Keto and High Cholesterol: Is a Low-Carb Diet Bad for LDL? What to know before cutting carbs if your cholesterol is raised
- The Cholesterol Coach
- Nov 10, 2025
- 7 min read
If you have ever searched for ways to lose weight or improve blood sugar, you have probably come across low-carb or keto diets.
They are often presented as simple, quick and effective.
Cut carbs.
Eat more fat and protein.
Lose weight.
Improve blood sugar.
Feel more in control.
And for some people, low-carb diets can lead to weight loss or improvements in blood sugar.
But if your cholesterol is raised, especially your LDL cholesterol, it is worth being cautious.
Because some people see their LDL cholesterol rise on low-carb or keto diets, sometimes quite significantly.
That does not mean every lower-carb approach is automatically harmful.
But it does mean that if you already have high cholesterol, the type of fat you eat, the amount of fibre you get, and your blood test results really matter.
Quick answer: can keto raise cholesterol?
Yes, keto and very low-carb diets can raise LDL cholesterol in some people.
This is more likely when the diet is high in saturated fat from foods such as butter, cream, cheese, coconut oil, fatty meats and processed meats, and low in fibre-rich foods such as oats, barley, beans, lentils, fruit and wholegrains.
The NHS advises people with high cholesterol to cut down on foods high in saturated fat and choose foods containing healthier unsaturated fats instead. It also recommends eating more fibre and exercising more.
So if a keto diet increases saturated fat and reduces fibre, it may work against the main dietary changes usually recommended for LDL cholesterol.
What is a keto diet?
A ketogenic diet is a very low-carbohydrate, high-fat eating pattern.
Carbohydrates are usually reduced dramatically, often to around 20 to 50g per day, although approaches vary.
This usually means cutting back on foods such as:
bread
pasta
rice
potatoes
oats
many fruits
beans
lentils
some vegetables
most sugary foods
Fat and protein then make up a much larger part of the diet.
This can include foods such as meat, eggs, cheese, butter, cream, oils, nuts, avocado and fish.
When carbohydrate intake is very low, the body starts producing ketones, which can be used as an alternative fuel source.
That is where the name “keto” comes from.
Why keto can look appealing
I understand why people are drawn to it.
If you have been struggling with weight, cravings, blood sugar or feeling out of control around food, a low-carb plan can feel very clear.
There are rules.
There is a defined structure.
And often, people see quick changes on the scales at the start.
That initial weight loss can feel motivating.
Some people also report feeling less hungry or having fewer cravings.
So this is not about judging anyone for trying it.
It is about asking a different question: Is this approach supporting your heart health as well as your weight?
Because those are not always the same thing.
Why LDL cholesterol can rise on keto
LDL cholesterol is often called “bad cholesterol”, although that phrase is oversimplified.
The reason LDL matters is that higher LDL cholesterol can contribute to fatty build-up in the artery walls over time, increasing the risk of heart disease and stroke.
Low-carb and keto diets can affect LDL cholesterol in different ways depending on what someone actually eats.
A keto diet built around olive oil, nuts, seeds, avocado, oily fish, tofu, low-starch vegetables and careful saturated fat choices is very different from one built around butter, cheese, cream, bacon, sausages and coconut oil.
The problem is that many popular keto plans lean heavily on foods high in saturated fat.
And saturated fat can raise LDL cholesterol for many people.
The British Heart Foundation explains that saturated fats increase non-HDL cholesterol, and that eating too much saturated fat can increase the amount of cholesterol in your blood.
So even if weight is coming down, LDL cholesterol may still rise if saturated fat intake is high.
Weight loss is not the whole picture
This is one of the most important points.
A diet can help you lose weight and still not be ideal for your cholesterol.
That can feel confusing, because weight loss is often talked about as universally heart-healthy.
And yes, for some people, gradual weight loss can support cholesterol, blood pressure, blood sugar and overall risk.
But the method matters.
If weight loss comes from a diet that is high in saturated fat and low in fibre, your LDL cholesterol may not improve in the way you expect.
Some people even see LDL rise despite losing weight.
So the question is not only: “Did this diet help me lose weight?”
It is also: “What happened to my LDL cholesterol, non-HDL cholesterol and overall heart-health markers?”
When cutting carbs means cutting fibre
Another concern with very low-carb diets is that they can remove many foods that support cholesterol.
Foods such as oats, barley, beans, lentils, chickpeas, fruit and wholegrains contain fibre, including soluble fibre.
Soluble fibre can help reduce cholesterol absorption in the gut and support cholesterol removal.
The British Heart Foundation highlights eating more fibre as one of the dietary changes that can help cholesterol, and HEART UK includes oats and barley as key cholesterol-lowering foods because they contain beta-glucan.
