The short answer
LDL usually goes up on keto because most of the carbohydrate you cut is replaced by fat, often saturated fat from meat, butter, cheese and cream, and saturated fat raises LDL. The 2026 ACC/AHA cholesterol guideline warns that on ketogenic diets LDL "can be increased substantially in some individuals, particularly when there is high consumption of animal products". The biggest rises tend to happen in lean, metabolically healthy people, sometimes called lean mass hyper-responders.
General information, not medical advice
If your LDL is 190 mg/dL (4.9 mmol/L) or higher, or you have heart disease, diabetes, kidney disease or a family history of early heart attacks, talk to your doctor before deciding what to change. Don't stop or start medication on your own.
Why LDL rises on a ketogenic diet
A ketogenic diet cuts carbohydrate to about 20–50g a day, and the 2026 guideline notes that most of those calories are replaced by fat, "often saturated fat". A few things then push LDL up:
- More saturated fat. Saturated fat reduces the activity of the LDL receptors your liver uses to clear LDL from the blood, so more stays in circulation. The guideline describes a graded link: the more saturated fat, the higher the LDL.
- More dietary cholesterol. Eggs, meat and full-fat dairy add cholesterol. For most people this matters less than saturated fat, but some respond more than others.
- Ketosis and rapid weight loss. The guideline's list of secondary causes of high LDL includes high saturated fat, trans fat and cholesterol intake, rapid weight loss and ketosis itself. LDL can climb while weight is falling quickly and settle once weight is stable.
Exactly why some people respond so much more strongly than others is still being studied. It isn't simply a sign that you did keto wrong.
What is a lean mass hyper-responder?
"Lean mass hyper-responder" (LMHR) is a label that came out of low-carb online communities. It was first tested in a 2022 study by Norwitz and colleagues, who analysed a web survey of 548 adults on carbohydrate-restricted diets. They defined the pattern as:
| Marker on a low-carb diet | mg/dL | mmol/L |
|---|---|---|
| LDL cholesterol | 200 or higher | 5.2 or higher |
| HDL cholesterol | 80 or higher | 2.1 or higher |
| Triglycerides | 70 or lower | 0.8 or lower |
One hundred respondents fitted it. They were leaner than the rest and had had similar LDL before the diet. Across the whole survey, the lower someone's BMI and the lower their triglyceride-to-HDL ratio, the bigger their LDL rise tended to be.
The idea is debated. A published critique pointed out that BMI and the triglyceride-to-HDL ratio explained only about 7% of the variation in how much LDL changed, that LDL rose by a clinically meaningful 35–44 mg/dL (0.9–1.1 mmol/L) even in the heaviest quarter of respondents, and that a self-selected online survey can be biased. So treat LMHR as a description of a pattern some people see, not a diagnosis.
How much can LDL go up on keto?
It varies enormously, from a fall to more than doubling:
- In a four-week feeding study of 17 lean, healthy young women cited in the 2022 paper, a very-low-carbohydrate diet raised LDL by 70 mg/dL (1.8 mmol/L) compared with their usual diet, and every one of them saw a rise.
- In a study of 262 people with type 2 diabetes on a very-low-carbohydrate diet, also cited there, LDL rose by an average of only 11 mg/dL (0.3 mmol/L) after two years.
- In the 2024 KETO trial, 80 long-term keto dieters who'd been recruited because their LDL was very high had an average LDL of 272 mg/dL (7.0 mmol/L), up from 122 mg/dL (3.2 mmol/L) before the diet.
People with obesity, insulin resistance or type 2 diabetes often see small changes and a big fall in triglycerides. Lean, active people with low triglycerides are the ones most likely to see large rises.
Is high LDL on keto dangerous?
Nobody knows for certain yet, because there are no long-term outcome trials in people with keto-induced high LDL. What we do know:
- LDL causes atherosclerosis in general. The 2026 guideline says the risk from very high LDL rises with both the size of the elevation and how many years you're exposed to it.
- The guideline treats it as real. It tells clinicians to take a careful diet history in anyone with LDL of 190 mg/dL (4.9 mmol/L) or above, and to help people with keto-related high LDL lower it "while still achieving the primary goal of the dietary change".
- The imaging studies are small and early. The 2024 KETO trial found no difference in coronary plaque between 80 keto dieters and 80 matched people with much lower LDL. The authors called it preliminary: it was small, cross-sectional and recruited through social media. A 2025 one-year follow-up from the same group (KETO-CTA, "Plaque Predicts Plaque, ApoB Does Not") was retracted in May 2026, so it shouldn't be relied on.
The honest answer is that a large, sustained rise in LDL is a risk you should take seriously, even if you feel well and your other numbers look good.
What to do if your LDL went up on keto
- Get a full picture. Ask for a repeat lipid panel, and check that nothing else is raising LDL: the guideline's list includes an underactive thyroid, kidney and liver disease and some medicines. ApoB and a one-off Lp(a) test can add useful detail. Our guide to reading your cholesterol test results explains every number in mg/dL and mmol/L.
