vacuum food as long as it has not been open, if It has been open you can still reseal and refreeze it but you do run the risk of your food spoiling due to the introduction of bacteria into the food.
It isn't generally safe to refreeze raw food. This is especially true for chicken, which is contaminated with salmonella at scary-high rates. If the chicken has thawed, it isn't generally safe to refreeze it and eat it later. This is especially true if it is thawed in room-temperature water rather than being thawed in the refrigerator. Once thawed, the chicken should be cooked fairly quickly. Once cooked, it can then be frozen for later consumption.
Refreezing of veggies is not recommended since that will adversely affect the quality. From a food safety standpoint, it might be OK if the food did not get above 40°F, but that also depends how long the food has been thawed and how it got thawed out. If you have any doubts about the safety of the food, discard it.
According to the USDA, once food is thawed in the refrigerator, it is safe to refreeze it without cooking, although there may be a loss of quality due to the moisture lost through defrosting. After cooking raw foods which were previously frozen, it is safe to freeze the cooked foods. No, you should not refreeze meat once it has been thawed.
Refreezing thawed foods severely reduces the taste and quality of the food you refreeze. Not to mention any time spent in the thawed state increases the chance of bacterial growth that may not necessarily be eliminated during the refreeze process. It's better to cook the thawed item and then freeze it in the cooked form. Better safe.than sorry