Here is a pattern most people recognise: eat breakfast (toast, cereal, juice), feel fine for 90 minutes, then hit a wall of tiredness and hunger by mid-morning. Eat something, feel better, then crash again before lunch. This repeats all day.
This is not normal. This is the glucose-insulin roller coaster, and it is the central mechanism behind both fat storage and the relentless hunger that makes dieting feel impossible.
What Happens When You Eat Carbohydrates
When you eat carbohydrates, they are broken down into glucose and absorbed into the bloodstream. Blood glucose rises. The pancreas detects this rise and releases insulin — a hormone whose primary job is to move glucose out of the bloodstream and into cells.
Insulin works fast. Glucose is cleared from the blood, sometimes too aggressively. Blood sugar drops. The brain — which is glucose-dependent when you are not adapted to burning fat — detects the drop and triggers hunger signals. You eat again. The cycle repeats.
The faster the carbohydrate is digested, the sharper the spike and the harder the crash. Refined sugars and grains are at the top of this list. The roller coaster runs on them.
Why This Matters for Fat Burning
Insulin does not just move glucose into cells. It also prevents the release of fatty acids from fat tissue. As long as insulin is elevated, fat burning is blocked. You simply cannot access stored fat as fuel when insulin is high.
On a standard Western diet — three high-carbohydrate meals plus snacks — insulin is elevated for most of the waking day. The body spends very little time in a state where fat burning is possible. The few hours of potential fat burning that occur during sleep and the early morning are quickly interrupted by the first meal of the day.
This is why people on high-carb diets find it almost impossible to lose fat through exercise alone. The fat stores are chemically locked while insulin is circulating.
The Insulin Resistance Complication
Chronic exposure to high insulin levels causes cells to become less responsive to insulin over time — a condition called insulin resistance. When cells resist insulin, the pancreas compensates by producing more. Insulin levels stay high, fat burning stays blocked, and the cells still do not receive enough glucose efficiently.
As a pharmacist, I saw the end stages of this progression regularly: type 2 diabetes, metabolic syndrome, fatty liver, cardiovascular disease. These are not random conditions. They are the downstream consequences of the glucose-insulin roller coaster running unchecked for years.
Breaking the Cycle
The most direct way to stop the roller coaster is to remove the fuel that drives it: dietary carbohydrates, particularly refined ones.
When carbohydrate intake is low enough, blood glucose remains stable. Insulin stays low. The body has no choice but to access fat stores for fuel. Hunger becomes manageable because blood sugar is no longer spiking and crashing every two hours.
The first week of this transition is the hardest. The body has been running on glucose for years and switching to fat metabolism takes time. This is the adaptation period. What follows it — stable energy, reduced hunger, and efficient fat burning — is what the body was designed for all along.
A Practical Note
If you want to see the roller coaster in action, skip breakfast one morning and observe what happens to your hunger over the following three hours. On a high-carb diet, hunger becomes intense. The absence of a glucose spike creates a signal of emergency.
On a fat-adapted ketogenic diet, skipping a meal creates no such crisis. The body simply switches to burning its own fat stores. This is the difference between a metabolically flexible system and one trapped on the roller coaster.
Getting off the roller coaster is the starting point. Everything else in the NKFB protocol builds from here.
