Aluminum foil leaches aluminum in the presence of salt, acid (some examples of acidic foods are tomatoes, lemon juice, vinegar, bell peppers) and who knows what else. Aluminum in the brain is associated with Alzheimer's disease (although the link is now being questioned by some) and also has some implications in breast cancer. No matter what studies have found, aluminum is a toxic heavy metal and it doesn't belong in your food and even less so in your body. Since you are putting all that effort into cooking healthy food, don't add aluminum to it.
Consider using parchment paper (unbleached is much better; chlorine bleaching leaves chemicals that are proven dioxins in the paper) instead and if you must wrap in foil, wrap in parchment first and make sure the foil doesn't come into contact with food. Worst-case scenario: find another recipe.
I get my parchment paper at a health food store, but I have also seen it at Whole Foods and at some grocery stores in the health food section.