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Farmers and eaters around the country and the world are watching the November 6 election with a very important question at the forefront of their minds: Will California’s Proposition 37-requiring labeling of GMOs-pass?

Sixty-one countries already require such labeling. But here in the U.S., GMOs took off in the 1990s with no public debate, and today they’re in most processed foods, making Americans the world’s GMO guinea pigs.

We know it’s easy to get sunk by “information overload” and agribusiness advertising. So far the largest GMO maker, Monsanto, and other industry giants have plowed at least $35 million into killing Prop 37.

To help us think straight, we’ve prepared seven points-backed by peer-reviewed studies, a physicians’ 10-year investigation, and UN data-to consider and share with your friends. Here’s what they reveal:

1. GMOs have never undergone standard testing or regulation for human safety.

And now that they’re in 70 percent of processed foods, it’s extremely difficult for scientists to isolate their health risks.[i]

2. But we know that GMOs have proven harmful in animal studies.

A 2009 review of 19 studies found mammals fed GM corn or soy developed “liver and kidney problems” that could mark the “onset of chronic diseases.”[ii] Most were 90-day studies. In a new two-year study, rats fed genetically modified (GM) corn developed 2-3 times more tumors-some bigger than a quarter of their total body weight-and these tumors appeared much earlier than in rats fed non-GM corn. Among scientists, the study has its defenders and critics, but even the critics underscore that we need more long-term studies.