From an attention-getting perspective, the issue I see with the current category descriptions is that they tell your customers things they already know. Chefs and food service professionals know what bulk items are, and know that "Bread is a food made of flour, water, and yeast or another leavening agent." By "preaching to the converted" you've lost a valuable marketing opportunity--the "natural, organic and environmentally friendly" aspects of your business have been upstaged by things your customers already take for granted.
As I see it, telling your customers that you sell natural, environmentally friendly products is not enough. It's equally important for you to subtly let your customers know that you provide them with a kind of vetting service. The relevant question here: to what extent does your business provide customers with an easy means of sourcing products in line with their ethics? To what extent could your business subtly advertise itself as doing that?
The extent to which my writing can convey that message is up to you. If you are interested in that approach, I would need to spend an hour interviewing 1-2 people within the company (1 person who has knowledge of the company's vision and sourcing practices would be sufficient). Armed with information about WHY you sell the products you do, I could write things like, "Our dairy products have been sourced from x and y, both of which belong to z standards organization (or 1 to a cooperative, etc.).
Cheers, Ben