The natural fallacy has been coming up a lot lately. The fallacy is that marketers use the appeal to nature to imply that something is better because it is natural. The implication is that because it is natural, then this means that it is better for your. It may or may not be better for you, it is just to appeal to nature to imply it is better, is a fallacy. There are plenty of natural things that the natural that are bad for us, so you can see to appeal to nature is flawed. Arsenic is a natural substance and it is certainly not good for you. The reason it is coming up is that ‘natural running’ is being widely promoted as being good as its ‘natural’ which is the fallacy.