GMO technologies in food production have been adopted across the world-especially in North America, where 60-70% of grocery store items contain GM foods. Many plants have also been modified to resist herbicides so farmers can easily kill weeds without harming their crops. For example, scientists have inserted genes from a species of eel into Atlantic salmon to make them grow twice as fast, effectively doubling salmon production. Scientists add, subtract, or replace parts of the genetic code of food products for many reasons: increasing crop yields, improving nutritional values, even changing physical properties to make storing and shipping easier. Most GMOs are made by inserting a single gene from one organism into the code of another, or by changing existing genes in that organism. GM foods are products made from genetically modified organisms (GMOs)-plants and animals whose DNA has been modified by scientists. In the 21st century, some Jews have become concerned about whether genetically modified (GM) foods are kosher. However, since these books are complex and were written thousands of years ago, Jews who observe kashrut often have questions about the laws, including about eating foods that did not exist in biblical times. ![]() Most kosher laws are derived from the biblical books Leviticus and Deuteronomy. These laws define what is kosher, or fit to eat, and what is treif, or unfit. Some Jews follow dietary laws known as kashrut.
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