Saturated fat is a fundamental building block for brain cells. It's certainly interesting to consider that one of the richest sources of saturated fat in nature is human breast milk.
Our ancestors relied upon their advanced brains to survive during times of food shortage, and fortunately, the human brain is able to utilize body fat as an extremely efficient fuel to sustain function when glucose-providing food is unavailable.
Increase your consumption of healthful fats like extra virgin olive oil, avocado, grass-fed beef, wild fish, coconut oil, nuts and seeds. At the same time, keep in mind that modified fats like hydrogenated or trans fats are the worst choices for brain health.