Nutritionista
Someone who is highly interested in healthy eating, nutrition, natural living and wellness. This person might also be well-read on topics like vitamins, supplements, natural remedies, whole-body wellness, fitness, etc. Basically, someone who wants to live healthy through eating healthy.
My sister the "Nutritionista" - she shops at Whole Foods, is always drinking water, does yoga, takes lots of vitamins. Damn, her skin looks great for her age...