Lab-made cheese enzymes are widespread and unlabeled, with safety based on limited animal studies.
Original: Pfizer Got CAUGHT: You're Now Eating This Daily (CHECK YOUR LABELS)
TL;DR
The use of genetically engineered enzymes in cheese is well-documented, though long-term safety data and labeling transparency remain limited.
Quick Answer
Pfizer developed a genetically engineered enzyme called chymex in the 1980s by splicing a calf rennet gene into E. coli bacteria, which is now used to make most cheese in the U.S. This lab-made rennet, derived from genetically modified microorganisms, is present in about 90% of American cheese but is hidden from labels because it’s exempt from GMO labeling laws. Although the FDA approved it as 'generally recognized as safe' (GRAS) based on minimal animal testing, it has never undergone independent peer-reviewed safety studies. The ingredient is not listed as GMO because the final product contains only the purified enzyme, not the live GMO organism.
Claims (10)
1. Most cheese in the U.S. is made using enzymes from lab-altered microbes, but because the final enzyme is purified, it doesn’t count as a GMO and doesn’t need a GMO label.
2. We don’t have a standard test to prove that all traces of GMO germs or their genetic leftovers are completely gone from the purified enzymes used to make cheese in factories.
3. When mice are given ochratoxin A by mouth, it harms their liver and kidneys more the higher the dose, and the damage includes two types of cell death — one sudden and messy, the other controlled and programmed.
4. If a lab-made protein is almost exactly like one found in nature, experts might say it’s safe enough that it doesn’t need extra testing.
5. Some fungus used in making enzymes for industry can also make a harmful substance that might cause cancer in people.
6. Rennet cuts a protein on milk's tiny particles, making them clump together and turn into cheese curds.
7. For thousands of years, the key ingredient that turns milk into cheese has come from the stomachs of baby calves.
8. After making enzymes with GMO microbes, the cleanup process can remove all the GMOs, so the final product might not need a GMO label.
9. Scientists can make rennet, an enzyme used in cheese-making, by putting a cow gene into bacteria and growing those bacteria in big tanks to produce the enzyme.
10. They approved a lab-made enzyme used in cheese-making after only short animal tests, and those studies weren't shared in scientific journals for others to check.
Key Takeaways
- •Problem: Most cheese is made using an enzyme called rennet to turn milk into cheese, which traditionally came from the stomachs of young calves, but animal welfare concerns reduced its supply.
- •Core methods: Genetically engineered rennet made from E. coli bacteria and Aspergillus niger fungus, both modified to produce chymosin, the key cheese-making enzyme.
- •How methods work: Scientists take the gene from a calf that makes rennet, insert it into bacteria or fungus, grow it in big fermentation tanks, and then filter out the enzyme to use in cheese-making.
- •Expected outcomes: Most cheese in the U.S. now uses this lab-made rennet, but it’s not labeled as GMO because the final product is purified, so consumers don’t know they’re eating it.
- •Implementation timeframe: This process began in the late 1980s and became widespread within 10 years, with 90% of U.S. cheese using it by the 2000s.
Overview
The global cheese industry underwent a silent transformation in the late 1980s when Pfizer introduced chymex, a genetically engineered version of rennet—the enzyme essential for curdling milk into cheese. This shift was driven by a collapse in traditional rennet supply due to declining veal consumption following animal welfare scandals. Pfizer’s solution involved recombinant DNA technology to produce chymosin in bacteria, which the FDA approved via the GRAS pathway with minimal safety data. The result is a near-ubiquitous, unlabeled GMO-derived enzyme in cheese, raising concerns about transparency, regulatory oversight, and long-term health implications.
Key Terms
How to Apply
- 1.Step 1: When buying cheese, check the ingredient label for terms like 'animal rennet,' 'calf rennet,' or 'traditional rennet' to ensure you are purchasing cheese made with natural, non-GMO rennet.
- 2.Step 2: Avoid cheeses labeled with 'enzymes,' 'vegetarian rennet,' 'non-animal rennet,' or 'vegetable rennet,' as these almost always indicate the use of genetically engineered rennet derived from modified microorganisms.
- 3.Step 3: Opt for European cheeses with protected designation of origin (PDO) labels (e.g., Parmigiano-Reggiano), which legally require the use of traditional animal rennet and prohibit GMO-derived enzymes.
By following these steps, you can avoid consuming cheese made with genetically engineered rennet and ensure you are purchasing products that use traditional, non-GMO methods, supporting transparency and informed consumer choice.
Claims (10)
1. Most cheese in the U.S. is made using enzymes from lab-altered microbes, but because the final enzyme is purified, it doesn’t count as a GMO and doesn’t need a GMO label.
2. We don’t have a standard test to prove that all traces of GMO germs or their genetic leftovers are completely gone from the purified enzymes used to make cheese in factories.
3. When mice are given ochratoxin A by mouth, it harms their liver and kidneys more the higher the dose, and the damage includes two types of cell death — one sudden and messy, the other controlled and programmed.
4. If a lab-made protein is almost exactly like one found in nature, experts might say it’s safe enough that it doesn’t need extra testing.
5. Some fungus used in making enzymes for industry can also make a harmful substance that might cause cancer in people.
6. Rennet cuts a protein on milk's tiny particles, making them clump together and turn into cheese curds.
7. For thousands of years, the key ingredient that turns milk into cheese has come from the stomachs of baby calves.
8. After making enzymes with GMO microbes, the cleanup process can remove all the GMOs, so the final product might not need a GMO label.
9. Scientists can make rennet, an enzyme used in cheese-making, by putting a cow gene into bacteria and growing those bacteria in big tanks to produce the enzyme.
10. They approved a lab-made enzyme used in cheese-making after only short animal tests, and those studies weren't shared in scientific journals for others to check.
Related Content
Claims (10)
Scientists can make rennet, an enzyme used in cheese-making, by putting a cow gene into bacteria and growing those bacteria in big tanks to produce the enzyme.
Most cheese in the U.S. is made using enzymes from lab-altered microbes, but because the final enzyme is purified, it doesn’t count as a GMO and doesn’t need a GMO label.
Rennet cuts a protein on milk's tiny particles, making them clump together and turn into cheese curds.
For thousands of years, the key ingredient that turns milk into cheese has come from the stomachs of baby calves.
Some fungus used in making enzymes for industry can also make a harmful substance that might cause cancer in people.