Last week, Xiao Lu's mom sent her a box full of hometown fruits, chicken, and duck meat, hoping to add some variety to Xiao Lu's meals instead of relying on unhealthy takeout. But when Xiao Lu lugged the huge box home, she was stumped. The fruits were manageable, but what to do with the whole chickens and ducks?Working alone during the day, she ate at the office and only cooked dinner at home. With so much meat, cooking it meal by meal, how long would it take to finish it all?
Although she had a refrigerator, online sources advised against freezing meat for too long, as prolonged freezing could lead to bacterial growth, carcinogens, and other health risks.
Refrigerators aren't safes—food storage has limits.
We must understand that refrigerators aren't foolproof. While they preserve food, they don't offer permanent storage. Opening and closing the door causes temperature fluctuations that affect freshness.
Take meat as an example: during purchase, it's susceptible to bacterial contamination. When brought home and stored in the refrigerator, the fats and proteins in meat undergo oxidation, producing fatty oxidation substances that cause nutrient loss and deteriorate texture.
Repeatedly thawing meat poses three major health risks.
Studies show that meat thawed 3-4 times can see its total bacterial count surge by 15 times.Therefore, don't assume that leftover meat can be frozen again after a meal and thawed for later consumption. This practice not only fails to preserve freshness but may also harm your health.
1. Accelerates Aging
First, repeated thawing causes nutrient loss. During freezing, residual water in meat repeatedly freezes and thaws.The larger the ice crystals, the more severely the meat's tissue structure is compressed. This ultimately punctures food cells, causing nutrient loss and deteriorating meat quality.
Excessive consumption of such frozen meat can easily produce fat oxidation byproducts that accelerate human aging.
2. Increases Cancer Risk
Repeatedly thawing meat allows bacteria to multiply rapidly. While low refrigerator temperatures inhibit bacterial growth, they do not eliminate it. Once meat leaves the cold environment and warms up, bacteria proliferate massively. If meat is repeatedly taken out and put back in, the rate of bacterial growth becomes evident.
Furthermore, thawing meat after removal causes rapid temperature increases that damage tissue cells. This leads to leakage of proteins and water, promoting bacterial growth and producing harmful decomposition products like amines and ketones. Consuming such meat may cause food poisoning, manifesting as gastrointestinal discomfort including nausea, vomiting, and diarrhea.
Long-term consumption of expired frozen meat can also weaken immunity and even increase cancer risk.
3. Nutrient Loss
Finally, repeated thawing degrades meat texture. The hydration layer around protein molecules weakens with each freeze-thaw cycle, resulting in tough, flavorless meat—literally worse than not eating it at all.
Warning: Overly Frozen Meat Becomes "Zombie Meat"
Experts caution against freezing meat for extended periods. For best quality, consume within one month. Meat stored longer than six months risks becoming "zombie meat."
"Zombie meat" refers to expired meat that has been frozen excessively long, allowing bacteria to proliferate and posing health risks when consumed.
Generally, fresh red meats like pork, lamb, and beef have a shelf life of 10-12 months, with lean cuts lasting longer than fatty ones. Poultry such as chicken, duck, and goose have a slightly shorter shelf life of about 8-10 months. Seafood like shrimp and crab have the shortest shelf life, lasting only about 4 months.
While these freezing durations seem lengthy, they represent extreme storage limits not generally recommended. Remember the hazards mentioned earlier—it's best to buy and consume meat promptly, estimating portions you can finish to avoid wasting leftovers in the freezer.
However, meat is often expensive, and some unscrupulous merchants may try to profit by selling overfrozen "zombie meat." Here's how to spot it:
1. Purchase meat only from reputable, large supermarkets or farmers' markets. Avoid cheap meat deals.
2. Avoid meat with an off smell or sticky texture, as it may have spoiled.
3. Visually, if meat appears dull and lacks luster, it likely sat too long and is generally not recommended.
Life Hack: Thaw Frozen Meat in 5 Minutes
Finally, here's a handy tip: When thawing large cuts of meat, excessive ice buildup often requires lengthy waiting. Some use hot water, which can compromise texture. Instead, try this quick method: submerge the meat in cold water, sprinkle with a pinch of salt, and let it soak for about 5 minutes—it will be mostly thawed.
Refrigerators have brought convenience to every household, allowing us to store extra or leftover food for freshness and easy access. However, refrigerators aren't magical—food has specific shelf lives, and freezing doesn't preserve freshness indefinitely. So, make sure to remind your family that items in the fridge shouldn't be stored too long, as consuming them could affect your health.
References:
[1] "How Long Can Frozen Meat Last in the Refrigerator? A Clear Chart Summary". Life Times. 2018-04-26.
[2] "Does Repeated Thawing Increase Bacteria in Frozen Meat by 15 Times? Does Long-Term Freezing Create 'Zombie Meat'? Let's Set the Record Straight Today." Science China. June 5, 2020.
[3] "Freeze Meat Quickly, Thaw Slowly: Essential Techniques to Remember." Life Times. February 11, 2019.