Here is the honest answer first: your LDL (“bad”) cholesterol is mostly inherited. A cardiologist at NewYork-Presbyterian puts genetics at roughly 75 to 85 percent of your LDL level, and a meta-analysis of 51 exercise studies found that training lowers LDL by only about 5 percent. So why train at all? Because exercise raises HDL, cuts triglycerides and shrinks the belly fat that drives them, and because the right fibre and a modest weight loss stack on top. After 35 the numbers start to count, and knowing them is the first step.
Key takeaways
- For a healthy adult, LDL below 100 mg/dL (2.6 mmol/L) is optimal, triglycerides below 150 mg/dL (1.7 mmol/L) are desirable, and HDL under 40 mg/dL for men or 50 mg/dL for women is a warning sign.
- Regular aerobic exercise raises HDL by around 4 to 5 percent and trims triglycerides. LDL moves only a few percent unless the dose or intensity is high.
- Resistance training helps too, and volume matters more than load: moderate weights matched heavy weights for LDL in head-to-head trials.
- Three grams a day of oat beta-glucan lowers LDL by about 0.25 mmol/L (10 mg/dL) across 28 randomised trials.
- HDL often dips while you are actively losing weight and recovers once your weight stabilises, so retest after a diet, not during it.
- If six months of solid lifestyle work does not get you to target, a conversation about medication is a smart move, not a failure.
Why cholesterol starts to matter after 35
Cholesterol damage is cumulative. The longer your arteries sit in a high-LDL environment, the more plaque has time to build, which is why cardiologists talk about keeping it “lower for longer” rather than fixing it at 55.
The American Heart Association recommends that adults from age 20 get checked every four to six years if their risk is low. Mayo Clinic adds that you need more frequent testing if your first result was high, you have a family history of high cholesterol or heart disease, you are overweight, you smoke, you have diabetes or high blood pressure, or you get little physical activity. For most busy people in their late thirties and forties, at least one of those applies.
If you have not had a lipid panel in the past five years, book one. It fits alongside the other checks in our guide to heart health after 35.
The numbers to know
Labs report in mg/dL in the US and in mmol/L in the UK, Europe, Canada and Australia. The table below uses US categories from Mayo Clinic; Canadian and European guidelines differ slightly, and your own LDL target depends on your overall risk.
| Marker | What it tells you | Desirable | Watch zone |
|---|---|---|---|
| Total cholesterol | Everything added together; a blunt number on its own | Below 200 mg/dL (5.2 mmol/L) | 200 to 239 borderline; 240 and above (6.2 mmol/L) high |
| LDL cholesterol | The cholesterol carried in particles that build plaque | Below 100 mg/dL (2.6 mmol/L) for healthy adults; below 70 (1.8 mmol/L) if you already have artery disease or very high risk | 100 to 129 near optimal; 130 to 159 (3.4 to 4.1 mmol/L) borderline high; 160 to 189 high; 190 and above (4.9 mmol/L) very high |
| HDL cholesterol | Particles that carry cholesterol back to the liver; higher is better up to a point | 60 mg/dL (1.5 mmol/L) and above is best | Below 40 mg/dL (1.0 mmol/L) in men or below 50 mg/dL (1.3 mmol/L) in women is poor |
| Triglycerides | Blood fat that rises when you eat more energy than you burn; tracks belly fat and insulin resistance | Below 150 mg/dL (1.7 mmol/L) | 150 to 199 borderline high; 200 to 499 (2.3 to 5.6 mmol/L) high; 500 and above very high |
| Non-HDL cholesterol | Total minus HDL: all the cholesterol in the particles that can clog arteries, with no extra test needed | Lower is better; ask your doctor for the target that fits your risk | Especially useful when triglycerides are high and LDL alone may understate risk |
| ApoB (apolipoprotein B) | Counts the number of artery-clogging particles rather than the cholesterol inside them | Your doctor interprets it against your risk | Worth checking once; most useful with a family history, high triglycerides, diabetes or an LDL that does not match your risk |
What about ApoB?
