Your Cholesterol Can Be Low, But Your Heart May Still Be at Risk
A 2026 study of nearly 35,000 adults whose LDL cholesterol was below 100 mg/dL found that two other blood markers, lipoprotein(a) and C‑reactive protein, were linked to a higher risk of heart attack.
Many people associate heart attacks with high cholesterol. While elevated LDL cholesterol is an established cardiovascular risk factor, having a relatively low LDL reading does not guarantee protection against heart disease.
Recent research has highlighted additional factors that may help explain why some individuals experience heart attacks despite relatively favorable LDL cholesterol levels.
The real question is not whether cholesterol matters.
It is whether cholesterol alone tells us everything we need to know.
01 / The basicsWhat is LDL cholesterol?
Cholesterol does not travel through the blood on its own. It rides inside particles called lipoproteins. LDL (low-density lipoprotein) particles carry cholesterol to cells around the body, which use it to build cell walls and make hormones.
Problems start when there are more LDL particles in the blood than the body needs. Some of them pass into the inner wall of an artery and get stuck there. The body treats them as a threat and sends immune cells, which swallow the trapped cholesterol. Over years, this mix of cholesterol, immune cells, and scar-like tissue builds up into plaque. That slow process is called atherosclerosis.
1. Open arteryLDL particles travel in the blood alongside red blood cells. 2. Particles get trappedExcess LDL enters the artery wall. Immune cells arrive and inflammation begins. 3. Plaque builds upOver years, plaque can narrow the artery. If a plaque breaks open, a clot can form and block blood flow.
What is atherosclerosis?
Atherosclerosis is the slow buildup of plaque inside artery walls. It usually develops silently over decades. When it affects the arteries that feed the heart, it is called coronary artery disease.
Most heart attacks happen when a plaque cracks or tears. The body forms a blood clot at that spot, and the clot can suddenly block blood flow to part of the heart muscle.
Lowering high LDL works
Genetic studies, long-term population studies, and randomized trials all point the same way: LDL is a cause of atherosclerotic heart disease, and lowering elevated LDL reduces heart attacks and strokes. In a large analysis of randomized trials, the benefit grew with the amount LDL was lowered.
Nothing in this article suggests LDL is harmless or that lowering it is unnecessary. Keeping LDL in a healthy range remains one of the most effective ways to protect your heart.
Why one number cannot show everything
A standard cholesterol test is a snapshot. It measures LDL, HDL, total cholesterol, and triglycerides on one day. It does not measure lipoprotein(a), inflammation, blood pressure, blood sugar, smoking, or family history, and it cannot show how much plaque has already built up over the years. That is why doctors estimate heart risk from many factors together, not from LDL alone.
02 / The researchWhat did researchers discover?
A research team analyzed health data from the UK Biobank, a large long-term health study of adults in the United Kingdom. They focused only on people whose LDL cholesterol was already below 2.6 mmol/L (about 100 mg/dL) at the start and who had never had a heart attack. The average age was about 57.
At the start, researchers measured three blood markers: lipoprotein(a), C-reactive protein (CRP), and remnant cholesterol. They then compared heart attack rates among people with high and low levels of each, after adjusting for other risk factors.
- High lipoprotein(a): about a 25% higher relative hazard of heart attack.
- High CRP: about a 25% higher relative hazard of heart attack.
- High remnant cholesterol: no statistically significant link after adjustment in this study.
Numbers are adjusted hazard ratios from the primary study. A model that combined all three markers predicted heart attacks better than any single marker. "High" levels were defined by cutoffs the researchers derived from their own data, not by standard clinical cutoffs.
Relative risk is not the same as absolute risk
A hazard ratio of 1.87 means people with all three elevated markers had about an 87% higher relative hazard than people with none. It does not mean they had an 87% chance of having a heart attack.
For perspective, about 5 in every 100 people in the whole study (1,665 of 34,692) had a heart attack during a median of 13.6 years of follow-up.
Illustration only, using round numbers. It is not a result from the study, and hazard ratios do not convert exactly into risks. It shows why a large relative increase can still be a modest change in absolute terms.
