This site is in Beta, and so a bit of self-examination is in order, and meta is the place for that. However, when I look at the list of meta questions, I see only one relating to broad scope definitiononly one relating to broad scope definition (until this one) with any activity in the last 3 months.
The result of those discussions regarding nutrition is that nutrition questions are very much on topic as long as there is some reasonable connection to health and fitness.