Cholesterol explained: Eggs, blood tests and what really drives risk

Confused about cholesterol? Learn what your blood test really shows, whether eggs are a problem and what actually drives cardiovascular risk.

Some things in nutrition seem to remain in the public consciousness for years, despite contrary evidence. Eggs are one of these – only this week I was asked if eggs should be avoided or limited due to their cholesterol.

So, are eggs the problem?

Short answer: for most people, no.

Longer answer: it’s a little more interesting than that.

Cholesterol has been cast as the dietary villain for decades, yet biologically it’s anything but. It is a type of fat which is essential to our health. Every cell membrane in your body relies on it, it’s the raw material for hormones like oestrogen and testosterone and it plays a vital role in brain function and vitamin D production.

We don’t actually need to eat it as our liver makes the majority of it but it is found in some foods, including eggs, animal fats and cheese.

Should we limit cholesterol from food?

Concern about eggs largely comes from long-standing advice to keep dietary cholesterol below about 300 mg per day — roughly the amount in one to two eggs.

However, this specific cap has now been removed from major dietary guidance. Research showed that, for most people, dietary cholesterol has a relatively small effect on blood cholesterol levels. The body regulates its own production, adjusting how much it makes depending on intake.

This doesn’t mean dietary cholesterol is irrelevant, but the focus has shifted away from a single number and towards overall dietary pattern and metabolic health.

In practice, that means looking at the bigger picture: fibre intake, blood sugar balance, inflammation, physical activity, sleep and hormonal changes — all of which influence cardiovascular risk far more meaningfully than whether you had eggs for breakfast.

What about eggs?

Most large eggs contain around 180–200 mg of cholesterol, yet studies generally find that eating eggs in moderation does not increase cardiovascular risk in healthy individuals. For many people, they improve satiety, protein intake and overall diet quality.

Who might need to be more cautious?

There are a few situations where intake may still need individual consideration:

• Familial hypercholesterolemia which is an inherited condition that reduces the body’s ability to clear LDL cholesterol from the blood. People with this disorder typically have very high LDL levels from a young age and a higher lifetime risk of heart disease, regardless of lifestyle.

• Type 2 diabetes or significant insulin resistance

• Existing cardiovascular disease

• Very high LDL levels

  
  

In these cases, the overall dietary pattern and metabolic health matter more than a strict cholesterol number, but personalisation is key.

Rather than a universal ceiling, the current thinking is: focus on overall dietary pattern, fibre intake, metabolic health and lifestyle — not a single cholesterol figure from food.

What does a blood test show?

A cholesterol blood test is like a snapshot of how your body is producing, transporting and recycling cholesterol.

Total cholesterol This is the overall amount of cholesterol in your blood, but on its own it doesn’t tell us very much about risk.

LDL (low-density lipoprotein) — the delivery particles LDL carries cholesterol from the liver out to tissues where it’s needed for repair, hormone production and cell function. It often gets labelled “bad” as higher levels can be associated with increased cardiovascular risk. But what matters is how it’s behaving within the wider metabolic picture.

HDL (high-density lipoprotein) — the recycling system HDL helps transport excess cholesterol back to the liver for reuse or removal. Higher levels are generally associated with better metabolic health, as this reflects efficient recycling.

Triglycerides These are a type of fat in the blood that rise when we’re regularly taking in more energy — particularly from refined carbohydrates — than the body immediately needs. They’re a useful clue about blood sugar balance and insulin sensitivity.

Sometimes additional testing looks at LDL particle characteristics, which can provide more insight into metabolic health.

Risk is about context, not one number.

Typical UK reference ranges

Reference ranges can vary depending on individual risk factors, but general guide values are:

Total cholesterol: ideally below 5 mmol/L

• 5–6.8 mmol/L: considered elevated

• Above 6.8 mmol/L: high

LDL: typically below 3 mmol/L

HDL: above 1.0 mmol/L in men

Above 1.2 mmol/L in women

Why the balance between markers matters

Clinicians usually interpret cholesterol results by looking at the relationship between markers rather than focusing on total cholesterol alone.

For instance, a person with moderately raised total cholesterol but relatively high HDL and lower LDL may be considered at lower risk than someone with a similar total cholesterol but lower HDL and higher LDL.

This is why cholesterol results are best viewed within the wider context of metabolic health, lifestyle and individual risk factors.

Understanding risk factors

Science has moved beyond the idea that cholesterol is simply “good” or “bad.”

