The Bottom Line: Carbohydrates – not fat, not calories, not lack of exercise – are the primary driver of weight gain in men over 40. High-carb foods chronically elevate insulin, which locks fat in your cells and prevents your body from burning it. You can train every day and count every calorie and still not lose a kilogram, because the hormonal environment created by carbohydrates makes fat loss physiologically difficult. Fix the food first. Everything else follows.
You’ve been doing the work. Three to five sessions a week. Cut the bread, skipped most of the beers, maybe started tracking your food. The scales moved a kilogram or two in the first month, then stopped. Your energy’s inconsistent. You’re still carrying the same weight around your middle that you’ve had for the last five years.
That’s not a discipline problem. That’s not age. That’s not your metabolism slowing down.
That’s your hormones – and specifically insulin – doing exactly what they’re designed to do when you feed your body the wrong fuel.
I’ve been coaching men over 40 for 14 years. More than 850 men, one on one. The ones who couldn’t lose weight despite exercising, despite cutting calories, despite doing everything their GP or their trainer told them to do – they had one thing in common. They were still eating a high-carbohydrate diet. And in most cases, they thought they were eating well.
This post explains why. It’s not short. But if you’ve been stuck for months or years, you deserve the full explanation – not a listicle.
Why does eating less and exercising more stop working for men over 40?
Here’s what nobody explains to you properly.
Your body doesn’t store fat because you ate too much. It stores fat because of insulin. Insulin is the hormone that tells your cells what to do with the food you just ate. When insulin is elevated, your body is in storage mode. Fat burning is shut off. Existing fat stays locked in your cells. Dietary fat gets stored, not burned.
And what raises insulin? Carbohydrates. Every time you eat bread, rice, pasta, oats, cereals, fruit juice, or processed food of any kind, your blood sugar rises. Insulin floods your system to deal with it. The higher the carbohydrate load, the bigger the insulin spike.
This is not a fringe theory. It is basic endocrinology.
Dr. Jason Fung, one of the world’s leading authorities on insulin and obesity, puts it plainly: when insulin is chronically elevated from high-carb eating, your body cannot access stored fat for energy. You are literally locked out of your own fuel supply. You can run 10km and still not burn meaningful amounts of body fat if your insulin is elevated.
Now here’s where this gets important.
The calorie model tells you that weight loss is simple arithmetic – eat less, move more, create a deficit. That model ignores the hormonal environment entirely. It assumes all calories behave the same way in the body. They don’t.
Dr. David Ludwig, endocrinologist and Professor of Nutrition at Harvard, has spent years demonstrating this. His research shows that low-carb diets increase metabolic rate by 200-300 calories per day compared to low-fat diets, even when total calories are matched. Not because of some trick or supplement. Because different macronutrients produce fundamentally different hormonal responses. Reduce carbohydrates, insulin drops, and your body’s access to stored fat opens up.
The hormones matter more than the calories.
What is the appestat and why do carbohydrates break it?
Your body has a built-in appetite regulation system. It is called the appestat, and when it functions properly, it tells you when to eat and when to stop. It is the reason that for most of human history, people did not overeat chronically. Not because of discipline or willpower. Because the biological signal to stop eating worked correctly.
Professor Tim Noakes, one of the most-cited exercise and sports science researchers in the world and an Ambassador for the Noakes Foundation, explains what has happened to that system:
“Weight gain cannot occur without the ingestion of more calories than are needed by the body. In this sense, the energy balance model of obesity is correct. But the point is that the over-ingestion of calories cannot occur if the brain appestat is functioning properly, as it did in 1980. The appestat of the obese must fail because it is especially susceptible to the appetite-stimulating effects of high-carbohydrate foods, especially those found in modern processed foods.”
That is a precise and important point. Yes, you overeat calories when you gain weight. But the reason you overeat is not weakness or lack of willpower. The reason you overeat is that high-carbohydrate, processed foods are specifically engineered to override your body’s off switch.
Modern wheat is not the wheat your grandparents ate. It has been selectively bred for yield, texture, and palatability. Research shows that peptides produced during gluten digestion, known as exorphins, can activate opioid receptors in the brain. They increase appetite and reinforce the behaviour of eating more. Bread, pasta, oats, cereals. These are not neutral foods. They are products designed to keep you eating.
