Eli5: If pigs are 98% genetically similar to humans. Why do humans not get sick from eating pig meat like if humans cannibalized another human?

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First of all, 2% different is a HUGE difference. Just like how we share 50% of our DNA with plants, and 61% with fruit flies, most DNA is somewhat generic to life in general. Just like how if you add one extra atom to a molecule it becomes a whole different substance entirely, changing 2% of DNA can make huge differences.

Second of all, while it’s considered abhorrent and obviously murder is wrong, you wouldn’t necessarily get sick from eating human meat. A lot of the times that people from recent eras resort to cannibalism it’s because they’re starving. If you’re starving, it doesn’t matter what you eat, you’re going to get sick. Allied GIs accidentally killed a lot of Holocaust victims because when they were rescued, they were so emaciated that the natural human urge is to give them food immediately, and they didn’t know better to know someone who is that starved has to be very gradually reintroduced to food. So the popular misconception that human meat makes you sick comes primarily from confusing the sickness that comes with eating after starvation with sickness that came from the thing you ate in particular.

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