Calories In, Calories Out, and Bad Math.

​"Calories in, calories out." That has been the acceptable standard for many years. It is still the standard in certain circles, because it still is true. At the end of the day, it is how many calories we take into our body and how many of those calories our body burns off. The net sum determines which way our weight is going to go.

This is a real law of thermodynamics. Energy in, energy out. It applies to a healthy body that has no problem taking calories in, converting them to glucose, and burning that glucose through the normal activities of daily life. The people who use personal experience as their rationale to still espouse this idea likely have bodies that have no problem with that metabolic process. It works as it should. They take in roughly the same number of calories they burn every day, their weight stays roughly stable, and the math makes sense to them because they can see it working.

The problem is that for a lot of people, the math does not add up. The calories burned, after all the activity, do not match the calories taken in, and so there is a net increase in stored calories as weight. These are not those people who are eating dramatically more than they burn. The math, for them, just stops working the way it should.
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Somewhere between the calories in and the calories out, something is not working right. That is where weight gain begins for a large number of people, and that is the purpose of this post. What happens, or does not happen, in the body that breaks normal metabolism?
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​The delivery system, when it works

When we eat, our body breaks food down into glucose, which is the fuel our cells run on. Glucose enters the bloodstream and needs to be delivered to the cells throughout our body. Insulin is the hormone that makes that delivery happen. It acts like a key, opening the door of each cell so glucose can get in and be burned for energy.

When this process is working normally, we eat, causing glucose to rise. Then insulin is released by the pancreas, causing the cells to take up the glucose and burn it as energy. Then, because glucose has been metabolized, insulin drops back down, and our body shifts into fat-burning mode between meals. Our weight stays roughly stable because our physiology is doing its job properly.

Insulin is also the signal that tells the body to store fat. When insulin is high, the body is in storage mode. When insulin is low, stored fat can be released and burned. This switching back and forth throughout the day is how a healthy metabolism works.

When the delivery system breaks down
Over time, from years of certain eating patterns, chronic stress, poor sleep, or some combination, the cells can start ignoring the insulin signal. They stop opening the door. This is insulin resistance, and it is at the center of most metabolic weight problems.

The pancreas responds by sending more insulin to try to force the delivery through. And it works, mostly. Blood sugar may still look normal on a standard lab panel. But the cost of keeping it there is that insulin is elevated for longer periods throughout the day.

When insulin stays elevated for most of the day, the body keeps receiving the signal to store fat and hold it. That happens regardless of how much we are eating. The calorie total is not the problem at that point. The hormonal signal is wrong, and until that changes, the body responds to it accordingly.

We can still lose weight by cutting calories significantly in this situation, but it takes far more effort than it should and the hunger is harder to consistently manage than we can often handle. Most of us who have been through this know the pattern: the weight comes off slowly, then comes back quickly once normal eating resumes, because none of what was originally causing the problem has changed.

Insulin resistance affects every cell in the body, including the brain. When the brain becomes insulin resistant, the signal that tells it energy is available gets blunted. The brain perceives a kind of energy shortage even when plenty of fuel is stored in the body as fat. The result is that we feel hungry even when we have eaten enough, because the signal telling the brain to stop eating is not getting through clearly.

Stress and the fat storage signal
Our body has a built-in emergency response for dealing with threats. When the brain perceives danger, it triggers the adrenal glands to release adrenaline and then cortisol. These hormones pull sugar out of storage and push it into the bloodstream so the muscles have instant fuel to respond.

In an actual physical emergency, that response makes sense. The trouble is the body cannot tell the difference between a physical threat and a stressful phone call. It runs the same response either way. Blood sugar rises, ready to fuel a physical response that never comes. Insulin moves in to manage the extra glucose. The body stores what was not burned as fat. A few hours later another stressor triggers the same chain.

Do that day after day for months or years and cortisol stays chronically elevated, insulin stays chronically elevated, and the body keeps getting the signal to store fat regardless of what is being eaten. Cortisol directs the body to store fat specifically around the abdomen, around the organs. That abdominal fat is more damaging to health than fat stored under the skin elsewhere, and it makes insulin resistance worse. People under sustained stress often accumulate belly fat even when their eating has not changed.

What makes this harder is that visceral fat is not passive. It produces its own hormonal signals, and those signals tell the brain and body to hold onto fat and resist burning it. Someone with significant abdominal fat is dealing with a fat deposit that is actively working against weight loss, which is why this visceral belly fat never seems to go away.

Sleep and metabolism
When we do not sleep enough, the body reads it as a form of stress and runs the same emergency hormone response described above. Cortisol rises. Blood sugar rises. Insulin follows to manage it. This is happening before we have eaten a single thing the next morning, which means we are already starting the day with elevated insulin and a body primed toward fat storage.