Each LDL particle carries exactly one ApoB protein, so measuring ApoB counts particles directly. Dr Corey Bradley, a cardiologist at NewYork-Presbyterian/Columbia, calls it “the best predictor of heart disease risk” and suggests everyone gets screened once. Two people can have the same LDL in mg/dL but very different particle counts, and the one with more particles carries more risk.
Do you need to fast?
Traditionally you avoid food and drink other than water for 9 to 12 hours before the test, which is why it is usually done first thing in the morning. Some panels no longer require fasting, so follow the instructions you are given. Bring a snack for afterwards.
What exercise actually does to your cholesterol
A 2014 review in Sports Medicine by Mann, Beedie and Jimenez pulled together the trials on aerobic, resistance and combined training. The pattern is consistent: HDL and triglycerides respond readily, LDL is stubborn, and both dose and intensity matter.
Aerobic exercise: HDL up, triglycerides down, LDL a little
The largest pooled analysis in the review covered 51 training interventions in around 4,700 people lasting at least 12 weeks. Average changes: HDL up 4.6 percent, triglycerides down 3.7 percent, LDL down 5 percent, total cholesterol unchanged.
Volume moves the needle. In the STRRIDE trial, people who did the equivalent of about 32 km (20 miles) of jogging a week at 65 to 80 percent of VO2 peak for six to eight months saw HDL rise from 44 to 49 mg/dL and triglycerides fall from 167 to 139 mg/dL. Their LDL barely budged, from 130 to 128 mg/dL.
Intensity is what finally shifts LDL. In a 24-week trial that matched energy expenditure at 400 kcal per session, three times a week, the group working at 60 percent of VO2 max saw no significant lipid changes. The group at 80 percent saw total cholesterol fall from 6.02 to 5.48 mmol/L, LDL from 4.04 to 3.52 mmol/L (about 20 mg/dL) and non-HDL from 4.58 to 4.04 mmol/L.
The review’s conclusion is practical: HDL improves at low to moderate doses with a roughly linear dose response, and the authors point to around 1,100 kcal of weekly exercise as the level where HDL changes appear. Lowering LDL and triglycerides generally needs higher intensity or greater total energy expenditure. Easy aerobic work still earns its place, and our guide to zone 2 training explains how to build that base without wrecking your knees.
Resistance training: moderate loads, more volume
Lifting changes lipids too. In a six-week trial in men training three times a week, a moderate-load group at 45 to 55 percent of one-rep max lowered LDL by 13.5 mg/dL, while a heavy group at 80 to 90 percent lowered LDL by 12.1 mg/dL and raised HDL by 5.5 mg/dL. In premenopausal women, 14 weeks of lifting at 85 percent of one-rep max cut total cholesterol from 4.6 to 4.26 mmol/L and LDL from 2.99 to 2.57 mmol/L. Eight weeks of circuit training, three to four 60-minute sessions a week, took total cholesterol from 203 to 186 mg/dL and triglycerides from 122 to 91 mg/dL.
Across these studies the review found that more sets and repetitions mattered more than heavier loads, and that intensities above 85 percent of one-rep max were no more effective than moderate weights. That is good news after 35: you do not need to grind heavy singles to help your lipids. Lifting also improves how your muscles handle glucose, which we cover in our piece on insulin sensitivity.
Combining both
In a 16-week study in men, combined aerobic plus resistance training lowered LDL from 4.39 to 3.23 mmol/L, compared with 3.64 to 2.87 mmol/L for aerobic training alone. The difference between groups was not statistically significant, but adding lifting did not blunt the aerobic benefit, and it brings its own gains in muscle and bone.
The review’s minimum recommendation for healthy adults is more than 30 minutes of activity on five days a week, built around prolonged moderate aerobic work at 70 to 80 percent of heart rate reserve plus low-intensity resistance training at about 50 percent of one-rep max. If you already have abnormal lipids, the authors suggest progressing the cardio towards 85 percent of max heart rate and lifting at 75 to 85 percent of one-rep max.
