Total Cholesterol 137 mg/dL: Is That Low?

Is Total Cholesterol 137 mg/dL Low, Normal, or High?

Total cholesterol 137 mg/dL is considered low based on standard clinical reference ranges. Most health organizations, including the American Heart Association and the National Heart, Lung, and Blood Institute, define desirable total cholesterol as under 200 mg/dL.

While being well below that threshold might sound like great news, a reading of 137 mg/dL is unusually low and may warrant a closer look. Your doctor will want to understand why your cholesterol is this low, especially if it has dropped significantly from previous readings.

Low total cholesterol is not automatically a problem, but it is worth exploring the full picture behind the number.

A total cholesterol level of 137 mg/dL indicates a result notably below the typical healthy reference range of 150-199 mg/dL, signaling a need for further clinical evaluation. While public health messaging often focuses on the risks associated with high cholesterol, a persistently low level like this warrants attention as it can signal underlying health conditions rather than being inherently beneficial.

At this specific level, common considerations include an overactive thyroid (hyperthyroidism), which can accelerate the breakdown of cholesterol, or certain forms of liver disease that impair the body's cholesterol production and processing.

Significant nutritional deficiencies, malabsorption issues, or recent severe, unexplained weight loss could also contribute to such a reading. To understand the cause, your doctor will likely recommend a repeat lipid panel to confirm the finding, followed by targeted diagnostic tests such as thyroid function tests, a comprehensive metabolic panel to assess liver health, and potentially a review of your diet and current medications.

What many patients don't realize is that unlike high cholesterol, which often has clear lifestyle interventions, addressing a low level like 137 mg/dL primarily involves diagnosing and treating the specific underlying cause, making a comprehensive medical investigation crucial rather than simply trying to increase intake of cholesterol-rich foods.

Hidden Risk of Total Cholesterol 137 mg/dL

A total cholesterol of 137 mg/dL often gets overlooked because most conversations about cholesterol focus on high readings. But very low cholesterol carries its own set of concerns that are less commonly discussed. Research from the National Institutes of Health has explored links between very low cholesterol and certain health outcomes that deserve attention.

While a total cholesterol level of 137 mg/dL is below the typically desired range, it can signal underlying issues that warrant attention. Extremely low cholesterol, particularly when it falls significantly below normal parameters, has been linked to an increased risk of certain neurological and psychiatric conditions, including depression, anxiety, and even impaired cognitive function, due to cholesterol's crucial role in cell membrane integrity and neurotransmitter synthesis.

Furthermore, this low level can sometimes indicate malabsorption issues or severe malnutrition, potentially leading to deficiencies in fat-soluble vitamins (A, D, E, K) and hindering overall cellular repair and immune function.

• Some studies have found associations between very low total cholesterol and increased risk of hemorrhagic stroke, though the connection is still being researched
• Cholesterol plays a critical role in hormone production, cell membrane structure, and vitamin D synthesis. Very low levels may affect these processes
• Low cholesterol can sometimes be a sign of an underlying condition such as hyperthyroidism, liver disease, malnutrition, or malabsorption issues
• Certain medications, chronic infections, or severe illness can push total cholesterol unusually low as a secondary effect
• Mental health research has explored potential links between very low cholesterol and mood changes, though findings remain mixed and no firm conclusions have been drawn

What Does a Total Cholesterol Level of 137 mg/dL Mean?

Total cholesterol is a combined measurement of several types of cholesterol and fats in your blood. The basic formula is: total cholesterol equals LDL cholesterol plus HDL cholesterol plus 20 percent of your triglycerides. So when you see a total cholesterol number, it reflects multiple components working together rather than a single type of fat.

A total cholesterol reading of 137 mg/dL is most plausibly explained by a combination of factors. Significant dietary changes, such as drastically reducing saturated and trans fats, or prolonged periods of very low-fat intake, can lower cholesterol levels.

Certain medical conditions, especially hyperthyroidism where the body metabolizes cholesterol too quickly, or advanced liver disease impacting cholesterol production, are strong contenders. Additionally, some medications, including certain statins or fibrates prescribed for other conditions, can aggressively lower cholesterol, potentially to this level, especially if dosage adjustments were recent.

Your body needs cholesterol. It is not simply a harmful substance. Cholesterol is essential for building and maintaining cell walls, producing hormones like estrogen and testosterone, creating bile acids that help you digest food, and synthesizing vitamin D. Every cell in your body uses cholesterol as part of its structure.

At 137 mg/dL, your total cholesterol is significantly below the desirable range of 150 to 199 mg/dL. For some people, this is simply their natural baseline driven by genetics, diet, and lifestyle.

For others, it could signal that something else is going on. Your doctor will want to look at each component of the lipid panel individually. For example, if your HDL (the protective cholesterol) is very low, even a low total number might not be as reassuring as it first appears.

It is also important to understand that cholesterol levels are just one factor in overall health. A reading of 137 mg/dL does not tell the full story on its own. Your doctor will interpret it alongside your other lab results, medical history, and lifestyle factors to form a complete assessment.

Lifestyle Changes for Total Cholesterol 137 mg/dL

If your total cholesterol is 137 mg/dL and your doctor has ruled out underlying conditions, the focus shifts to making sure your body is functioning well overall. Regular physical activity supports healthy cholesterol balance.

The American Heart Association recommends at least 150 minutes of moderate-intensity aerobic exercise per week, such as brisk walking, swimming, or cycling. Exercise tends to raise HDL cholesterol, which is especially important when total cholesterol is on the low side.

If your total cholesterol registers at 137 mg/dL, the next step is to schedule a follow-up test, ideally fasting, within two to three months to confirm the reading and assess trends.

Simultaneously, focus on a balanced diet rich in healthy fats, like those found in avocados and nuts, rather than eliminating all fats. Track your intake of nutrient-dense foods to rule out malabsorption.

If you are on cholesterol-lowering medication, discuss your current level with your prescribing physician to determine if dosage adjustments are needed. Consider a basic nutritional panel to check for vitamin deficiencies.

Maintaining a healthy weight is another key factor. Being significantly underweight can contribute to low cholesterol levels. If weight loss has been unintentional, it is worth mentioning to your healthcare provider. Sustainable body weight management supports stable cholesterol production.

Sleep quality also plays a role in cholesterol regulation. Research suggests that chronic sleep deprivation can alter lipid metabolism. Aiming for seven to nine hours of quality sleep per night supports your body's natural processes, including cholesterol production and balance.

Stress management matters as well. Chronic stress affects your hormonal balance, and since cholesterol is a building block for hormones, prolonged stress may influence your lipid profile in subtle ways. Finding consistent ways to manage stress, whether through exercise, spending time in nature, or simply resting, contributes to overall cardiovascular and metabolic health.