Most of us know that too much sugar isn’t great. But the full picture — what glucose and fructose actually do inside the body, organ by organ — is far more alarming than a dentist’s warning. And far more reversible than most doctors let on.
Your Gut Is Talking to Your Brain
Scientists are discovering that gut health is directly linked to mental health. An unhealthy microbiome can contribute to mood disorders. The gut and the brain are connected by 500 million neurons, constantly sending information back and forth — which is why what we eat, and whether we experience glucose spikes, affects how we feel.
This connection is more than anecdotal. It’s wired in.
How Glucose Spikes Cause Heart Disease
The mainstream understanding of heart disease is overdue for an update. Here’s what’s actually happening:
Step 1 — Damaged blood vessels. The lining of our blood vessels is made of cells that are particularly vulnerable to mitochondrial stress. Glucose and fructose spikes trigger oxidative stress in these cells, causing them to lose their smooth shape. The vessel lining becomes bumpy, and fat particles get stuck along the uneven surface.
Step 2 — The wrong kind of cholesterol. When insulin levels run too high, the liver starts producing LDL pattern B — a small, dense form of cholesterol that creeps along the edges of vessels and is prone to getting caught. This is very different from LDL pattern A, which is large, buoyant, and harmless, and comes from eating dietary fat.
Step 3 — Plaque builds up. When that LDL pattern B gets oxidised — which happens the more glucose, fructose, and insulin are present — it lodges under the vessel lining and sticks. Plaque accumulates, blood flow is obstructed, and this is how heart disease starts.
The Problem with How We Diagnose It
Nine out of ten doctors still measure total LDL cholesterol to assess heart disease risk, and prescribe statins when it’s too high. But statins lower LDL pattern A — the harmless kind — not the problematic pattern B. This is why statins don’t decrease the risk of a first heart attack.
What doctors should be measuring instead:
- Triglycerides-to-HDL ratio — triglycerides become LDL pattern B in the body, so this ratio is surprisingly accurate at predicting LDL particle size. A ratio below 2 (in mg/dL) is ideal; above 2 is concerning.
- C-reactive protein — a marker of inflammation, which is a key driver of heart disease and a better predictor than cholesterol levels.
Insulin and Fertility: A Hidden Link
The brain and the sex organs use insulin levels as a signal to decide whether the body is a safe environment for reproduction. If insulin is out of balance, the body becomes reluctant to conceive. Both men and women with high insulin levels are more likely to be infertile. The more glucose spikes in the diet, the higher the insulin levels — and the higher the incidence of infertility.
PCOS: A Disease of Too Much Insulin
One in eight women experience polycystic ovary syndrome (PCOS), in which the ovaries become burdened with cysts and stop ovulating. PCOS is caused by excess insulin. Here’s the chain of events:
- High insulin tells the ovaries to produce more testosterone
- It also hampers the natural conversion from male to female hormones
- The result is elevated testosterone, leading to symptoms like unwanted facial hair, baldness, acne, irregular periods, and the accumulation of eggs in the ovaries
The more insulin present, the more severe the PCOS symptoms.
How Type 2 Diabetes Develops
Type 2 diabetes now affects half a billion people worldwide, with numbers rising every year. It begins with something called insulin resistance.
When insulin levels stay high for a long time, the body’s cells gradually stop responding to it. The liver, muscle, and fat cells require ever-larger quantities of insulin to absorb the same amount of glucose. Eventually, the system breaks down entirely — glucose is no longer stored as glycogen, even as the pancreas produces more and more insulin. Blood glucose levels rise and stay elevated.
This progression moves from prediabetes (fasting glucose above 5.5 mmol/L) to type 2 diabetes (above 7.0 mmol/L). Every glucose spike, over many years, contributes to worsening insulin resistance.
Why More Insulin Isn’t the Answer
The common treatment for type 2 diabetes is to administer more insulin, which temporarily forces fat cells to absorb glucose — but also causes weight gain and, critically, leaves the root problem untouched. Higher and higher doses are prescribed, weight increases, but insulin levels remain dangerously elevated. It is a vicious cycle.
The Liver, Fructose, and a Disease We Didn’t Used to Have
In the late 2000s, endocrinologist Robert Lustig noticed something strange in his San Francisco practice: patients — some of them children under ten — were showing signs of liver disease without being heavy drinkers. His investigation led to a discovery: excess fructose causes liver disease in the same way alcohol does.
To protect us, the liver converts fructose into fat and removes it from the bloodstream — the same mechanism it uses for alcohol. But when we repeatedly eat foods high in fructose, the liver itself becomes fatty. This condition is now called non-alcoholic fatty liver disease (NAFLD), and it is startlingly common: one in four adults worldwide has it. Among people who are overweight, that figure rises to over 70 per cent. Left unchecked, NAFLD can progress to liver failure or cancer.
The reversal is straightforward in principle: reduce fructose intake, prevent further spikes, and give the liver the space to deplete its excess fat reserves. Since fructose and glucose go hand in hand in most foods, flattening glucose curves naturally reduces fructose spikes too.
Glucose Makes You Age Faster
Glucose spikes trigger a process called glycation — and glycation accelerates ageing at a cellular level.
When glycation acts on collagen, it makes it less flexible. Collagen is essential for wound repair and for maintaining healthy skin, nails, and hair. Damaged collagen leads directly to sagging and wrinkling. The more glycation, the more visible the ageing.
It doesn’t stop at skin. When glycation occurs in the eyes, damaged molecules clump together over time and form cataracts, gradually blocking out light.
The Common Thread
Across all of these conditions — heart disease, infertility, PCOS, type 2 diabetes, fatty liver disease, accelerated ageing — the same culprits keep appearing: glucose spikes, fructose, and chronically elevated insulin.
Research suggests that around 88 per cent of adults have dysregulated glucose levels and are experiencing the consequences without knowing it. The symptoms range from the everyday (cravings, brain fog, poor sleep, acne, migraines) to the serious (infertility, type 2 diabetes, heart disease). They feel normal because they’re common. But common is not the same as inevitable.
The science is now clear enough to act on: these conditions are not just explainable — they are largely reversible. And it starts with understanding what glucose is doing inside your body.
Source : Glucose Revolution: The Life-Changing Power of Balancing Your Blood Sugar by Jessie Inchauspé
Goodreads : https://www.goodreads.com/book/show/58438618-glucose-revolution
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