- Change the fat, not the carbs. You can stay low-carb and still cut saturated fat. Cook with olive or rapeseed oil instead of butter, ghee or coconut oil (see the best oils and fats for high cholesterol). Swap some red and processed meat for oily fish, chicken, eggs and tofu, and get more of your fat from nuts, seeds and avocado. Our guide to how much saturated fat per day shows where it adds up fastest.
- Consider a little more carbohydrate. In the five-patient case series in the 2022 paper, moderately reintroducing carbohydrate brought LDL down markedly. Beans, lentils, oats and berries add soluble fibre, which helps lower LDL too.
- Measure again. Give a change at least a few weeks before retesting. The guideline uses 4–12 weeks as the window for judging lifestyle changes and new medication. Compare like with like: same lab, and ideally both tests fasting or both not.
- Talk about medication if it stays high. The guideline treats an LDL of 190 mg/dL (4.9 mmol/L) or higher as severe hypercholesterolaemia. If it stays there once diet and other causes have been dealt with, it recommends a statin.
For lower-saturated-fat ideas that work on most low-carb plans, see our 100 cholesterol-lowering food swaps and low-cholesterol snacks. If you're wondering about eggs specifically, read how many eggs a day you can eat with high cholesterol.
Dietary cholesterol "hyper-responders"
You may also see "hyper-responder" used in an older sense: people whose blood cholesterol rises more than average when they eat cholesterol, for example from eggs. That's a different idea from LMHR, though both point to the same lesson. People respond very differently to the same diet, and the only way to know how you respond is to compare your own results before and after a change.
That's where tracking helps. Our roundup of the best cholesterol tracking apps compares which apps let you log meals alongside your lipid results.
See what your low-carb diet is doing to your LDL
Heart Tracker adds up saturated fat as you log meals by barcode, search or voice, so you can keep carbs low while cutting the fats that raise LDL. Log each lipid panel and see your LDL before and after the change. Free, with no account needed.
Download Heart Tracker FreeLDL and keto: quick answers
Is it normal for LDL to go up on keto?
It's common. The 2026 ACC/AHA guideline says LDL can rise substantially on ketogenic diets in some people, especially when they eat a lot of animal products. Many people see little change or a fall, and lean, metabolically healthy people tend to see the largest rises.
How much does LDL go up on keto?
It varies from a fall to more than doubling. In one feeding study of lean young women, a very-low-carb diet raised LDL by 70 mg/dL (1.8 mmol/L) in four weeks, while people with type 2 diabetes in another study averaged a rise of only 11 mg/dL (0.3 mmol/L) after two years.
What is a lean mass hyper-responder?
Someone on a low-carb diet whose LDL rises to 200 mg/dL (5.2 mmol/L) or more while HDL is 80 mg/dL (2.1 mmol/L) or more and triglycerides are 70 mg/dL (0.8 mmol/L) or less. The term comes from a 2022 survey study, and how useful it is remains debated.
Is high LDL on keto dangerous if my HDL and triglycerides are good?
It isn't known for sure, because there are no long-term outcome trials. LDL causes atherosclerosis in general, and the risk grows with how high it is and for how long. The 2026 guideline treats an LDL of 190 mg/dL (4.9 mmol/L) or more as severe hypercholesterolaemia and says keto can cause it. A 2025 imaging study often cited as reassurance (KETO-CTA) was retracted in 2026.
Can I stay on keto and lower my LDL?
Often, yes. Replace butter, ghee, coconut oil, fatty and processed meat and cream with olive or rapeseed oil, oily fish, nuts, seeds and avocado. Some people also need to add back a moderate amount of carbohydrate, such as beans, lentils or oats, to bring LDL down.
Will my LDL come down if I stop keto?
For most people LDL falls when saturated fat intake drops or carbohydrate is reintroduced; in a small case series, moderate carbohydrate reintroduction lowered LDL markedly. Retest a few weeks after any change to see how you respond.
Sources
- 2026 ACC/AHA/multisociety Guideline on the Management of Dyslipidemia. Journal of the American College of Cardiology. March 2026. (Ketogenic diets, secondary causes of high LDL in Table 15, monitoring.)
- Norwitz NG, Feldman D, Soto-Mota A, Kalayjian T, Ludwig DS. Elevated LDL cholesterol with a carbohydrate-restricted diet: evidence for a "lean mass hyper-responder" phenotype. Current Developments in Nutrition. 2022;6(1):nzab144.
- Moore JM, et al. Evidence for a lean mass hyperresponder phenotype is lacking with increases in LDL cholesterol of clinical significance in all categories of response to a carbohydrate-restricted diet. Current Developments in Nutrition. 2022;6(5):nzac043.
- Budoff M, et al. Carbohydrate restriction-induced elevations in LDL-cholesterol and atherosclerosis: the KETO trial. JACC: Advances. 2024;3(8):101109.
- Soto-Mota A, et al. Longitudinal data from the KETO-CTA study: plaque predicts plaque, ApoB does not. JACC: Advances. 2025;4(7):101686. Retracted (JACC: Advances 2026;5(5):102824).