The Bottom Line: If you’re exercising consistently, watching what you eat, and still not losing weight, the model you’re following is wrong – not your effort. The mainstream advice to eat less fat and exercise more fails most men over 40 because it ignores the actual driver of fat storage: insulin. Change what you eat, and the weight moves. The exercise follows.
You’re training consistently. You’ve cut the bread, reduced the beer most nights, watched your portions. Maybe you’re tracking on an app. Maybe you’ve seen a nutritionist. The scale has moved – barely – or it’s moved and come back.
This is not a discipline problem. This is a broken model.
I know, because I was running 70km a week and following a structured low-fat diet from a nutritionist in 2014. I was eating six times a day as instructed. I was constantly hungry. I ate the wholegrains. I limited fat. I counted calories. I exercised almost every day.
And I got fatter.
Not a little fatter. Around 10 kilograms heavier than I should have been. Like many men over 40, I assumed I needed more discipline. Eat less. Train harder. Try another diet.
What I didn’t realise was that the advice itself was the problem.
The conventional wisdom around weight loss had failed me.
Prof. Tim Noakes put it plainly: “If you have to exercise to regulate your weight, your diet is wrong.”
That sentence changed everything about how I understood what I’d been doing wrong.
Fourteen years later, at age 60, I am leaner, lighter, and fitter than I was in my 40s.
Why are you not losing weight even though you’re doing everything right?
The answer isn’t willpower. It isn’t metabolism. It isn’t age.
It’s insulin.
When you eat processed carbohydrates – bread, pasta, rice, cereal, most packaged food marketed as healthy – your blood sugar rises. Insulin rises in response to clear it. When insulin is elevated, fat burning stops. Your body is in storage mode, not burning mode.
If you’re eating six times a day as most conventional nutrition advice recommends, your insulin is elevated for most of the day. No amount of exercise overcomes that signal.
I was insulin-resistant. My body was storing the excess sugar from the carbs I was eating as fat, and I couldn’t lose that fat because I never gave my insulin levels a chance to drop. The low-fat, high-carb diet I was following was actively working against me – not through lack of discipline on my part, but through basic metabolic biology.
Dr. Jason Fung made the commercial interest in this explicit: “Nobody makes money when you skip meals.” The six-small-meals model wasn’t designed around your physiology. It was designed around food sales.
What is driving fat storage in men over 40 who eat well and exercise consistently?
In late 2014, I went to hear Dr. Stephen Phinney speak on nutrition. Phinney is one of the world’s leading researchers on low-carbohydrate performance and metabolic health. What I heard him present that evening forced me to rebuild everything I believed I knew about eating well.
The evidence wasn’t new. It was decades old. But it had been systematically sidelined by food industry funding, by sports science orthodoxy, and by an infrastructure of fitness and dietetic training that had locked in the low-fat model before most of us were adults.
As a personal trainer and endurance coach at the time, I was delivering that same advice to the 400+ people I trained monthly. The nutrition courses I had completed were built around the same premise: eat less fat, eat more often, fuel your activity with carbohydrates. It was consistent. It was almost universally wrong for the people I was watching struggle with their weight.
The fitness industry didn’t benefit financially from telling people to skip meals and eat real food. So it didn’t.
Why does mainstream low-fat nutrition advice fail men over 40?
A few days before Christmas 2014, I stopped eating processed carbohydrates. Completely. No bread, no pasta, no rice, no fruit juice, no sugar. I replaced them with real food – protein, vegetables, healthy fats. I had my blood lipid panel done before I started so I’d have a baseline to compare against.
My GP told me not to do it. My cholesterol was already elevated, in his view. When I told him I was following the approach Tim Noakes had been researching and applying for years, he became dismissive. That reaction made me more committed to running the experiment properly.
Six months later: the stubborn midsection fat was gone. I was running 15km and not hungry for two to three hours afterward. My HDL – the protective cholesterol fraction – had almost doubled. My triglycerides had dropped significantly. I had gone from eating constantly to eating two meals a day without effort or hunger.
I was training 20 hours a week on two meals a day. Not because I was disciplined. Because my body had switched fuel sources. Fat adaptation means your body runs on stored fat between meals instead of constantly demanding more carbohydrates.
What happens when you stop eating processed carbohydrates?
My experience wasn’t unique. Over the past 14 years I’ve seen the same pattern repeated hundreds of times with men who were working hard but following the wrong model.
Martin is an engineer in his 50s. He spent three months doing the gym consistently, counting calories carefully. He lost 3kg. He came to me. Twelve weeks later he’d lost 12kg. His words: “I’ve probably added at least a decade to my life.”
