This Simple Diet Linked To Higher IQ

You mean I could become even smarter if I became a vegetarian? Or did I have to do this by age 30?
http://www.spring.org.uk/2016/10/higher-iq-diet.php?omhide=true

The reason people with a higher IQ also tend to be healthier could be down to their diet.

People with a higher IQ are more likely to be vegetarian, psychological research finds.

In fact, vegetarians could be up to 10% more intelligent than red meat eaters, according to some studies.
A higher IQ is also seen among those who describe themselves as vegetarian, but also eat chicken and fish.
The conclusion comes from a survey of 8,170 men and women whose IQ was tested when they were 10-years-old.
By age 30, 4.5% had become vegetarian, of these 2.5% were vegan and 33.6% said they were vegetarian, but still ate chicken and/or fish.
People with higher IQs at age 10, the analysis showed, were more likely to be vegetarians at age 30.
There was no difference between stricter vegetarians (ovo-lacto vegetarians) and those who ate some chicken and/or fish as well.
The findings could help to explain why more intelligent people are also healthier, since a vegetarian diet is better for the heart and for maintaining a healthy body mass.