Increased blood levels of the amino acid homocysteine have previously been associated with significantly higher occurrences of stroke and heart disease. Now, researchers have additionally found high levels of homocysteine to be associated with lower mental functioning in older individuals. Unfortunately, researchers state many physicians still do not routinely include homocysteine evaluations as part of their physical exams. So how might we fight high homocysteine levels naturally? Foods high in folate, vitamin B6, and vitamin B12, as well as supplementation with these vitamins has been shown to successfully lower homocysteine levels in the blood.