When someone cuts out oats, beans, lentils, fruit and wholegrains, they may lose a major cholesterol-supporting tool.
Carbohydrates are not all the same.
A biscuit and a bowl of oats are not doing the same job in your body.
White bread and lentils are not the same.
A sugary drink and chickpeas are not the same.
So rather than asking, “Should I cut carbs?”, it is often more useful to ask: Which carbohydrate foods are helping my heart health, and which ones are not serving me well?
The problem with “clean keto”
Another reason this topic is confusing is that keto is often marketed as “clean eating”.
People may be eating fewer processed foods and cooking more from scratch, which can feel like a positive step.
But “clean” does not automatically mean cholesterol-lowering.
A meal can look wholesome and still be high in saturated fat.
For example:
coffee with butter or cream
coconut oil in smoothies
cheese-heavy meals
bacon and eggs cooked in butter
creamy sauces
fatty cuts of meat
low-carb baking made with coconut oil and large amounts of fat
These may fit keto rules.
But they may not fit a cholesterol-lowering approach.
For LDL cholesterol, the type of fat matters more than whether the meal looks “clean”.
Are all low-carb diets bad for cholesterol?
No.
This is where nuance matters.
Not every lower-carb approach is the same.
Some people reduce refined carbohydrates and sugary snacks while still eating plenty of vegetables, beans, lentils, nuts, seeds, fruit and unsaturated fats.
That can be very different from a strict ketogenic diet.
A moderate carbohydrate approach that focuses on fibre-rich, minimally processed foods may work well for some people, especially if they are managing weight, blood sugar or appetite.
The issue is usually not “lower carb” in itself.
The issue is when lowering carbs leads to:
higher saturated fat
lower fibre
fewer plants
less variety
more processed meats
fewer cholesterol-lowering foods
a pattern that is hard to maintain
So if you prefer fewer carbohydrates, the aim should be heart-health-first lower carb, not high-saturated-fat keto.
What to focus on instead
If your cholesterol is raised, a more heart-supportive approach usually includes:
more soluble fibre from oats, barley, beans, lentils, fruit and vegetables
better fat quality from olive oil, rapeseed oil, nuts, seeds, avocado and oily fish
less saturated fat from butter, cream, large cheese portions, fatty meats, processed meats and coconut oil
enough protein to feel satisfied
plenty of plants
gradual weight loss, if appropriate
regular movement
alcohol awareness
consistency over time
This does not mean you need to eat a very high-carbohydrate diet.
It means the carbohydrates you do eat should work harder for your heart health.
A better question than “keto or not keto?”
Many people ask:“Should I do keto?”
But I think a better question is: “What eating pattern supports my cholesterol, weight, blood sugar, energy and life in a way I can keep?”
Because health is not just one marker.
You may want weight loss.
You may want better blood sugar.
You may want lower cholesterol.
You may want better energy.
You may want to feel calmer around food.
Those goals need to work together.
If one diet improves one number but worsens another, it may not be the best long-term approach for you.
Want help choosing a heart-health-first approach?
If you have raised cholesterol and feel unsure what to eat, there are three ways I can help.
If you want practical heart-healthy meals
Start with The Heart-Healthy Recipe Book.
It includes over 100 heart-healthy recipes, available in digital or printed format, with doctor’s tips explaining why the ingredients support cholesterol and overall heart health.
This is a good next step if you want meals that support cholesterol without feeling restrictive or bland.
If you want a clear 12-week structure
The Heart-Healthy Living Course is the best fit if you want to move away from extreme dieting and build a sustainable plan for cholesterol and long-term heart health.
It guides you through food, fibre, fats, movement, alcohol, sleep, stress, weight and mindset, with the heart-healthy recipe collection included.
If you want personalised support
If you have tried keto, low-carb or other diets before and feel unsure what is right for your cholesterol, 1:1 coaching may be the better fit.
This can be especially helpful if you are balancing cholesterol, weight, blood sugar, menopause, IBS, medication questions, eating out, alcohol habits or all-or-nothing thinking.
Together, we can look at your results, preferences and health history, then build a personalised plan that supports your heart without dragging you back into another diet cycle.
Final thought
Keto and low-carb diets can be tempting because they feel clear and decisive.
But if your cholesterol is raised, clarity alone is not enough.
The plan also needs to support your LDL cholesterol, non-HDL cholesterol, fibre intake, fat quality and long-term heart health.
You do not need to fear carbohydrates.
You do not need to eat perfectly.
And you do not need to go back to another diet that makes one part of your health better while potentially making another part worse.
You need an approach that supports the whole picture.
Your heart included.
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