You want to keep your brain functioning as well as possible for as long as possible. Some experts estimate that up to 50% of the average person's potential brain usage is 'dulled' by lack of critical vitamins and nutrients. Here are the vitamins to ensure your brain is running at its optimal level.

Fatty Acids - Omega-3 and Omega-6
Numerous studies have proven that your brain (which is 70% fat) requires fatty acids to build its connections and to run smoothly. You get Omega-3 from fish, especially salmon. You get Omega-6 from canola oil and walnut oil. There are also vitamin supplements available, but they should add TO, not be INSTEAD, of the natural oils.

Vitamin B in Eggs
As you know, there are many types of vitamin B. The specific kind found in eggs - called choline, has been found critical to brain functioning. Note this is NOT clorine, which is the chemical used in pools! Choline improves memory and reaction time, and helps to fight fatigue.

Antioxidants - Vitamins C and E
Free radicals can damage the brain just as they damage the heart and other systems. Free radicals love to attack fatty tissues, and the brain is a prime candidate. Be sure to get enough vitamin C (broccoli, brussels sprouts) and E (salmon, shrimp) in your diet through healthy food choices and vitamin supplements.
Vitamin E - Cholesterol and Brain Power

Iron
Iron is critical for proper brain and body health, especially in women. Up to 25% of female teenagers may be iron deficient, and a large percentage of adult women are as well. Iron can be supplied by red meat and egg yolks.

Zinc
Zinc is very important for the brain to function well. Zinc deficiencies also affects the nervous and immune systems. Zinc can be found in beef, pork and chicken. Up to 10% of children in the US have a Zinc deficiency.

Selenium
Selenium has been found to affect mood and brain functioning. Selenium is very high in brazil nuts, and is also found in tuna, cod, turkey and chicken.

Glucose
I mention this here because some anti-low-carb sites claim that CARBOHYDRATES are necessary for the brain to function. That is NOT true. Your brain needs around 50g of GLUCOSE which it can easily get from amino acids, i.e. proteins.

Fatty Acids help Fight Off Alzheimer's
Study links Overweight Women and Alzheimer's
Soy, Alzheimers and Brain Aging
Myth - Your Brain needs Carbohydrates to Function
Vitamin E - Cholesterol and Brain Power

500 Low Carb Recipes Buy from Amazon.com