Cholesterol FAQs: Your Questions Answered

Updated July 2026

There's a lot of confusion around cholesterol. Here are clear answers to the most common questions I get, from what the numbers mean to how to actually lower them. For the big-picture overview, start with Understanding Cholesterol: What Everyone Gets Wrong.

What Are Normal Cholesterol Levels?

Normal results vary by age and sex. Here's a summary (values in mg/dL):

	Total	HDL	LDL	Triglycerides	Non-HDL
Children (≤19 yr)	<170	>45	<110	<75 under age 10; <90 ages 10–19	<120
Men (20+)	125–200	≥40	<100	<150	<130
Women (20+)	125–200	≥50	<100	<150	<130

Many clinicians who specialize in cholesterol would argue these “normal” numbers are still too lax, especially for LDL. To put it in perspective, all mammals share the same cholesterol biochemistry we do, and the average LDL in other mammalian species is around 35–70 mg/dL. How to read your panel.

How Is Cholesterol Measured?

With a simple blood test. A typical panel reports total cholesterol, HDL (“good”), LDL (“bad”), and triglycerides. In most cases only total, HDL, and triglycerides are actually measured, and LDL is calculated with a formula — which becomes inaccurate when triglycerides are very high (over 400), at which point LDL must be measured directly. Two other numbers sometimes appear: “non-HDL” (total minus HDL) and a “cholesterol ratio” (total divided by HDL), both used to gauge whether there's enough good cholesterol to offset the bad.

What Are Triglycerides?

Triglycerides are fatty particles that transport excess calories around, and they don't actually contain much cholesterol — which is why the LDL formula divides them by five. They're less a direct heart-disease risk factor and more of an indicator of overall metabolic health, and because they carry calories around, they're the most nutrition-sensitive and variable number on your panel.

What Is a Normal Triglyceride Level?

Under 150 mg/dL, but they sit on a completely different scale from HDL and LDL. The lowest I've seen (off medication) was 27; the highest, over 3,000. So although everyone should cluster under 150, the possible range is huge, which means an absolute change in triglycerides is far less exciting than the same change in LDL or HDL would be. Very high levels (especially over 1,000) are often genetically driven and raise the risk of pancreatitis — a painful inflammation of the pancreas — so those patients are usually put on medication to prevent it. Otherwise, triglycerides are treated as a secondary target, as part of the overall LDL plan.

What Causes High Cholesterol?

Multiple things: genetics, physical inactivity, excess weight, and — most importantly — poor diet. Genetics alone are rarely the whole story; even when high cholesterol is genetically driven, lifestyle factors usually coexist and make the numbers worse, sometimes markedly. The full biochemistry.

What Foods Are High in Cholesterol?

Eggs, shellfish, organ meats, fried and fast foods, processed meats, cheese, and butter. With the exception of shellfish, dietary cholesterol is mostly animal-based. But it's not the cholesterol in food that mainly determines your blood cholesterol — read on.

What Are the Worst Foods for High Cholesterol?

Most people assume it's the cholesterol-containing foods, but that's not the case; you'd have to gorge on a mound of plain shrimp to move your LDL much. It's the overall composition of a food that matters, especially its saturated fat and simple-carb content. Saturated fats (solid at room temperature — butter, cheese, the marbling in beef, chicken fat, egg yolks) are fairly neutral for HDL and triglycerides but, in some people, are potent LDL raisers. I've seen LDLs climb dramatically on the keto diet, which is very high in saturated fat. Simple, processed carbs — white bread, white rice, white pasta, cakes, cookies, anything with added sugar or white flour — are big cholesterol raisers too. Which fats help and which hurt.

How Do Simple Carbohydrates Raise Cholesterol?

Carbs are naturally fat- and cholesterol-free, so this surprises people. But all carbohydrates are absorbed as sugar, and simple, processed carbs are digested fast, spiking blood sugar and then insulin. As a simplification, think of insulin as a storage hormone that pushes your biochemistry into storage mode. The storage form of cholesterol? LDL — so it goes up. The non-storage form? HDL — so it goes down. The storage form of excess calories? Triglycerides — up, often way up. End result: a worse profile across the board.

How Do You Lower Cholesterol?

Almost anything that improves your health helps: more exercise, weight loss, less stress, quitting smoking, and better diet. Of all of them, improving diet has the greatest potential to reward you with the biggest drop.

How Do You Lower Cholesterol With Diet?

By fixing the two culprits above — but not in the way people often assume. Lowering cholesterol does not mean a low-fat or low-carb diet. It means choosing healthy fats and healthy carbs instead of the harmful versions.

What Fats Help Lower Cholesterol?

