Assumes that something is good purely because it is natural; or equally that something is bad because it is not natural.
Person A: "We should be careful about drinking raw milk because it can contain harmful bacteria."
Person B: "But raw milk is natural, so it must be healthier than pasteurised milk!"
In this example, Person B is committing an appeal to nature fallacy by arguing that raw milk is better simply because it’s natural, ignoring the scientific evidence about the risks of harmful bacteria in unpasteurised milk.