Recap
Improves COMT Gene Function: Vitamin C, magnesium, and copper (copper should
not be too low or too high).
Decreases Gene Function: Chronic stress, sugar, proton pump inhibitors, aspartame,
low magnesium levels, low vitamin C levels, low and high copper levels,
constipation, xenoestrogens, high homocysteine levels, high SAH levels, estrogen-
based medications and mercury toxicity.
DOPAMINE, ADRENALINE AND ESTROGEN-COMT
Research: COMT (catecholamine methyltransferase) shares a pathway with MAO-A and is the gene for dopamine, estrogen,
adrenaline and catecholamine metabolism. This pathway requires magnesium, vitamin C and copper as co-factors.
While the homozygous genotype for COMT V158M is associated with slower enzymatic function and naturally higher dopamine
and adrenaline levels, the wild-type COMT V158M gene (GG rs4633) is associated with faster enzymatic function, leading to
lower prefrontal dopamine, adrenaline and norepinephrine levels.
The benefits to the GG genotype may be a better response to high-pressure situations and the ability to be more emotionally
resilient and calm in a crisis. Those with the GG genotype may even thrive more in response to certain stressors and have
enhanced cognitive performance due to the elevation of dopamine and adrenaline to more normal levels.
The downside of the GG genotype is that it can affect executive function and problem-solving abilities compared to the AC and
AA genotypes of COMT V158M if dopamine remains low. Individuals who had the GG genotype of COMT and variants in
ANKK1 showed the lowest cognitive performance, however, both genes can be improved by increasing catecholamine intake,
meditation, balanced blood sugar, vitamin D, omega-3 fatty acids, fiber, high intensity exercise and lower media exposure.
Several studies have found that the COMT V158M GG individuals perform better than those with the AA allele on tasks
demanding cognitive flexibility, while individuals with the AA allele are better at tasks demanding focused attention. The
“inverted U” hypothesis suggests that when dopamine levels are either too high or too low, cognition is adversely affected.
In a study of Swedish men and women with depression, the GG genotype also appears deleterious with a three-fold increased
risk of later cardiovascular disease compared to those non-depressed carrying the GG genotype. The risk was higher in women
than in men. A 2016 meta-analysis found that for each cup of coffee, depression was reduced by 8%, being most significant
when the caffeine consumption was above 68mg/day and below 509mg/day. Due to coffee and caffeine's effect on COMT
and dopamine, this genotype with depression may benefit from increased coffee intake. The CYP1A2 gene for caffeine
metabolism should also be reviewed.
Small studies have shown that Caucasian carriers of at least one G allele showed a greater effect for social facilitation and
cooperativeness (working together in a group) than the AA homozygous group for COMT V158M. In women, the GG genotype
was considered to be more helpful and empathetic, socially tolerant, compassionate, and potentially more altruistic.
The GG genotype has also been found to have a higher threshold of pain. In a 2019 study, twenty minutes following exposure
to cold stress, subjects with the GG genotype showed a lower biochemical stress response relative to the homozygous AA
carriers.
While studies have had mixed results with ADHD and COMT genotypes, research has shown that amphetamines (Adderall)
enhanced prefrontal cortex function and improved working memory efficiency for the GG (high COMT activity) subjects, while
amphetamine produced adverse effects under high working memory load conditions for homozygous AA (low activity) subjects.
A subtype of ADHD is characterized by low dopamine levels.
There are dietary strategies that naturally slow down the COMT enzyme. Catecholamines (coffee, black tea, green tea, red
wine, chocolate, citrus, bananas, berries, and vanilla) all help slow down COMT, increasing dopamine and adrenaline. For breast
cancer prevention, green tea has been found to be beneficial in the AG and AA genotype, but not the GG genotype. This is due
to the AG and AA genotype retaining polyphenols the longest. Therefore, the GG genotype may need a higher intake of green
tea to achieve the same benefit.
Coffee can increase dopamine concentration, signaling, and receptor availability, proving very beneficial for those in a lower
dopamine state. Research has also found that coffee drinkers have up to a 60% lower risk of Parkinson’s disease likely due to
increased dopamine signaling in the brain from caffeine.
Those with lower dopamine and adrenaline levels are also going to do better with exercise that involves an element of risk
like surfing, snowboarding, mountain biking, skiing, and athletic competitions to modulate healthy dopamine and adrenaline
concentrations. This requirement may be more relevant in men due to higher estrogen levels in women slowing down COMT.
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