This is why telling an overweight man to “just eat less” is useless. His appestat is already compromised. The foods he is eating are working against him at the neurological level. Willpower is not a match for a hormonal system that has been hijacked.
Why does fat not make you fat – and what does low-fat eating actually do to your body?
The low-fat dietary guidelines introduced in the 1980s are one of the most consequential mistakes in the history of public health. We have spent forty years removing fat from food, replacing it with carbohydrates, and watching rates of obesity, type 2 diabetes, and metabolic illness climb every decade.
Here is what removing fat from your diet actually does:
Fat triggers satiety. When you eat fat, it signals to your body that you have had enough food. Remove fat, and that signal weakens. You stay hungry. You eat more. And because the fat has been replaced with carbohydrates in virtually every low-fat product on the market, the insulin response goes up while satiety goes down. It is the worst possible trade.
Fat has virtually no effect on insulin. Protein has a moderate effect. Carbohydrates drive the sharpest and most sustained insulin response. A diet built around fat and protein keeps insulin low and stable. A diet built around carbohydrates keeps insulin chronically elevated. One of these allows your body to access its stored fat. The other locks it away.
Dr. Ludwig’s research is clear on this: the high-carb, low-fat eating pattern causes you to become hungrier and burn fewer calories simultaneously.
I spent years as a triathlete eating the way I was told to eat. High carbohydrates for fuel, low fat, lots of training volume. I was running 70 kilometres a week. I was still fat. I was still carrying weight I should not have been carrying. I was paying a dietitian $200 an hour for advice that was keeping me overweight.
It was not until I attended a seminar by Professor Stephen Phinney on low-carb nutrition for athletes that I understood what had actually been happening. I went home, told my wife I was done with bread, rice, and pasta, and within six months I was at 65 kilograms. I have been there for 14 years.
That is not a testimonial. That is a proof of concept. And I have repeated it with 850 men since.
What happens to your body when you eat carbohydrates throughout the day?
Most men eating the standard Australian or Western diet are on a blood sugar roller coaster from morning until night. It works like this:
You eat breakfast – cereal, toast, muesli, a piece of fruit, maybe a yoghurt. Your blood sugar spikes. Insulin floods your system to manage it. Your blood sugar crashes an hour or two later. You feel tired and hungry again. You reach for a snack – a muesli bar, a banana, some crackers. The cycle repeats. By mid-afternoon you are fighting an energy slump. By evening you are ravenous and craving exactly the foods that started the problem.
This is not weakness. This is physiology working exactly as it is designed to work when you eat a high-carbohydrate diet.
Now compare that to what happens when you remove the carbohydrates.
Blood sugar stabilises. Insulin stays low. Your body shifts from burning glucose, which requires constant replenishment, to burning fat, which your body has unlimited access to. Hunger between meals drops dramatically. Energy becomes consistent through the day without caffeine or snacks.
I track my clients’ food daily. When they are eating the right way, I can look at their data and tell within about 48 hours whether they have eaten high-carb foods or had alcohol. The glucose pattern tells me everything. When they are in the right hormonal state, hunger is not the driver it was. They start skipping meals not because they are restricting, but because they are not hungry. That is what fat adaptation looks like.
How do carbs and weight loss connect for men who exercise regularly but can’t shift weight?
This is the most common pattern I see.
The man has been exercising consistently – gym, running, cycling, sports – and cannot shift the weight. He attributes it to age, or a slow metabolism, or the wrong genetics. His GP has told him to eat less and move more, which he is already doing.
Here is what is actually happening.
Exercise burns glucose, not fat, at the intensity most men train at. High-intensity exercise – gym circuits, spin classes, running at pace – relies almost entirely on glycogen (stored glucose) for fuel. When that glycogen is depleted, hunger spikes and you replace it. You may be burning 400 calories in a session and replacing 600 without realising, because the hunger signal from high-intensity exercise is strong.
At the same time, intense exercise elevates cortisol, the stress hormone. Chronically elevated cortisol suppresses fat burning and drives carbohydrate cravings. The men who are training hardest and eating the cleanest, in conventional terms, are often running the highest cortisol alongside the highest insulin. Their hormonal environment is working against fat loss from two directions.
Dr. Mark, a 62-year-old GP and competitive A-grade cyclist who worked with me, ran maximum-intensity Zwift sessions that nearly put him on the floor. He lost not a gram of weight. He switched to the nutrition approach I use with all my clients, backed it with appropriate lower-intensity training, and lost 11kg in 12 weeks. He was back to the racing weight he had not seen in 40 years.
