Two forms of fat that are vitally important for brain health are cholesterol and saturated fat.

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.

Fat is your friend. The brain thrives on a fat-rich, low-carbohydrate diet.

The best diet for overall health, and specifically for heart, brain, and cancer risk reduction, is a diet that's aggressively low in carbohydrates with an abundance of healthful fat, and this is the central theme of 'Grain Brain.'

It's important to remember that saturated fat is still the main dietary culprit that raises LDL cholesterol. When buying processed foods, look for 0g (grams) trans fat and minimal saturated fat. At this point, there is no recommended number to limit trans fat in the diet. It is simply recommended that you keep intake as low as possible.

Bad things happen. And the human brain is especially adept at making sure that we keep track of these events. This is an adaptive mechanism important for survival.