Kraft Seven Seas Viva Italian Fat Free Dressing

Ingredients: water, white wine vinegar, sugar, salt, contains less than 2%

of dried garlic, canola oil, garlic, vinegar, xanthan gum, dried onions,

dried tomatoes, dried red bell peppers, propylene glycol alginate, modified

food starch, spice, with potassium sorbate and calcium disodium EDTA as

preservatives, vitamin E acetate, sulfiting agents, yellow 5, yellow 6.

Questions:

How would the label be different if this were a "full fat" dressing?

What is the function of sulfiting agents?

What are the functions of xanthan gum and modified starch in this product?

Why was propylene glycol alginate used? Could you replace it with sodium alginate?