On the first question, certainly food accessibility is a huge issue. In the context of fat taxes and other food taxes, if you're going to highlight certain foods for special taxation and not provide access to the substitutes that you want to encourage, you're not going to be able to accomplish anything. If you double the price of an unhealthy food item, that's a big price change, but if the alternatives don't exist in a remote community, then you still won't necessarily have the desirable substitutions that you want to see.
So even within the context of what many of the speakers have been talking to today, certainly the point you raise is a very valid and salient one for these communities.