Researchers observed patterns in existing data. Associations like these do not prove that any one biomarker directly caused a heart attack. Markers were measured once at the start, other unmeasured factors may play a role, and UK Biobank volunteers tend to be healthier and less socioeconomically deprived than the general UK population, so results may not apply equally to everyone.
Supporting research
A separate, larger analysis of 306,183 UK Biobank adults without heart disease followed people for about 15 years, during which 10,824 heart attacks occurred. Each of the same three markers added information beyond LDL cholesterol, and people with all three in the top 20% had about 2.8 times the relative hazard of a first heart attack compared with people who had none in the top 20%. Like the primary study, it was observational, so it shows patterns but cannot prove the markers caused the heart attacks. This analysis included people across all LDL levels, and both studies drew on UK Biobank data, so they are not fully independent confirmations of each other.
03 / Beyond LDLThree additional cardiovascular markers
Lipoprotein(a)
Lipoprotein(a), often written Lp(a) and said "L-P-little-a," is an LDL-like particle with an extra protein attached. Your level is mostly inherited and stays fairly steady throughout life, so diet and exercise change it very little. High Lp(a) is linked to atherosclerotic heart disease even when LDL is well controlled.
Because a standard cholesterol panel does not include it, many people have never had it measured. The 2026 ACC/AHA dyslipidemia guideline recommends measuring Lp(a) at least once in adulthood. Recommendations can differ between guidelines and clinical situations, so your clinician can tell you whether and when testing makes sense for you.
Why measure Lp(a) if it is mostly genetic?
Knowing your level can help refine your overall risk estimate. In the 2026 ACC/AHA guideline, a level of 125 nmol/L (50 mg/dL) or higher is treated as a risk-enhancing factor, which may lead a clinician to manage other risk factors, such as LDL and blood pressure, more closely.
Because levels are largely inherited, a high result can also be a reason for close relatives to ask their own clinicians about testing.
C-reactive protein
C-reactive protein (CRP) is a protein made by the liver. Its level rises when there is inflammation in the body. A high-sensitivity CRP test can detect small increases that may reflect low-grade inflammation in blood vessels.
CRP is not specific to the heart. It can rise with an infection, an injury, a recent illness, or inflammatory conditions such as arthritis. A CRP result alone cannot diagnose coronary artery disease or show where inflammation is coming from.
How do clinicians use CRP?
When it is used for heart risk, CRP is one piece of a larger picture. Because a cold or a tough workout can temporarily raise it, a clinician may repeat the test before drawing conclusions. In US prevention guidelines, a persistently elevated high-sensitivity CRP is listed as one of several factors that can increase estimated risk.
Remnant cholesterol
Remnant cholesterol is the cholesterol carried by triglyceride-rich lipoproteins, the particles that move fat from food and from the liver through the blood. It can be estimated from a standard panel: total cholesterol minus LDL minus HDL.
Broader research links higher remnant cholesterol to heart attacks. The larger UK Biobank analysis, for example, found it was associated with higher heart attack risk. In the primary study of people with low LDL, however, remnant cholesterol was not independently linked to heart attack once other factors were taken into account.
Why might the studies disagree?
The two analyses looked at different groups (people with low LDL versus people at all LDL levels), used different cutoffs for "high," and adjusted for different factors. One study does not settle the question. It does show that remnant cholesterol may carry less independent information in people whose LDL is already low.
04 / The bigger pictureWhy heart attacks can occur despite low LDL
Heart disease rarely has a single cause. Many factors can damage arteries or raise the chance of a clot, regardless of LDL level.
High blood pressure
Constant extra force strains artery walls and speeds plaque growth.
Smoking and tobacco exposure
Damages the artery lining and makes blood more likely to clot, including secondhand smoke.
Diabetes and insulin resistance
High blood sugar and insulin resistance are linked to damaged blood vessels and faster atherosclerosis.
Family history and inherited risk
Early heart disease in close relatives, or inherited traits such as high Lp(a), can raise risk.
Physical inactivity
Low activity is tied to higher blood pressure, weight gain, and poorer blood sugar control.
Excess visceral fat
Fat stored deep around the organs is closely linked to insulin resistance and inflammation.
Chronic kidney disease
Reduced kidney function is associated with a higher risk of heart disease.
