Think about a bunch of fruits and plants or vegetables sitting in your bathroom. They would become moldy and disgusting in just a few days. Just think of how many people have hay fever and you will start to realize just how unfriendly natural ingredients can be. Food type ingredients increase the need for additional preservatives to decrease mold and bacteria contamination. Plant oils decompose faster than mineral oils and require higher concentrations of preservatives and fragrances.
Food can feed the bacteria in skin increasing the risk of breakouts.
Yeast or bacteria cultures in cosmetics can exacerbate Rosaceae and psoriasis. Natural ingredients are almost always synthetically treated so they can be blended into a cosmetic. There are a lot of natural ingredients but they are no more effective than the so-called synthetic ingredients. In fact, because natural ingredients have a larger range of limitations, synthetic ingredients are often safer and more reliable for the skin. Each has its pros and cons and it would be a delusion to assume otherwise.