A Little-Known Factor That Can Increase Your Dementia Risk By 31%

We've been looking into dementia a lot lately—specifically, how to spot cognitive decline and what you can do to prevent it in the first place.

What to know about elevated homocysteine levels

Homocysteine is an amino acid that's heavily involved in a biological process called methylation. During methylation, the bioactive form of folate (5-MTHF) donates a methyl group to homocysteine so it can be converted into another amino acid, methionine.

When operating optimally, methylation promotes cardiovascular, neurological, and reproductive health, aids energy production, bolsters detoxification pathways, supports longevity, and more.

If bioactive folate isn't available to help convert homocysteine during the methylation cycle (i.e., due to an MTHFR gene variation or other reasons—such as poor diet, hormone imbalances, stress, or exposure to toxins), homocysteine levels can become too high.

Elevated homocysteine levels are linked to a higher risk of chronic inflammation, poor detoxification, cardiovascular disease, autoimmune conditions, and yes—dementia.

Homocysteine and dementia risk

Evidence suggests that elevated homocysteine levels are one of the causes of age-related decline and a dementia risk factor—but it's a modifiable risk, meaning our lifestyle habits can optimize our homocysteine levels and subsequently, reduce our dementia risk. 

In a 2018 Journal of Alzheimer's Disease review, researchers analyzed a number of meta-analyses and found that 12% to 31% of dementia cases could be prevented by lowering fasting total homocysteine (tHcy) levels. (And their science-backed suggestion for optimizing homocysteine levels is more simple than you might think.)

How to maintain healthy homocysteine levels

Scientists from the 2018 review found that elderly adults with cognitive impairment who increased their intake of methylation-critical B vitamins (i.e., folate, B6, and B12) saw a slowed rate of cognitive decline.

If you increase your B vitamin intake through supplementation, make sure to get bioactive B vitamins (e.g., methylated folate and B12) to ensure your body is able to use your B's, even if you're a part of the 50% that have an MTHFR gene variation.

The takeaway

Dementia cases are on the rise worldwide, but you don't have to become another statistic. By optimizing your homocysteine levels (ideally, with an increase in methylation-critical B vitamins), you can ensure your methylation cycle is operating optimally and reduce your risk of dementia by up to 31%.

If you are pregnant, breastfeeding, or taking medications, consult with your doctor before starting a supplement routine. It is always optimal to consult with a health care provider when considering what supplements are right for you.