The epigenome comprises chemical tags that sit on our DNA’s double helix, controlling which genes are turned on or off. Dr. Jason Schuster explains that while 99.9% of our DNA sequence is identical across humans, it is these epigenetic modifications that drive most of our phenotypic differences and health outcomes.
Definition & Structure
According to Dr. Schuster, the epigenome is a layer "above" the genome – it does not change the genetic code itself but adds or removes small molecules on the DNA helix. These tags determine whether a gene is accessible for transcription, effectively deciding if a trait like eye color will be expressed.
- 99.9% of DNA sequence is shared among individuals
- Epigenetic tags modulate gene expression without altering the code
- Variations in height, eye color, IQ, etc., stem from expression differences
Molecular Switches
Dr. Schuster describes methylation as a primary epigenetic mechanism: molecules attach to DNA and either promote or block gene reading. He notes that many people cannot properly methylate synthetic folic acid, leading to a functional deficiency that can impair health.
- Methyl groups act as on/off switches for genes
- Unmetabolized folic acid in fortified grains can act as a toxin for up to 50% of the U.S. population
- Proper nutrition and supplementation can optimize methylation patterns
Health Impact
When the epigenome is favorable, it supports longevity genes, telomere maintenance, and balanced mTOR signaling—factors Dr. Schuster links to improved cellular health span and overall resilience. Conversely, a dysregulated epigenome can compromise cell replication and accelerate physical and mental decline.
- Enhanced telomere protection improves cellular lifespan
- Balanced mTOR activity supports metabolic health
- Positive epigenetic marks can be inherited across generations
Potential Pitfalls
Dr. Schuster warns that many mainstream foods contain synthetic folic acid, which the body may fail to methylate, effectively poisoning those with the common genetic variant. He emphasizes the need for organic sources or methylated forms to avoid this epigenetic disruption.
“The epigenome is a level above the DNA, and it can be more important than our actual genome itself.”— Dr. Jason Schuster
Dr. Schuster's short takes on this topic — tap to play.
The full nutrition & epigenetics coursework
Dr. Schuster's accredited courses on epigenetics, methylation, and nutrition — the mechanisms on this page, in full.