Most people assume that your IQ is inflexible, but this isn't true. Your brain must be maintained and developed, just like the rest of your body.

Here's something from ririanproject.com

Get Smart: Boost your IQ by 10 points

There are 27 points, all widely varying and very interesting. Here's an example:

23. Eat your meat

A meal that’s overloaded with carbohydrates can spell trouble for the brain. In a Harvard study, people who ate pure carbohydrates had up to twice the difficulty concentrating and performing mental tasks as those who’d eaten turkey, which is practically carb-free. This is due to the insulin that is dumped into your veins after the sugar is. Don’t eat white flour, sugar, potatoes, and other carbs before an important meeting.

24. Freshen up

Chewing gum improves memory and thinking, UK researchers have found. Chewing raises your heart rate, delivering more oxygen and glucose to the brain, while saliva triggers a surge of insulin, stimulating learning and memory receptors in the brain.