People who tell me they can eat ehatever they want and not gain, I tell that they are fortunate their desires aren't gluttonous. The difference between a beast and a best is not initially about what they eat, but what and how much they want to eat. If the desire is gluttonous, that's either a habit that needs checking or gentics that needs dicipline. Dicipline is either innate or not, and if it isn't, needs to be learned and practised. The alternative is planethood, with all the disgusting things that entails.