1. It depends on how tolerant you of of gluten but it's ok to eat if not allergic.
2.Yes you can, for example oranges are highly acidic but are packed with vitamin c. But that doesn't mean eat to much acidic foods for instance tomatoes are healthy but they are so acidic you can get blisters in your mouth if you eat to many.
3.An average woman needs to eat 2000 calories per day to maintain