His words: “Weight loss is 95% diet. All the exercise in the world is not going to fix a bad diet.”
He is a doctor. He spent decades telling patients to eat less fat and exercise more. He no longer does.
Which carbohydrates are most damaging for weight loss in men over 40?
Not all carbohydrates behave identically. But the ones most men consider healthy are often the most problematic.
Grains and grain-based foods. Bread, pasta, rice, oats, cereals, crackers. These are the staples of the conventional healthy diet. They are also the fastest route to chronically elevated insulin. Wholegrain versions slow the glucose spike slightly. They do not change the underlying hormonal response in a meaningful way for a man who already has metabolic dysfunction.
Processed foods marketed as healthy. Muesli bars, protein bars, flavoured yoghurts, low-fat snacks, fruit juices, sports drinks, smoothies. These are carbohydrate delivery systems in health packaging. The fact that a label says “low fat” or “wholegrain” tells you nothing useful about how that food affects your insulin.
Liquid carbohydrates. Fruit juice, soft drinks, alcohol (specifically beer, sweet wines, and mixed drinks). Liquid calories skip the digestion process that slows glucose absorption in solid food. A glass of juice produces a faster, sharper insulin spike than the same sugar consumed in whole fruit. Alcohol is a separate problem – your liver prioritises processing alcohol above everything else, which means fat burning stops entirely while alcohol is in your system.
Fruit in high quantities. Fruit is not the problem for a metabolically healthy person. For a man who is overweight, insulin resistant, and trying to lose fat, high-fructose fruit consumed throughout the day is counterproductive.
The foods that do not raise insulin: meat, fish, eggs, poultry, green vegetables, nuts, seeds, olive oil, avocado. These are the foods a fat-adapted man builds his diet around.
Calculate your ideal carb intake here.
What does the research on low-carb diets for weight loss actually show?
The research is not ambiguous. It has become less ambiguous with each passing decade, despite what mainstream dietary guidelines have been slow to acknowledge.
Multiple randomised controlled trials now show that low-carbohydrate diets produce greater fat loss than low-fat diets matched for calories. They produce better outcomes on blood sugar, triglycerides, HDL cholesterol, and blood pressure. They reduce hunger more effectively, which means adherence is substantially better over time.
Dr. Ludwig’s work at Harvard is perhaps the most directly relevant. His controlled feeding trials isolated the hormonal variable from the calorie variable and demonstrated that the same number of calories produced a 200-300 calorie per day difference in metabolic rate depending on the macronutrient composition. Men eating low-carb burned significantly more calories at rest than men eating low-fat, despite identical caloric intake.
The practical implication: even if you made no effort to eat less, shifting to a low-carbohydrate diet would likely produce fat loss, because the hormonal environment it creates allows your body to access stored fat and increases your metabolic rate simultaneously.
This is not theoretical. I see it every week.
What results do men actually get when they remove carbohydrates?
Here are a few from men I have worked with directly.
Craig, a retired army officer, came to me at 105kg. In four months he was at 90kg. Blood markers – cholesterol, triglycerides, blood pressure – improved across all measures. He described the process as “almost embarrassingly easy.” He was not eating less in terms of volume. He was eating differently.
Martin, an engineer in his 50s, had spent three months doing gym sessions plus calorie counting before we started. In those three months he lost 3kg. In 12 weeks with me, he lost 12kg. The difference was not more discipline. The difference was that he stopped eating the foods that were working against him. His words: “I’ve probably added at least a decade to my life.”
A former competitive triathlete came in with a back injury that had stopped him training. Previous approach: calorie counting plus three-hour rides and one-hour runs to compensate. Weight would not shift past a certain point. He lost 7kg in 8 weeks without significant exercise. His observation: “Even without the exercise, the weight just came off. I was just dropping a kilo a week once my body got used to the lower carb intake.”
The pattern is consistent. Remove the carbohydrates, lower the insulin, and the body does what it is designed to do.
You can see more results at andreobradovic.com/results.
What should men over 40 eat instead of carbohydrates to lose weight?
The shift is simpler than most men expect. It is not about complicated meal plans or exotic foods. It is about returning to the foods that do not disrupt your hormonal system.
