Amino acids—organic compounds that help the body make proteins—are essential to human metabolism. Though amino acids don’t receive nearly as much attention in nutrition discussions as vitamins and minerals, you need them just as much to stay healthy—particularly for brain function. Let’s take a closer look at some of the most important amino acids in terms of maintaining mental acuity:
- Arginine. This amino acid is partially converted into a chemical known asspermine, which is believed to help the brain process memory. Low levels of spermine often signal age-related memory loss.
- Choline. The brain uses this amino acid to manufacture a memory-related neurotransmitter called acetylcholine. Older people are encouraged to take choline supplements because as we age we tend to produce less acetyl- choline, putting us at greater risk of memory impairment. Dietary sources of choline include cabbage, cauliflower, eggs, peanuts, and lecithin.
- Glutamine. This amino acid is a precursor of a calming neurotransmitter known as GABA (gamma-aminobutyric acid). It also helps improve clarity of thought and boosts alertness by assisting in the manufacture of glutamic acid, a compound known for its ability to eliminate metabolic wastes in the brain.
- Methionine. Like glutamine, this amino acid helps cleanse the brain of dam- aging metabolic wastes. It is an effective antioxidant and helps reduce brain levels of dangerous heavy metals such as mercury.