You asked what I based my current opinions on, so I gave you the literature, and then you imply i'm wasting your time by citing things I haven't read - that isn't very nice of you.

If your going to read one book - Ketogenic - The science of therapeutic carbohydrate restriction in health. https://doi.org/10.1016/C2019-0-03604-7 Full Book is available on the normal book sharing websites. It doesn't say anything about herbs and spices, but it is far and away the most important and impactful book i own.