Inflammatory conditions
Conditions such as rheumatoid arthritis, psoriasis, and lupus are associated with higher cardiovascular risk.
Existing atherosclerotic plaque
Plaque that built up over earlier years does not disappear just because LDL is lower today.
These factors do not all carry the same weight, and none of them guarantees a heart attack. Risk adds up from the combination of factors a person has, which is why a full assessment matters more than any single result.
05 / Our focusWhat can exercise actually do?
Exercise cannot rewrite your genes, but it acts on many of the factors above at once. Regular physical activity can:
- Improve cardiorespiratory fitness, so your heart and lungs handle everyday effort more easily.
- Support healthy blood pressure.
- Improve insulin sensitivity and blood sugar control.
- Help with body-weight management, including reducing body fat.
- Support healthier triglyceride levels.
- Improve overall cardiovascular health and lower the risk of heart disease.
Aerobic exercise and resistance (strength) training both help, and the American Heart Association notes that combining them may offer the most benefit for cardiovascular risk factors.
General public-health guidance for adults
The Physical Activity Guidelines for Americans recommend:
- Aerobic activity: 150 to 300 minutes a week of moderate intensity (such as brisk walking), or 75 to 150 minutes of vigorous intensity, or a mix.
- Muscle strengthening: at least 2 days a week, working all major muscle groups.
- Move more, sit less: some activity is better than none, and short bouts count.
Aerobic
About 30 minutes of brisk walking, cycling, or swimming on 5 days.
Strength
2 full-body sessions: a squat or leg press, a hip hinge, a push, a pull, and a loaded carry.
Progression
Start where you are. Add time, sets, or load gradually as each week feels manageable.
This example week is general coaching guidance, not an individual prescription.
Exercise reduces risk, but it cannot erase inherited risk such as a high Lp(a), and it does not replace medication or other treatment your clinician recommends. If you have heart disease, chest pain, unusual shortness of breath, diabetes, or other medical conditions, check with your healthcare professional before starting a new or more intense program.
06 / Next stepsWhat should readers discuss with their healthcare professional?
The goal is to understand your whole cardiovascular risk profile rather than focus on one lab value. Topics worth raising include:
- A standard lipid panel, including LDL, HDL, and triglycerides, and what your results mean for you.
- Blood pressure, measured at visits and, if advised, at home.
- Diabetes screening when it is indicated for your age and risk factors.
- Family history, especially heart attacks or strokes in close relatives at younger ages.
- Lp(a) testing, if you have not had it measured.
- Other tests when clinically appropriate, chosen by your clinician based on your situation.
Not every person needs every advanced test. Your clinician weighs your history and current risk factors to decide what is useful. This article does not interpret personal lab results, and you should not start, stop, or change any medication without talking to your prescriber.
If you have chest pain, pressure, or other possible heart attack symptoms, call emergency services right away (911 in the United States).
07 / Our viewThe Teleport Strength perspective
One number does not tell the entire story of your health. Understanding your body means looking beyond a single measurement and recognizing how exercise, nutrition, lifestyle, genetics, and preventive healthcare work together.
Strength and wellness go well beyond appearance or how much you can lift. They include a heart and blood vessels that can support you for decades, and the habits that keep them that way.
Before you know it, you'll be there.Key termsPlain-language explainers
LDL cholesterol
Cholesterol carried in low-density lipoprotein particles. When there is too much of it, LDL can enter artery walls and contribute to plaque. It is often called "bad" cholesterol.
Atherosclerosis
The gradual buildup of plaque, made of cholesterol, immune cells, and other material, inside artery walls. It can narrow arteries and set the stage for heart attacks and strokes.
Lipoprotein(a)
An LDL-like particle with an extra protein attached. Levels are mostly inherited and stay fairly stable over life. High levels are linked to higher heart disease risk.
C-reactive protein
A protein made by the liver that rises with inflammation anywhere in the body. It is not specific to the heart and can rise with infections or injuries.
Remnant cholesterol
Cholesterol carried by triglyceride-rich particles. It is often estimated as total cholesterol minus LDL minus HDL.
Myocardial infarction
The medical term for a heart attack. It happens when blood flow to part of the heart muscle is blocked long enough to damage that muscle.