A realistic week in 3 to 4 hours
- Two steady cardio sessions, 40 to 45 minutes each: brisk uphill walking, cycling, swimming or easy running at a pace where you can speak in short sentences. This is your HDL and triglyceride work.
- One harder session, 25 to 35 minutes: once you have four to six weeks of base, add tempo efforts or intervals at a pace where talking is hard. This is the intensity that nudges LDL.
- Two full-body lifting sessions, 30 to 40 minutes: squats, hinges, presses, rows and carries, 2 to 3 sets of 10 to 15 reps with a weight you could lift a few more times. Circuits work well if time is tight.
- Daily movement: walking adds to the weekly energy total that drives the HDL response.
Fibre: the food lever with the best evidence
Soluble fibre binds bile acids in the gut, so your liver pulls cholesterol from the blood to make more. The best-studied form is oat beta-glucan. A 2014 meta-analysis in the American Journal of Clinical Nutrition pooled 28 randomised trials lasting 2 to 12 weeks and found that 3 grams or more a day of oat beta-glucan lowered LDL by 0.25 mmol/L (about 10 mg/dL) and total cholesterol by 0.30 mmol/L, with no effect on HDL or triglycerides.
That is a similar size to what a hard, high-volume exercise programme achieved for LDL, and it costs you a bowl of porridge. Ways to hit 3 grams a day:
- A generous bowl of oat porridge or overnight oats at breakfast (many packs list beta-glucan per serving; check yours).
- Oats blended into a yoghurt or protein shake after training.
- Barley in place of rice in a soup or salad once or twice a week.
- Lentils, beans, chickpeas, vegetables and fruit alongside, so the rest of your fibre intake does its share.
All of these are vegetarian-friendly, and the same pattern of eating supports blood pressure, which we cover in how to lower blood pressure naturally.
Weight loss: what moves, and when to retest
A meta-analysis of 70 studies in the American Journal of Clinical Nutrition found that total cholesterol, LDL and triglycerides all fell in proportion to weight lost. The surprise was HDL: it dropped by about 0.007 mmol/L per kilogram while people were actively losing weight, then rose by about 0.009 mmol/L per kilogram once their weight had stabilised.
Two practical lessons. First, do not panic if your HDL looks worse on a blood test taken in the middle of a diet. Second, time your follow-up test for two to three months after your weight has settled, so you see the real result. Triglycerides are the marker most tied to excess calories and visceral fat, and they usually respond first when you tackle belly fat after 35.
Myth versus evidence
| Myth | What the evidence says |
|---|---|
| “If I exercise enough, I will never need medication.” | Genetics accounts for roughly 75 to 85 percent of LDL, and training lowered LDL by about 5 percent in a pooled analysis. Exercise does more for HDL, triglycerides and fitness than for LDL. |
| “Only heavy lifting changes cholesterol.” | Moderate loads (45 to 55 percent of one-rep max) matched heavy loads for LDL, and intensities above 85 percent were no more effective. Volume matters more. |
| “Walking does nothing for cholesterol.” | HDL responds at low to moderate doses with a roughly linear dose response. LDL needs more intensity or energy, so walking is the base, not the whole plan. |
| “My HDL dropped on my diet, so the diet is wrong.” | HDL falls slightly during active weight loss and rises once weight stabilises. Retest after, not during. |
| “Oats for cholesterol is marketing.” | Twenty-eight randomised trials: 3 grams a day of oat beta-glucan lowers LDL by 0.25 mmol/L. |
| “A normal LDL means I am fine.” | LDL measures cholesterol mass, not particle count. ApoB counts particles and is most useful with high triglycerides, diabetes or a family history. |
| “Cholesterol is a problem for people over 50.” | Testing is recommended from age 20, every four to six years at low risk. Risk comes from years of exposure, so the thirties and forties are when prevention pays most. |
When to talk to your doctor about medication
Targets depend on your risk. The cardiology guidance quoted by NewYork-Presbyterian sets LDL under 100 mg/dL for most people, under 70 mg/dL with diabetes and under 55 mg/dL after a heart attack. Where you sit against those targets, plus your blood pressure, family history, smoking status and ApoB, shapes the decision.
