Google thought that your services are either

https://checkout.google.com/seller/content_policies.html

a) Miracle cure (Unsubstantiated cures, remedies or other items marketed as quick health fixes)

I can see how your sales later reads like a Miracle cure. (maybe you even tried to sell your Vegan book through google?)

b) Adult goods and services (Pornography and other sexually suggestive materials (including literature, imagery and other media); escort or prostitution services)

Some people might see a book about getting into bed with woman as adult content.