Inflammation
The body's response to injury or infection. Short-term inflammation helps healing. Ongoing, low-grade inflammation is linked to damage in blood vessels.
Relative risk
How much higher or lower risk is in one group compared with another, shown as a ratio or percentage. "87% higher" is a relative comparison, not a chance of something happening.
Absolute risk
The actual chance of something happening in a group over a period of time, such as 5 in 100 people over 10 years.
Insulin resistance
When the body's cells respond poorly to insulin, so more insulin is needed to keep blood sugar in range. It often comes before type 2 diabetes and is linked to heart disease risk.
Strength Is More Than What You Lift
Building strength is one part of supporting your long-term health. At Teleport Strength, we focus on helping individuals develop sustainable exercise habits, understand their training, and take a more informed approach to fitness and wellness.
See How Coaching WorksSourcesScientific references
- Observational cohortChen C, Chen F, Tian Y, Chen W, Li G, Zhou L. Residual cardiovascular risk factors and incident myocardial infarction in individuals with low levels of baseline low-density lipoprotein cholesterol: a cohort study. Nutrition, Metabolism and Cardiovascular Diseases. 2026:104773. doi.org/10.1016/j.numecd.2026.104773
- Observational cohortKazibwe R, Schaich CL, Kingsley JA, Chevli P, Mirzai S, Rikhi R, Shapiro MD. Lipoprotein(a), remnant cholesterol, and high-sensitivity C-reactive protein as complementary biomarkers for myocardial infarction risk assessment. Progress in Cardiovascular Diseases. 2026. doi.org/10.1016/j.pcad.2026.04.011
- Consensus statementFerence BA, Ginsberg HN, Graham I, et al. Low-density lipoproteins cause atherosclerotic cardiovascular disease. 1. Evidence from genetic, epidemiologic, and clinical studies. A consensus statement from the European Atherosclerosis Society Consensus Panel. European Heart Journal. 2017;38(32):2459 to 2472. doi.org/10.1093/eurheartj/ehx144
- Meta-analysis of randomized trialsCholesterol Treatment Trialists' (CTT) Collaboration. Efficacy and safety of more intensive lowering of LDL cholesterol: a meta-analysis of data from 170,000 participants in 26 randomised trials. The Lancet. 2010;376(9753):1670 to 1681. doi.org/10.1016/S0140-6736(10)61350-5
- Clinical guidelineArnett DK, Blumenthal RS, Albert MA, et al. 2019 ACC/AHA guideline on the primary prevention of cardiovascular disease. Circulation. 2019;140(11):e596 to e646. doi.org/10.1161/CIR.0000000000000678
- Clinical guidelineBlumenthal RS, Morris PB, Gaudino M, et al. 2026 ACC/AHA/AACVPR/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA guideline on the management of dyslipidemia. Journal of the American College of Cardiology. 2026;87(19):2624 to 2757. doi.org/10.1016/j.jacc.2025.11.016
- Patient educationMedlinePlus, U.S. National Library of Medicine. C-Reactive Protein (CRP) Test. medlineplus.gov
- Federal guidelinesU.S. Department of Health and Human Services. Physical Activity Guidelines for Americans, 2nd edition. 2018. odphp.health.gov
- Scientific statementPaluch AE, Boyer WR, Franklin BA, et al. Resistance exercise training in individuals with and without cardiovascular disease: 2023 update. A scientific statement from the American Heart Association. Circulation. 2024;149(3):e217 to e231. doi.org/10.1161/CIR.0000000000001189
- News releaseAmerican Heart Association Newsroom. Analyzing 3 biomarker tests together may help identify high heart disease risk earlier. November 2025. newsroom.heart.org
- Cohort comparisonFry A, Littlejohns TJ, Sudlow C, et al. Comparison of sociodemographic and health-related characteristics of UK Biobank participants with those of the general population. American Journal of Epidemiology. 2017;186(9):1026 to 1034. doi.org/10.1093/aje/kwx246
This article is for general education and does not replace individualized medical advice. Teleport Strength coaching does not diagnose, treat, or prevent heart disease. Talk with your healthcare professional about your personal risk, testing, and treatment.