Rethinking Cholesterol and Brain Health

The Cholesterol Village

Cholesterol has become one of the most misunderstood substances in modern medicine. We are told it is dangerous, something to reduce, suppress, fear. Yet the human brain is nearly 60% fat, and cholesterol plays a crucial role in neuron structure, hormone signalling and repair.

In the context of cognitive decline and Alzheimer’s disease, understanding lipids is not optional—it is foundational.

Before we talk about memory, plaques in the brain, or risk factors, we need to understand the traffic system that moves fats through the body.

Let me introduce you to The Cholesterol Village.

The Cholesterol Village:

A Story About Traffic, Taxis, Trouble-Makers and the River of Life

Imagine your bloodstream as a vast, shimmering river flowing through the Kingdom of You.

Floating down this river are tiny boats carrying fat—because fat cannot travel alone in water. Oil and water don’t mix. Biology solved this problem by building lipoproteins: little protein-coated transport vessels.

And this is where the characters enter.

The Delivery Trucks — LDL (Low-Density Lipoprotein)

LDL is often called “bad cholesterol,” but that’s unfair branding. 

LDL’s job is simple: Deliver cholesterol from the liver to tissues.

Cholesterol itself is not evil. You need it to:

• Repair wall (cell membranes)

• Make hormones

• Produce vitamin D

• Create bile acids

  
  

Without cholesterol, you would not function.

But here’s the twist.

Trouble happens when:

• Too many trucks crowd the road.

• Roads are already damaged (inflammation).

• Cargo gets dropped and sticks to the roadside.

  
  

If there are too many LDL trucks on the road—especially small, dense, damaged ones — traffic builds up. They start parking along artery walls. Over time, this creates plaque. LDL is a delivery system. Overcrowding is the issue.

So, LDL isn’t evil. It’s just overenthusiastic when in excess.

The Clean-Up Crew — HDL (High-Density Lipoprotein)

HDL is the recycling van.

Its job:

Pick up excess cholesterol from tissues and artery walls and take it back to the liver for disposal or reuse.

That’s why HDL is often called “good cholesterol.”

Higher HDL generally means:Better cleanup capacity.

Think of it as a tidy village.

The more effective the clean-up crew, the less clutter accumulates.

Taxis– VLDL (Very Low-Density Lipoprotein and their passengers Triglycerides)

Here are your taxis.

VLDL (Very Low-Density Lipoprotein) are the small yellow taxis carrying triglycerides—energy parcels.

Triglycerides are not cholesterol at all.

They are stored energy.

When you eat more energy than you burn (especially sugars and refined carbs), the liver packages that excess into triglycerides and sends them out in VLDL taxis.

If there are too many taxis:

• Traffic thickens.

• LDL trucks change shape and become smaller and denser.

• Roads become more vulnerable.

  
  

If LDL is traffic, triglycerides are the warehouse overflow.

When triglycerides are high, LDL particles tend to become smaller and denser—more likely to sneak into artery walls.

Non-HDL Cholesterol — The Total Trouble Makers

Non-HDL cholesterol equals:All vehicles that can potentially deposit cargo in the roadside.

That includes:

• LDL trucks

• VLDL taxis

• Other remnant carriers

  
  

Doctors call them “atherogenic”—meaning capable of contributing to plaque.

Non-HDL simply counts:Every vehicle except the clean-up crew.

If HDL is the clean-up crew,Non-HDL is the count of vehicles that could cause congestion.

Total Cholesterol—The Village Headcounts

Total cholesterol counts:

All delivery trucks + all taxis + all recycling trucks combined.

It does not tell you who is helping or who is crowding.

That’s why total cholesterol alone can mislead.

A village with many clean-up trucks might still look “high” on paper.

The Ratio—The Balance Score

Total cholesterol ÷ HDL.

This ratio tells you:How much delivery traffic exists compared to clean-up capacity.

Lower ratio = strong balance.

Higher ratio = overwhelmed roads.

It’s not about eliminating traffic. It’s about harmony between delivery and removal.

The Memory Hook

If you forget everything else, remember this:

LDL delivers.HDL hauls away.

VLDL taxis carry fuel (triglycerides). Triglycerides store energy.

Non-HDL counts the risky delivery fleet.

Total cholesterol counts everyone.

The ratio tells you whether the village is in balance and if the clean-up keeps up.

Cholesterol is not good or bad. It is traffic management inside a living river.

The New Kid on the Block — ApoB (Apolipoprotein B)

Just when you think you know the village traffic system, someone new arrives with a clipboard.

Meet ApoB.

ApoB isn’t a truck.

It isn’t cargo.

It’s the badge every potentially troublesome vehicle must wear.

Every LDL truck carries one ApoB badge.

Every VLDL taxi carries one too.

Every remnant vehicle capable of dropping cargo along the roadside wears this same badge.

So ApoB does something clever.

It doesn’t measure how much cholesterol is flowing through the river.

It counts how many vehicles are on the road.

Imagine two villages:

In one, there are five large delivery trucks, each heavily loaded.

In another, there are fifty small vans, each lightly loaded.

Both might carry the same total cargo.

But which village has more traffic?

Which one has more chances for congestion?

ApoB tallies the troublesome vehicles.

More ApoB means more vehicles moving through the bloodstream — more chances for congestion.

LDL = how full the trucks are.

Non-HDL = total cargo in all the atherogenic vehicles.ApoB = number of vehicles themselves.

And sometimes, it’s the crowding that causes the trouble.

Thanks for reading

Mandy