Unsaturated fats — liquid at room temperature, mostly from plants: olive oil, the oils in nuts, seeds, and avocados, and the oils in fish. They lower LDL in most people (neutral at worst), and as a bonus they raise HDL and lower triglycerides.

What Carbohydrates Help Lower Cholesterol?

Complex, unprocessed carbs — in other words, consume carbohydrates in as close to their original form as possible. Steel-cut oats, not puffed oat cereal; an apple, not applesauce or juice. In their original form they're hard to digest and high in fiber and plant sterols, so they're absorbed slowly, blood sugar doesn't spike, insulin doesn't spike, and you avoid that counterproductive storage mode.

How Does Fiber Help Lower Cholesterol?

Through your body's natural cholesterol-recycling system. Every time you eat, bile is squeezed into the digestive tract to help digestion — and bile is cholesterol-rich, made from circulating cholesterol. To keep enough bile at the ready for the next meal, your body either pulls cholesterol from the blood to make more, or reabsorbs the bile it didn't use. Fiber “wastes” bile: it binds bile and carries it out before the bile can be reabsorbed, so your liver has to pull more cholesterol from your blood to make the next batch — and LDL drops.

How Do Plant Sterols Help Lower Cholesterol?

Plant sterols are the plant version of cholesterol, and they leverage the same bile system in a different way. They're similar enough to bile cholesterol that the body tries to reabsorb them, but different enough structurally that they get stuck in and block those bile absorption sites — so more bile is wasted and LDL drops. Between fiber and plant sterols, you can start to see the rationale behind how Step One Foods is built.

Why Is Lowering LDL Cholesterol Important?

Because LDL is tightly correlated with heart-disease risk — nearly a straight-line relationship between LDL level and plaque buildup, particularly when LDL stays elevated for years. Heart disease is multifactorial, so LDL matters more or less depending on your other risk factors, but in general, if your goal is to avoid heart disease (or another heart event), lower LDL is better.

What Is a Normal LDL Level?

It depends on your risk. In general, most people should have an LDL under 100, those with added risk factors (or existing heart disease or diabetes) under 70, and the highest-risk patients — those who have already experienced a heart event — under 55. The reasoning: at around 100, plaque deposition slows markedly; at 70 it essentially stops; and under 55 you can start to see plaque actually regress. The tradeoff is that getting below 55 usually takes high-dose or multiple medications. For some perspective on these LDL targets: other mammals (who share our exact cholesterol pathways) run LDLs of 30–55, and we're born with LDLs in that range. The full LDL target ladder.

Can LDL Levels Ever Be Too Low?

In short, no. Your cells make their own cholesterol, so you can't run out. The cholesterol needed to make hormones comes largely from HDL. People genetically blessed with lifelong LDLs in the 30s have no excess risk of any illness, cancer, or dementia — and almost never develop heart disease — and they still make plenty of bile.

Does a High HDL Make Up for a High LDL?

Not necessarily. If your total is high only because HDL is high, that elevated total is much less worrisome. But if your LDL is high, a high HDL doesn't fully cancel it out — we treat them as separate risk factors. When it's unclear whether someone needs a statin, I'll often use a coronary calcium scan as the tie-breaker. More on HDL.

Does Everyone With a High LDL Need a Statin?

Not necessarily. High cholesterol is only one risk factor, and treatment has to be weighed against the health of the whole person. People who clearly should be on a statin include those with known cardiovascular disease, diabetes, or familial hypercholesterolemia (LDL over 190 regardless of lifestyle). For everyone else, lifestyle — especially diet — should be tried first, and a coronary calcium scan can help decide before committing to a lifelong medication. Who should be on a statin.

How Long Does It Take to Lower Cholesterol?

Medications work within days. But cholesterol also responds quickly to diet — in tightly controlled studies where every morsel was measured, LDL fell to its lowest attainable level within about two weeks, and in the real world, Step One Foods has produced meaningful reductions in most people after just 30 days. That's a starting point, not a ceiling: losing weight, getting fitter, and expanding your dietary efforts keep paying off over time.

If I Take a Statin, Do I Still Need to Pay Attention to Diet?

Yes — absolutely. It's a common myth that a pill lets you stop watching what you eat. If anything, going on a statin (or any cholesterol lowering drug) means paying attention to diet is even MORE important, not less. Eating well means you'll need lower medication doses to hit your goal, and for any given cholesterol reduction, risk drops more when it's achieved through the combination of diet and medication. Diet also lowers blood pressure, improves blood sugar, and helps with weight — all independent heart-disease risk factors. We put people on medication to reduce downstream risk, not to make a number look perfect, and drugs can only go so far. What you eat, weigh, and do are yours alone to control — never rely on a drug to be the whole answer. Because it isn't.