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So, I see these "bonus" IQ points (if real) as being a result of your child having access to healthy food and such, which is the ideal circumstance (of course, people don't even agree on what a healthy diet looks like.) The book should really say thing like "Feed your kid chicken nuggets all day and that might impact his health and brain functioning. Feed him more vegetables and fruits and he will be more likely to function optimally."

I also think this is the more accurate way to phrase it.