I'm with you, Jeanine, I think MSG and food additives should be avoided as much as possible. I'm not going to attempt to chime in either for or against MSG being the
most harmful, because that's far beyond my knowledge set, though I do have a couple other comments.
I wish I'd had your MSG reference sheet when I started having kids--it's excellent. I only recently learned that 'yeast extract' can be MSG and I began avoiding MSG when I was pregnant with my daughter over 24 years ago!
My body and mind are happiest with organic, pasture-raised, home-cooked food. At a minimum I feel "off," and I can even feel down-right sick after eating processed, prepared, deli or restaurant food - all of which seem to contain some kind of additive. Usually MSG, often nitrates or nitrites, as well as all that other icky stuff.
In thinking about solutions, there has been a correlation between poverty and obesity and/or food deserts. Which gets me thinking above and beyond plunking a Wal-Mart into a food desert area. Solutions more like more local farmers and local, fresh food. When "preaching to the choir" as you said, most of us on permies would love to patronize a local farmers market, but in the broader community, it's not always that simple.
I recently spoke with a farmers market manager who said a lot of the produce the farmers donated to the local food bank was going unused. She said the clients at the food bank didn't know what to do with it. Though when I put myself in the shoes of someone going to the food bank, I can imagine several (most?) might be too stressed/depressed/ill/busy to do anything with fresh produce. I think an awesome idea would be for community kitchens to prepare the produce--either simply wash and chop it, or make it into soups or other dishes--for some of the malnourished (I consider folks addicted to food-additive-type food to be malnourished) or under-served populations.
It's a major educational challenge to get folks converted to fresh, wholesome food (without additives)
and bring along our messed-up health and food systems. What could be some other creative solutions for change?