Protein at every meal. Meat, fish, eggs, poultry. These are the foundation. Protein is highly satiating, has a moderate insulin response, and supports muscle retention during weight loss. Aim for sufficient protein at two to three meals. Do not be afraid of fat – the fat in meat, fish, and eggs is not the enemy.
Green vegetables. As much as you want. Leafy greens, broccoli, cauliflower, zucchini, capsicum, spinach, asparagus. High volume, low carbohydrate, high fibre.
Good fats. Olive oil, avocado, nuts in moderate quantities. These slow digestion, increase satiety, and do not raise insulin.
Eliminate the obvious carbohydrate sources first. Bread, pasta, rice, cereals, oats, sugar, soft drinks, juice. Do this before optimising anything else. Start there and stay there for 30 days. See what happens.
Reduce meal frequency. When your blood sugar is stable and insulin is low, you will not be hungry between meals. Many men find they naturally move to two meals a day without forcing it. That is a sign that fat adaptation is working, not a sign that you are restricting.
Eliminate alcohol or reduce it sharply. Even if you do everything else right, alcohol will hold you back. It does not matter how clean your diet is the other six days. If you are drinking on weekends, you are blocking fat burning for a significant portion of the week. This is not moralising. It is mechanism.
My free macro calculator can help you set starting targets.
What is the single most important principle for losing weight as a man over 40?
Nutrition drives weight loss. Everything else supports it.
If you take one thing from this post, it is that. Not exercise. Not tracking steps. Not calorie counting. The food environment you create – what you put in your body, how often, and what hormonal response it produces – is the primary lever. Exercise and sleep and stress management are real and they matter. But they are multipliers on a foundation that has to start with food.
The reason you are not losing weight is almost certainly not a failure of effort. It is a failure of information. The model you have been given – eat less fat, move more, count your calories – is the wrong model. It does not account for the hormonal environment that drives fat storage and fat release. Changing that model is not complicated. But it requires letting go of what you have been told, because most of what you have been told is wrong.
If what I have described here matches your situation – and if you have been at this for months or years without the results you expected – the next step is a conversation.
It costs nothing. It takes 30 minutes. I will tell you honestly whether what I do is a fit for where you are.
Find out exactly what's keeping you stuck.
Frequently Asked Questions
Why am I not losing weight even though I’m eating healthy and exercising?
The most common reason is that your diet, even if it contains “healthy” foods, is too high in carbohydrates. High-carb eating keeps insulin elevated, and elevated insulin prevents your body from accessing stored fat. Exercise burns mainly glucose at the intensities most men train at, and it does not override the hormonal effect of a high-carb diet. The fix is nutritional, not more training.
Do carbs cause weight gain in men over 40?
Yes, but the mechanism is hormonal, not caloric. Carbohydrates raise insulin. Insulin is the primary hormone controlling fat storage. When insulin is chronically elevated, your body cannot burn stored fat effectively. Men over 40 often have some degree of insulin resistance, which means the same carbohydrate load produces a higher and more prolonged insulin response than it did at 25.
Does calorie counting work for men over 40?
Calorie counting is a poor primary strategy for men over 40 because it does not address the hormonal environment that controls fat storage. Two men can eat the same number of calories and produce completely different fat storage outcomes depending on the macronutrient composition of those calories. Research has shown that low-carb diets increase metabolic rate by 200-300 calories per day compared to low-fat diets, even when total calories are identical. Fix the hormonal environment first.
Can I lose weight without counting calories on a low-carb diet?
Yes. When carbohydrates are low, blood sugar stabilises, insulin drops, and hunger between meals decreases significantly. Most men naturally eat less because they are no longer on the blood sugar roller coaster that drives constant hunger and cravings. The appetite regulation system starts functioning correctly again, and it does the counting for you.
Why does eating bread make it so hard to lose weight?
Bread raises blood sugar and insulin rapidly, even wholegrain versions. Research shows that certain proteins in wheat, when digested, produce compounds that activate opioid receptors in the brain, increasing appetite and reinforcing the pattern of eating more. Removing bread is usually one of the highest-impact single changes a man can make.
How long does it take to see results on a low-carb diet?
Most men notice reduced hunger and more stable energy within the first week. Meaningful fat loss typically begins in weeks two to four, once the body has cleared stored glycogen and begun shifting toward fat as its primary fuel. The men I work with generally lose 6-12kg in the first 12 weeks – without exercise as the primary driver and without hunger being a constant feature.