The difference wasn’t effort – he was putting in effort before he found me. The difference was the mechanism. He stopped fighting his insulin with more exercise and less food. He changed what his insulin was doing in the first place.
Craig is a retired army officer. He came to me at 105kg. Four months later he was at 90kg. His blood markers improved across every measure. His assessment:
“It was almost embarrassingly easy.”
Easy – because the approach works with your biology instead of against it. Not because it requires no change. It requires a significant change. But that change produces results that fighting insulin with cardio and calorie restriction cannot.
My own numbers after 14 years on this approach: 65kg, 15% body fat, resting heart rate of 39, and a 9:47 2.4km run at age 60. Not because I’m exceptional. Because the model works if you apply it correctly and stay consistent.
What results do men over 40 get when they fix the hormonal environment instead of increasing effort?
Nutrition drives weight loss. Exercise supports health. But exercise cannot compensate for a diet that keeps your insulin elevated.
The mainstream model has those reversed. It tells you to exercise more to burn the calories. It tells you to eat frequently to keep your metabolism active. It tells you fat is the enemy.
Every one of those positions has been undermined by decades of evidence. The men who are leaner, healthier, and more functional at 60 than they were at 45 – the ones in my results file – didn’t get there by running more or eating less fat. They got there by understanding what insulin does, changing what they eat accordingly, and letting the weight follow.
That’s the model. It’s not complicated. But it does require abandoning what you’ve been told.
Why does nutrition drive weight loss when exercise cannot?
If you’ve been doing the work and not seeing the results, the conversation I have with new clients isn’t about motivation or meal plans. It’s about understanding exactly what’s driving the problem and building a system around fixing it.
That conversation is 30 minutes and costs nothing. If it’s the right fit, we go further. If it isn’t, you leave with more clarity than you arrived with.
Find out exactly what's keeping you stuck.
Frequently Asked Questions
Why am I not losing weight even though I’m exercising every day?
Exercise doesn’t override the hormonal signal driving fat storage. If insulin is elevated – which it is whenever you’re eating frequently and consuming significant carbohydrates – your body is in storage mode, not burning mode. You can run 70km a week and not shift a kilogram. The starting point is changing what you eat, not how much you exercise.
What is insulin resistance and how does it cause weight gain?
Insulin resistance means your cells have become less responsive to insulin’s signal to absorb blood sugar. Your pancreas compensates by producing more insulin. High insulin keeps your body in fat-storage mode. The excess carbohydrates you eat don’t get burned – they get stored. Until you reduce carbohydrate intake enough to lower insulin consistently, fat loss is limited regardless of training volume.
Does a low-fat diet work for weight loss in men over 40?
For most men over 40 who are carrying significant excess weight, no. Low-fat diets tend to be high in carbohydrates, which keeps insulin elevated. They also tend to increase hunger because fat is the most satiating macronutrient. The majority of men I’ve worked with over 14 years arrived having already failed on low-fat, calorie-counted approaches. The diet model most associated with weight loss in this demographic is low-carbohydrate, healthy-fat eating – which reduces insulin and allows stored fat to be burned.
Can you lose weight without counting calories?
Yes. Fat adaptation – the result of consistent low-carbohydrate eating – reduces hunger naturally because your body learns to access stored fat between meals. Most of my clients move to eating twice a day without effort within the first few weeks, not because I’ve told them to restrict, but because they’re no longer hungry. Calorie counting as a primary strategy treats fat storage as a simple maths problem. It isn’t. It’s a hormonal problem.
How long does it take to lose weight on a low-carb diet?
Most men I work with see measurable change within two to four weeks. A typical result across a 12-week program is 10-15kg of actual fat loss – not water weight, not starvation weight, but metabolic fat reduction. The men in my results file range from 9kg in 12 weeks to 30kg in three months, depending on starting point, compliance, and the specific program structure.
Is the low-carb approach safe if I have high cholesterol?
This is worth discussing with your GP, and worth understanding in more detail before you start. What the research shows – and what my own six-month blood lipid test demonstrated – is that low-carbohydrate eating typically raises HDL (the protective fraction) and reduces triglycerides. These are the markers most predictive of cardiovascular risk. LDL often changes in pattern rather than absolute number, with a shift toward the larger, less atherogenic particles. I’d recommend reading Tim Noakes and Stephen Phinney’s published work on this before accepting a blanket “don’t do it” from a GP who hasn’t reviewed the evidence.
