The Insulin Loop
Every meal you eat draws a shape in your blood. Once you can see the shape, you can see why willpower keeps losing, what it costs over the years, and exactly what to change. Here is the loop, in plain language.
One meal. One cliff.
swipe the chart to see the whole day →
Blood sugar after a fast-sugar meal, in mg/dL: the spike carries you into the hyperglycemia zone, the over-correction drops you into the hypoglycemia zone. (140 mg/dL is 7.8 mmol/L; 70 is 3.9.)
The spike. Thirty to forty-five minutes in, sugar floods the blood faster than your body can use it, punching above the healthy ceiling.
The crash. Insulin over-corrects to clear it. Two hours later you are below where you started: shaky, foggy, and hungry again, even though you just ate.
In a small crossover study published in Pediatrics, twelve teenage boys reported more hunger and ate 81% more calories at the next meal after a high-glycemic meal than after a low-glycemic one of identical calories. It is a small study, and one worth reading as a signal rather than a law. But the direction matches what people describe every day: the crash is not weakness. It is chemistry doing what the meal told it to do.
Above the ceiling, below the floor
Above about 140 mg/dL (7.8 mmol/L) after a meal, or 100 mg/dL (5.6 mmol/L) fasting, sugar is arriving faster than your cells can take it in. In the hours after, that feels like thirst, extra bathroom trips, a heavy tiredness, headache, blurred vision and brain fog.
One visit above the ceiling is normal life. The trouble is the repeat business: spikes that land there several times a day, for years, quietly wear on blood vessels and nerves. That slow wear is exactly what the illness list further down this page tracks.
Below about 70 mg/dL (3.9 mmol/L), the brain sounds the alarm and adrenaline joins in. That feels like shakiness, sweating, a racing heart, irritability, anxiety, hunger and trouble concentrating. The 3pm hangry crash after a sugary lunch is the mild, everyday version of this chemistry.
True lows are most common in people on insulin or certain diabetes medications. If you get severe lows, with confusion, slurred speech or near-fainting, that is a same-week conversation with your doctor, not a coaching project.
Thresholds per the American Diabetes Association and Diabetes Canada guidelines. Where you personally feel symptoms varies; the pattern is what matters.
Why am I hangry? Two days. Two mountain ranges.
Same person. Same waking hours. The only difference is what was on the plate, and how many times a day a plate appeared at all.
A whole-food day
swipe the chart to see the whole day →
Three unhurried rises, no breach of the ceiling, no fall through the floor. The first meal lands at 11am because that is when hunger actually showed up.
An ultra-processed day
swipe the chart to see the whole day →
Same person. Same day length. Different food. Thresholds are 140 mg/dL (7.8 mmol/L) and 70 mg/dL (3.9 mmol/L). Curve shapes are illustrative of published CGM patterns; individual responses vary.
You would say you ate three meals. You ate nine times.
Ask almost anyone what they ate yesterday and you will hear three answers: breakfast, lunch, dinner. The coffee with two sugars does not get mentioned. Neither does the muffin at the desk, the handful from the jar, the bag of chips at 2pm, or the drive-thru on the way home. Those are not remembered as eating. They are remembered as nothing at all.
Your pancreas remembers all nine.
This is the part almost every diet misses. It obsesses over what is on the plate and ignores how often a plate appears. Yet when researchers took apart thirty years of national food data to find out where the extra calories came from, the answer was not bigger portions. It was more eating occasions: from 3.8 a day in the late 1970s to 4.9 by the mid-2000s. Eating occasions were the single largest contributor to the rise.
The snacking numbers tell the same story from the other side. On any given day, 90% of adults now snack, up from 59% a generation ago. The average is 2.2 snacks a day, and they supply about a quarter of all daily calories. A quarter of what you eat is arriving through the door you are not watching.
Look again at the red day and notice what it does not contain: a single flat stretch. Every valley is a craving arriving exactly on schedule, and the next thing eaten is chosen by the crash, not by you. That is why the 3pm decision feels different from the 11am one. By 3pm you are not choosing. You are answering.
