According to Osho, becoming harmonious with nature won’t turn you into an animal; you’re animal-like already in unconscious drives. Only humans can be out of tune and then consciously return; animals are in tune unconsciously. Conscious harmony transforms you upward - like a Buddha choosing simplicity - into innocence with awareness, not regression. Falling into unconsciousness (drink, drugs) is animal; conscious attunement awakens the divine.
Being natural won’t make you an animal; doing it with awareness makes you wise, while losing awareness makes you slip backward.