When LDL particles are exposed to oxidative stress and inflammation, they are more likely to contribute to plaque build-up within artery walls. Lifestyle factors such as diet quality, physical activity, smoking, body composition and metabolic health all influence these processes.

This is why elevated cholesterol is considered a risk marker for cardiovascular conditions such as heart disease and stroke, rather than a standalone cause.

Risk increases further when multiple factors overlap — for example high blood pressure, insulin resistance, obesity or Type 2 diabetes — highlighting the importance of looking at overall metabolic health rather than a single number.

Why cholesterol often rises in midlife

Many people, particularly women, notice their cholesterol levels increase in their 40s and 50s, even if their diet hasn’t changed.

One of the main reasons is hormonal. Oestrogen helps regulate how the liver processes cholesterol, including how efficiently LDL is cleared from the bloodstream. As oestrogen levels fall during menopause, LDL levels often rise and HDL may shift.

Changes in body composition, insulin sensitivity and muscle mass can also play a role. This means a rise in cholesterol at this stage of life is often physiological rather than purely lifestyle-driven — and it’s one reason results need to be interpreted in context rather than in isolation.

What I look at beyond standard cholesterol numbers

When interpreting cholesterol, I don't focus on a single figure. The metabolic environment those numbers sit within is far more informative.

Insulin resistance — a major driver of higher triglycerides and lower HDL

Chronic inflammation — influences how cholesterol behaves in the body

Muscle mass — important for metabolic health and insulin sensitivity

Physical activity — improves lipid markers and cardiovascular health

Hormonal changes — particularly the drop in oestrogen in midlife

Taken together, these factors provide a much clearer picture of risk than cholesterol alone.

Why your overall diet matters most

For many years, public health messaging focused heavily on reducing fat and dietary cholesterol. One unintended consequence was a rise in more processed, lower-fat products that often contained more refined carbohydrates and added sugars.

We now understand that overall dietary pattern — rather than a single nutrient — has a far greater influence on cholesterol and cardiovascular risk. Diets rich in whole foods, fibre, healthy fats and minimally processed ingredients are consistently associated with more favourable lipid profiles.

In practice, this means prioritising simple, home-cooked meals built around vegetables, quality protein, whole-food carbohydrates and unsaturated fats such as olive oil.

In other words, cholesterol health is shaped far more by the pattern of what we eat than by whether we include specific foods like eggs or prawns.

Practical takeaways

If you want to support healthy cholesterol, the focus should be on daily habits rather than single foods.

• Prioritise fibre, particularly soluble fibre from oats, beans, lentils, flax and vegetables which can help escort old cholesterol from the bowels for excretion.

• Include omega-3 fats such as oily fish (salmon, mackerel, anchovies, sardines and herring) or plant sources from walnuts, chia and flaxseeds

• Strength train regularly to improve insulin sensitivity and lipid metabolism

• Keep blood sugar steady with balanced meals containing protein, fibre and healthy fats

• Support sleep and stress regulation, both of which influence inflammation and metabolic health

  
  

The encouraging part is that many of these factors are modifiable.

Think patterns, not single foods.

Where do statins fit in?

For some people, lifestyle changes alone aren’t enough to bring cholesterol into a safer range. Medications such as statins work by reducing the liver’s production of cholesterol and are widely used to lower cardiovascular risk.

They can be particularly helpful for those with existing cardiovascular disease, very high LDL levels, or genetic conditions such as familial hypercholesterolaemia.

Lifestyle factors including diet, movement, sleep and metabolic health remain important whether or not medication is prescribed, as they support overall cardiovascular health alongside medical treatment.

When to seek personalised advice

It can be helpful to look more closely at cholesterol results if:

• Levels are persistently elevated

• You have a strong family history of heart disease

• You’ve been advised to consider medication

• You want to understand what’s driving your numbers

A personalised approach can help identify the underlying factors and decide what changes, if any, are most appropriate.

A final word

Cholesterol has been framed as something to fear for decades, yet in reality it’s simply a marker — one piece of information within the wider context of how your body handles fats.

Understanding what sits behind the numbers is far more powerful than trying to eliminate specific foods or chase a single target.

When you zoom out and support the systems that influence cholesterol — metabolism, muscle, hormones and lifestyle — the conversation shifts from restriction to resilience.

If you’ve recently had your cholesterol checked and would like help understanding what the results mean in the context of your lifestyle, hormones and health history, you’re very welcome to book a free discovery call here to discuss your next steps.