The green day has no such valleys, so the question never gets asked. The mountain creates the cravings, not the climber.
In the NIH's ward study, a randomised inpatient trial in which twenty adults ate each way for two weeks, the same people ate about 508 more calories a day on ultra-processed food than on matched whole food, without trying to overeat either week, and without reporting that the meals were any more enjoyable. The food runs the loop. Change the food and the cravings quiet down on their own.
If it feels like more than a habit, that is because for many people it is
In a nationally representative study of more than 2,000 US adults aged 50 to 80, published in Addiction in 2025, 21% of women and 10% of men aged 50 to 64 met the clinical criteria for ultra-processed food addiction on a validated screening scale. Among those aged 65 to 80 it was 12% of women and 4% of men.
The researchers noted that these rates outpace problematic alcohol and tobacco use in the same age group. And in Canada, ultra-processed food supplies roughly 46% of all daily calories.
If you have ever wondered why you can hold the line on almost everything else in your life but not on the cupboard at 9pm, this is the more likely explanation, and it is a far kinder one than the story you have probably been telling yourself.
breakfast, noun: the meal that breaks the fast
Notice what the word does not say. It does not say 7am. It does not say cereal. It says only that a fast has been running, and that this meal is what ends it. The French déjeuner and the Spanish desayuno both mean the same thing: to un-fast. Every language built the timer into the word, and then we quietly forgot it was there.
So the honest question is not what time is breakfast. It is: is your fast actually over?
On the red day it never begins. Food arrives roughly every ninety minutes for fifteen hours, so the body never once switches from storing to burning. On the green day, the first meal lands at 11am, not because anything was skipped, but because nothing crashed at 7am and demanded to be fed. Hunger showed up on its own schedule and was answered.
This is more common than people expect. Most adults eat across a window of 15 hours or longer. In one study of 19 adults with metabolic syndrome, 84% of whom were already on a statin or a blood-pressure medication, narrowing eating to a self-chosen 10-hour window for 12 weeks, with no instruction to change the food itself, reduced waist circumference by 3%, systolic blood pressure by 4%, and LDL cholesterol by 11%. Sleep improved too.
Worth knowing, in the same study blood sugar and insulin did not shift significantly. Timing helps. It does not replace changing what is on the plate, which is why this page spends most of its time on the food.
None of which makes an early breakfast wrong. Plenty of people are genuinely hungry at 7am and do well eating then. The point is narrower and more freeing: the clock is not the boss. Your fast is. If you are not hungry in the morning on real food, that is not a rule being broken. That is the system working.
How the body fights back
swipe the chart to see the whole day →
Insulin rides to the rescue: it rises after sugar and stays up until the job is done. Insulin is drawn on a relative scale for illustration.
The alarm. As blood sugar climbs toward the ceiling, the pancreas releases insulin.
The rescue. Insulin's job is to move sugar out of the blood and into your cells. The pine line surges to pull the red line back down.
The cost. The bigger the sugar spike, the bigger the insulin surge it takes to control it. Repeat that several times a day, for years, and the system starts to wear out. Cells stop answering the key. That is insulin resistance, and it climbs in silence, usually with no symptoms at all, until it has a name.
The cycle that runs your appetite
What years of high insulin are linked to
Insulin resistance builds quietly for years before anything shows up at a physical. Peer-reviewed research connects chronically high insulin and insulin resistance to a long list of conditions. The first six are established clinical consequences; the last three are areas of strong and growing evidence.
The good news is on the same page as the bad: for many people this is improvable ground, and the walk back down starts with the food. Bloodwork questions belong with your doctor. The daily habits are where coaching comes in.
How to flatten the terrain
None of this asks for willpower. It changes what the mountain looks like, and gentle terrain is climbable every single day. This is exactly the work of the Base Camp program.
Where are you on the mountain?
Take the free two-minute readiness quiz to find your starting point, or book a no-pressure call and we will map your route together.