Most cholesterol advice focuses on bringing LDL down, so searching for ways to raise it usually means something specific is going on. You may have lab results showing unusually low LDL, a doctor flagging hypocholesterolemia, or a condition that’s pulling your cholesterol below healthy levels. Healthy LDL for adults is generally below 100 mg/dL, but levels that drop well beneath that range can signal nutritional absorption problems, liver dysfunction, or other underlying issues worth addressing. Understanding what drives LDL higher can help you and your doctor figure out the right approach.
Why Low LDL Sometimes Matters
Cholesterol isn’t just a number to minimize. Your body uses it to build cell membranes, produce hormones, and absorb fat-soluble vitamins (A, D, E, and K). When LDL drops too low, these processes can suffer. Cleveland Clinic notes that hypocholesterolemia may lead to mild liver dysfunction or fatty liver disease, and that poor absorption of fat-soluble vitamins can cause problems with your eyes, brain, muscles, and bones.
Very low cholesterol can also be a red flag for serious illness. Clinicians sometimes treat it as a marker of poor prognosis, particularly in people with sepsis or other severe infections. Genetic conditions like abetalipoproteinemia can cause chronically low cholesterol from birth, leading to diarrhea, poor muscle control, and developmental problems. If your LDL is persistently very low without an obvious explanation like medication, it’s worth investigating why.
Saturated Fat and LDL Levels
The single most direct dietary lever for raising LDL is saturated fat. When you eat more saturated fat, your liver produces fewer LDL receptors, the proteins on cell surfaces that pull LDL particles out of your bloodstream. With fewer receptors working, LDL accumulates in the blood and levels rise. Research in the Journal of Lipid Research showed this relationship clearly: when people reduced their saturated fat intake, LDL receptor numbers increased by about 10.5%, and their LDL cholesterol dropped by roughly 11.8%. The reverse also holds. Eating more saturated fat suppresses those receptors and pushes LDL up.
Foods high in saturated fat include butter, cheese, red meat, coconut oil, and full-fat dairy. If your goal is to raise LDL from abnormally low levels, increasing these foods is the most straightforward dietary change. That said, raising LDL through saturated fat alone may overshoot the mark or create other cardiovascular risks, which is why working with a doctor or dietitian matters here.
How Very Low-Carb Diets Raise LDL
Ketogenic and other carbohydrate-restricted diets can dramatically increase LDL, especially in lean, active people. Researchers have identified a pattern called the “lean mass hyper-responder” phenotype: people on very low-carb diets whose LDL climbs to 200 mg/dL or higher, alongside HDL above 80 mg/dL and triglycerides below 70 mg/dL. In one study, the average LDL in this group hit 320 mg/dL, with HDL at 99 mg/dL and triglycerides at just 47 mg/dL.
This pattern appears to be driven by the body ramping up fat metabolism in the absence of dietary carbohydrates. The liver produces more cholesterol-carrying particles to shuttle fatty acids for energy. If you’re on a low-carb diet and your LDL has risen sharply, this is likely why. Whether this particular type of LDL elevation carries the same cardiovascular risk as other forms is still being studied, but it’s a well-documented mechanism for significant LDL increases.
Trans Fats: A Dangerous Way to Raise LDL
Trans fats raise LDL more aggressively than saturated fat, and they simultaneously lower HDL, your protective cholesterol. This double effect makes them uniquely harmful. Found in partially hydrogenated oils, some fried foods, and certain processed baked goods, trans fats are the worst type of fat for your lipid profile. If your goal is to raise LDL for health reasons, trans fats are not the way to do it. The cardiovascular damage they cause far outweighs any benefit from higher LDL numbers.
Medical Conditions That Lower LDL
If your LDL is unusually low, it may not be a dietary issue at all. Hyperthyroidism (an overactive thyroid) can suppress LDL because thyroid hormones increase the number of LDL receptors on liver cells, clearing LDL from the blood faster than normal. The relationship works in both directions: an underactive thyroid raises LDL by reducing receptor production and boosting cholesterol synthesis in the liver. If your thyroid is overactive and driving LDL down, treating the thyroid condition itself will typically bring cholesterol back to normal levels.
Malabsorption disorders like celiac disease and Crohn’s disease can also result in low cholesterol because your gut isn’t absorbing fats properly. Liver disease, malnutrition, and certain cancers are other potential causes. In these cases, raising LDL isn’t really the goal. Treating the underlying condition is, and LDL recovery follows naturally.
Medications That Raise LDL
Several common medications push LDL higher as a side effect. If you’re taking one of these and your LDL is low, adjusting your medication under a doctor’s supervision could shift the balance.
- Corticosteroids like prednisone can significantly raise LDL, sometimes within just a few weeks at high doses, while simultaneously lowering HDL.
- Diuretics, particularly thiazide and loop types used for blood pressure, cause temporary increases in total and LDL cholesterol.
- Beta-blockers such as propranolol, atenolol, and metoprolol primarily lower HDL but can worsen your overall cholesterol ratio.
- Anabolic steroids cause dramatic LDL spikes and HDL drops.
- Cyclosporine, an immunosuppressant, raises LDL as a known side effect.
This isn’t a recommendation to take these medications for the purpose of raising LDL. But if you’re already on one and wondering why your cholesterol has shifted, this may explain it.
Exercise, Body Weight, and LDL
Physical activity and body composition influence LDL in complex ways. Research on overweight adults found that replacing sitting with standing and walking decreased LDL particle concentration by 86 nmol/L and reduced small, dense LDL cholesterol. Interestingly, the same activity increased large LDL particle size and concentration. So being sedentary tends to raise LDL overall, but it raises the type of LDL associated with higher cardiovascular risk (small, dense particles) rather than the larger, less harmful type.
If your LDL is low and you’re very physically active, reducing exercise intensity isn’t a sensible trade-off. But understanding that a highly active lifestyle can contribute to lower LDL helps explain your numbers. Similarly, being significantly underweight can result in low cholesterol simply because your body doesn’t have enough raw material to produce it.
Genetic Causes of Extreme LDL Levels
Genetics play a major role in where your LDL sits. On the high end, familial hypercholesterolemia is a genetic condition where mutations in the LDL receptor gene, or in genes affecting how that receptor works, prevent your body from clearing LDL efficiently. Adults with this condition often have LDL persistently above 190 mg/dL, and some exceed 250 mg/dL even without dietary risk factors. On the low end, genetic variants in a protein called PCSK9 can make LDL receptors work overtime, pulling LDL from the blood so efficiently that levels stay very low throughout life.
If your LDL has always been at one extreme or the other regardless of diet and lifestyle, genetic testing can identify whether you carry one of these variants. This information changes how your doctor approaches both your cholesterol management and your broader cardiovascular risk.