Sleep deprivation also scrambles two hormones that control hunger and fullness. Ghrelin, which signals hunger, goes up when we are sleep deprived. Leptin, which signals fullness, goes down. The practical result is that we wake up hungrier than we should be, craving the wrong types of food. We eat more than we intended and feel terrible when we are done. We blame this on bad choices and lack of willpower, and to some degree those may be involved. However, our best intentions are often compromised when we are not getting enough sleep.

Put those two things together and a person consistently sleeping six hours a night is starting every day insulin resistant, hungrier than normal, and less able to feel full. They could be eating carefully and exercising and still not getting the results their efforts should produce, because the sleep deficit is undermining the whole system. For that person, fixing sleep is the real work.

The food matters, not just the amount
Different foods produce very different insulin responses, even at similar calorie counts. Refined carbohydrates, white bread, white rice, white flour products, sweetened drinks, fruit juice, most packaged snack foods, break down into glucose quickly. Blood sugar spikes fast. The pancreas releases a large burst of insulin to manage it. For someone already insulin resistant, that burst has to be even larger, stays elevated longer, and leaves us hungry again within a couple of hours. If we have ever eaten a big bowl of pasta or a stack of pancakes and found ourselves looking for something to eat two hours later, that is the cycle.

Protein keeps us full longer, requires more energy to digest, and does not produce the same kind of insulin spike. Dietary fat barely raises insulin at all. Eggs, avocado, olive oil, fatty fish, these foods do not trigger the same storage response that refined carbohydrates do.

Fiber is the key to the carbohydrate question. When we eat a whole apple, the fiber slows down how quickly the sugar gets absorbed. Blood sugar rises gradually. The insulin response is modest. The same sugar without the fiber, apple juice for example, hits the bloodstream fast and produces a much larger insulin response. One of the main reasons ultra-processed foods are so damaging is that the fiber is stripped out in manufacturing, leaving the carbohydrate load without the buffer. The sugar hits fast, insulin spikes, and the cycle runs on repeat.

This does not mean carbohydrates are the problem for everyone. For people whose insulin system is not working well, the type of food matters significantly, not just the total amount. Two meals with similar calorie counts can send the body in very different directions depending on what they are made of.

The gut's role
The gut is considerably more than just a digestive tube. Our digestive tract is home to trillions of bacteria that influence not only how much energy we extract from food, but what hunger and fullness signals our brain receives, how our immune system behaves, and how well our cells respond to insulin. The state of that bacterial community, and the health of the gut lining, has a direct effect on our weight.

When the lining of the small intestine gets damaged, from poor diet, chronic stress, certain medications, or bacterial imbalances, it starts leaking at a microscopic level. Particles that should stay inside the gut get through into the bloodstream. The immune system, which guards this boundary in large numbers, responds to those particles as a threat and fires an alarm.

That alarm does not stay in the gut. It circulates through the body and makes cells throughout less responsive to insulin, adding to the resistance problem. The gut inflammation and the insulin resistance end up making each other worse.

The gut bacteria also produce hormones that communicate with the brain about hunger and fullness. A disrupted bacterial community sends different signals than a healthy one, and persistent hunger that does not match how much we have actually eaten is often the result.

The brain, food, and the pull toward the wrong things
​The calorie model treats eating as a rational decision, as if hunger is a simple signal and the amount eaten is a straightforward choice. For many people it is considerably more complicated than that.

Certain foods, particularly those combining sugar, fat, and salt in specific proportions, activate the brain's reward system in ways that have more in common with addictive substances than with a bowl of vegetables. This is the result of decades of food product engineering aimed at making things as compelling as possible to eat and as hard as possible to stop. The pull toward these foods is not a personal failing. It is a neurological response to something specifically designed to produce it.

A disrupted gut makes this worse by sending altered signals to the brain through the vagus nerve that connects them. Mood, motivation, and food preference are all influenced by what the gut is communicating. When the gut is not in good shape, those signals push toward the foods that provide the quickest reward and away from the ones that would actually help.
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All of this, the gut signals, the food engineering, the insulin resistance in the brain itself, works in the same direction. It makes eating less and choosing better harder than it should be, through mechanisms that have nothing to do with character or discipline.

When the math doesn't work
Calories in, calories out is true in theory, for a healthy, normal functioning body. The problem is that for a significant number of people, Thats not them. Between the calories coming in and the calories going out, there is a whole host of interferring mechanisms. A hormonal environment that is shaped by abnormal insulin function, stress hormones, sleep problems, gut issues, and a neurological reward system, that is almost impossible to resist. That environment determines how efficiently the body processes food, how much insulin it releases in response, how long that insulin stays elevated, how much of the incoming energy gets stored versus burned, and how hungry/obsessive the person feels throughout all of it.

Two people eating the same calories in the same deficit can have different results because they are operating in different hormonal environments. The difference is not just willpower, it is also messed-up physiology.

If the math has stopped working for you, read more about our weight management approach or read about the testing we use and why standard panels miss most of this.

Schedule a consultation or call 704-663-2010.

Serving Mooresville and the Lake Norman area, including Davidson, Cornelius, Huntersville, Troutman, and Statesville.