Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

This article is part of the PlexusDx Education Hub — your resource for evidence-based guidance on brain & cognitive health. Browse all Brain & Cognitive Health education

Factors Affecting Short-Term Memory and Cognitive Health

You walk into a room and forget why. Someone says a phone number and it is gone before you can dial. Short-term memory is the workspace your brain uses to hold information for seconds to minutes, and when it falters, everyday life feels harder. Genetics shape roughly 40% of the variation in this ability, but they work alongside sleep, stress, and cardiovascular health. Understanding both sides gives you a clearer, more useful picture.

What Short-Term Memory Is — and Why It Slips

Short-term or working memory is handled largely by the prefrontal cortex and hippocampus. These regions hold and manipulate information — a grocery list, a set of directions, the thread of a conversation — while you use it. The system depends on dopamine signaling, healthy synaptic connections, and steady blood flow.

Occasional lapses are normal and often reflect divided attention rather than memory failure. Persistent difficulty, especially with a family pattern, is where genetics and modifiable risk factors both enter the conversation.

The Genes Behind Memory: BDNF, COMT, and APOE

Several well-studied genes influence how efficiently the memory system runs. Three stand out. BDNF governs a growth factor essential for building and maintaining synapses. COMT sets how quickly dopamine is cleared from the prefrontal cortex. APOE shapes lipid handling in the brain and is the most studied genetic factor in long-term cognitive aging.

None of these genes acts alone, and none is a verdict. They describe tendencies in the biological pathways behind attention, encoding, and recall.

BDNF Val66Met and How You Encode New Information

The BDNF Val66Met variant (rs6265) is one of the most researched memory-related polymorphisms. The Met allele reduces activity-dependent secretion of brain-derived neurotrophic factor, the protein that helps neurons form new connections in the hippocampus. Carriers show, on average, small differences in episodic memory performance and hippocampal function in imaging studies.

The effect is subtle and population-level, not a diagnosis. Importantly, BDNF expression responds strongly to behavior — aerobic exercise is one of the most reliable ways to raise it — which is why a genetic tendency is a starting point, not a fixed outcome.

COMT Val158Met and Working Memory Under Pressure

COMT (catechol-O-methyltransferase) breaks down dopamine in the prefrontal cortex, and the Val158Met variant (rs4680) changes how fast that happens. The Val version clears dopamine quickly; the Met version leaves more available. Researchers sometimes describe this as a "warrior/worrier" trade-off: Met carriers often show an edge in stable working-memory tasks, while Val carriers may handle acute stress more evenly.

This is a genuine trade-off, not a good-or-bad label. It helps explain why stress, caffeine, and sleep affect people's concentration differently.

Lifestyle Factors That Interact With Your Genes

Genetics set the terrain; daily habits shape the route. Sleep is when the hippocampus consolidates the day's information, and even one poor night measurably reduces recall. Regular aerobic exercise raises BDNF and supports blood flow to memory centers. Chronic stress elevates cortisol, which interferes with hippocampal signaling.

Nutrition, blood pressure, hearing health, and treatment of mood disorders all feed into cognitive performance. These levers matter regardless of which variants you carry, and they often matter most for people with a genetic tendency toward memory challenges.

What Genetic Insight Reveals About Your Cognitive Pathways

Knowing your variants will not diagnose a memory condition, and it will not tell you what to take. What it can do is map the pathways involved so your choices are informed rather than guessed. The Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights across the biological systems that touch cognition, including dopamine signaling and neurotrophic pathways where genes like BDNF and COMT operate.

That pathway-level view is context for a conversation with a qualified provider — a map of your biology, not a treatment plan. If memory changes are affecting your daily life, a clinical evaluation remains the right next step.

Frequently Asked Questions About Memory and Genetics

Is short-term memory loss always genetic?

No. Genetics explain roughly 40% of the variation in short-term memory, so most of the difference comes from other factors. Sleep quality, chronic stress, physical activity, blood pressure, mood disorders, and certain medications all influence recall, and many of these are modifiable at any age.

Does the BDNF Met allele mean I will develop memory problems?

No. The BDNF Val66Met variant is associated with small, average differences in memory performance across populations, not an individual guarantee. BDNF levels respond strongly to aerobic exercise and healthy sleep, so behavior can meaningfully influence the pathway regardless of which allele you carry.

Can lifestyle changes really improve memory?

Yes. Consistent sleep, regular aerobic exercise, stress management, and cardiovascular care are among the most reliable supports for cognitive function. They work by strengthening the same neurotrophic, dopamine, and vascular pathways that genes like BDNF and COMT help regulate, which is why habits shape outcomes so strongly.

When should I see a doctor about memory changes?

See a qualified healthcare provider if memory changes interfere with daily tasks, worsen over time, or worry you or your family. Sudden or progressive short-term memory loss can signal treatable conditions, so a professional evaluation is the appropriate step rather than self-interpreting a genetic result.

Curious how your own DNA shapes these pathways? Take the Precision Peptide Genetic Test to see the pathway-level insights that inform an evidence-based conversation with your provider.

This article is part of the PlexusDx Education Hub. Browse all Brain & Cognitive Health education

The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol.

Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.