The $11 Lab Marker That May Tell You More About Your Brain Than You Think

Most people have never heard of the anion gap, yet it can be calculated from a simple Comprehensive Metabolic Panel (CMP) that costs $11. No special testing is required. If you already have sodium, potassium, chloride, and CO₂ (bicarbonate) on your lab report, you can calculate your anion gap and gain valuable insight into your metabolism.

The laboratory reference range for the anion gap is typically 6–16 mEq/L, but from a functional perspective, the optimal range is often considered to be 7–12 mEq/L. An anion gap above 12 may suggest increased production of acids in the body and can sometimes be associated with poor energy metabolism, nutrient deficiencies, or metabolic stress.

Why does this matter?

One possible reason for an elevated anion gap is a deficiency of vitamin B1, also known as thiamine. Vitamin B1 is essential for converting carbohydrates into energy. Without enough B1, cells cannot efficiently produce ATP, the body’s energy currency. Instead, metabolic byproducts such as lactic acid can accumulate, potentially contributing to an elevated anion gap.

Vitamin B1 is especially important for the brain. Although the brain makes up only a small percentage of body weight, it consumes a large amount of the body’s energy every day. When thiamine levels are low, the brain may struggle to generate enough energy for optimal function.

Low B1 levels may contribute to brain fog, poor concentration, memory issues, mental fatigue, anxiety, irritability, low stress tolerance, and reduced cognitive performance. In children, inadequate B1 may affect attention, learning, memory, and overall cognitive development. In older adults, it may contribute to declining memory and mental sharpness.

This is why many practitioners consider thiamine one of the most important nutrients for lifelong brain health.

Why thiamine runs low

One challenge is that thiamine is a water-soluble vitamin. Unlike fat-soluble vitamins, it is not stored in large amounts in the body, meaning it must be consumed regularly through food or supplementation.

Alcohol is one of the biggest depleters of vitamin B1. Chronic alcohol consumption can reduce thiamine absorption, impair its activation, and increase the risk of deficiency. This is one reason severe thiamine deficiency is commonly seen in individuals with long-term alcohol use. High sugar intake, chronic stress, certain medications, digestive disorders, and inflammatory conditions may also increase the body’s need for thiamine.

Not every form reaches the brain

Another important fact is that not all forms of vitamin B1 are equally effective at reaching the brain. Standard thiamine hydrochloride (thiamine HCL) Another important fact is that not all forms of vitamin B1 reach the brain equally well. While thiamine hydrochloride (thiamine HCL) can help support overall thiamine status, sulbutiamine is a unique fat-soluble form that can cross the blood-brain barrier more effectively. Because of its ability to reach nervous tissue, sulbutiamine has been studied for its potential benefits in supporting cognitive function, mental energy, focus, memory, and neurological health.

Thiamine and neurodegenerative conditions

Researchers have become increasingly interested in thiamine’s role in neurodegenerative conditions, including Parkinson’s disease. Several studies and clinical observations have suggested that high-dose thiamine therapy may improve energy metabolism within brain cells and support motor and cognitive function in some Parkinson’s patients. While thiamine is not a cure for Parkinson’s disease, these findings highlight the critical role of cellular energy production in brain health.

Where to find it in food

Natural food sources of vitamin B1 include pork, which is one of the richest dietary sources. Other sources include sunflower seeds, nutritional yeast, legumes such as lentils and beans, green peas, trout, salmon, macadamia nuts, pistachios, asparagus, and whole grains. However, many people do not consume these foods consistently enough to maintain optimal thiamine intake, especially during periods of increased demand.

What a low anion gap can tell you

While most attention is given to an elevated anion gap, a low anion gap can also provide important information about overall health. A low anion gap may be seen when albumin levels are low, since albumin is one of the body’s major negatively charged proteins. It may also occur when certain proteins, such as IgG antibodies, are elevated, or when levels of positively charged minerals like calcium or magnesium are increased. If your anion gap falls below the optimal range of 7–12 mEq/L, it may be worth evaluating protein status, nutritional health, mineral balance, and immune system activity rather than simply dismissing the result as insignificant.

Why this matters for your family

If your goal is to help your children develop their full cognitive potential, or if you want your parents to maintain memory, focus, and mental sharpness as they age, paying attention to vitamin B1 status may be one of the simplest and most overlooked strategies.

The next time you order a Comprehensive Metabolic Panel, don’t just look at whether your labs are “normal.” Calculate the anion gap. An optimal value is generally between 7 and 12 mEq/L. If it is elevated above 12, especially when combined with fatigue, brain fog, poor concentration, or neurological symptoms, it may be worth taking a closer look at your metabolic health and vitamin B1 status.