If you want to try lifestyle first, that is reasonable. Dr Bradley gives patients around six months of diet and exercise before revisiting medication. Statins are the usual first option; non-statin therapies exist for people who do not tolerate them or who need more. As he puts it, needing medication should not feel like a personal failure. Many fit, active people have high LDL for genetic reasons, and training hard while ignoring a very high number is not a trade-off that works in your favour.
A note for women: the HDL cut-off is higher for women: below 50 mg/dL (1.3 mmol/L) counts as poor, compared with 40 mg/dL for men. The exercise and fibre evidence above applies to both sexes, and several of the lifting trials were done in women. If you are approaching perimenopause and your numbers shift, talk to your doctor about what is driving the change.
Safety note: if you have known heart disease, chest pain, very high LDL (190 mg/dL or 4.9 mmol/L and above), very high triglycerides, or you are starting intense intervals for the first time after years of inactivity, get your doctor’s go-ahead before pushing intensity. Build the harder sessions in gradually, and never stop a prescribed medication because your training is going well.
FAQ
How much can exercise lower LDL cholesterol?
Modestly. A pooled analysis of 51 training studies found an average LDL drop of about 5 percent, with total cholesterol unchanged. Higher-intensity programmes did better: one trial at 80 percent of VO2 max lowered LDL by about 0.5 mmol/L (20 mg/dL) over 24 weeks. Exercise does more for HDL and triglycerides than for LDL.
Does walking lower cholesterol?
Walking raises HDL once your weekly volume is high enough, because HDL responds to total energy spent at low to moderate intensity. It does less for LDL. Use walking as your daily base and add two or three faster sessions plus lifting if you want the full effect.
How long before exercise shows up on a blood test?
Most of the trials in the review ran 8 to 24 weeks, and the pooled analysis only included programmes of at least 12 weeks. Give a new routine three months before you retest, and wait until your weight has been stable for a few weeks so the HDL reading reflects your new normal.
Should I ask for an ApoB test?
A cardiologist quoted in our sources suggests everyone gets ApoB measured once. It is especially worth asking for if heart disease runs in your family, your triglycerides are high, you have diabetes, or your LDL result does not match your overall risk picture.
Is it safe to exercise with high cholesterol?
For most people, yes, and it is part of the treatment. High cholesterol itself does not cause symptoms during exercise. If you have very high numbers, existing heart disease or symptoms such as chest pressure or breathlessness out of proportion to effort, see your doctor before adding intense sessions.
Free tool: find the heart-rate range for your steady sessions with our Zone 2 Heart Rate Calculator, then see what a decade of consistent habits adds up to with Future You.
Sources
- Mann S, Beedie C, Jimenez A. Differential Effects of Aerobic Exercise, Resistance Training and Combined Exercise Modalities on Cholesterol and the Lipid Profile: Review, Synthesis and Recommendations. Sports Medicine, 2014.
- Whitehead A, Beck EJ, Tosh S, Wolever TMS. Cholesterol-lowering effects of oat beta-glucan: a meta-analysis of randomized controlled trials. American Journal of Clinical Nutrition, 2014.
- Dattilo AM, Kris-Etherton PM. Effects of weight reduction on blood lipids and lipoproteins: a meta-analysis. American Journal of Clinical Nutrition, 1992.
- Mayo Clinic. Cholesterol test: results and what they mean. MayoClinic.org, accessed 2026.
- Morrill J, Bradley C. Understanding Your Cholesterol Numbers and What They Mean for Your Heart. NewYork-Presbyterian Health Matters, 2025.
This article is for general education and is not medical advice. Check with your doctor before starting a new training or nutrition plan, especially if you have a health condition.
