Nourish, Don't Punish and Why Eating Less Stopped Working
Darren Tebbenham is a metabolic and mental health expert known for the idea that metabolic health is mental health. A former university lecturer in exercise psychology, he co-founded Gloo Fitness, authored two books, has trained more than 3,000 health professionals from 30+ countries & now speaks to organisations on energy, wellbeing & performance.
There’s a reflex almost everyone has when they decide to lose weight. Eat less. Cut something out. Go without. It feels like the right instinct because it feels like penance, as though the weight is a debt and hunger is how you repay it. For a fortnight, it appears to work.
Then it stops. What almost nobody is told is that it stopped for a reason, and the reason isn’t you.
What your body does next
When you eat less and move more, you create a gap between what you’re taking in and what you’re using. That much is simple arithmetic.
The interesting question, the one that decides everything, is, "What does your body do about that gap?"
It has two options:
It can open the cupboard and burn the fat it has been storing for exactly this situation.
Or it can quietly reduce what it spends, so the gap closes without touching the fat at all.
One of those looks like progress. The other looks like being cold, tired, irritable, and hungry while the scales sit exactly where they were four months ago.
Most people who come to me for help are getting the second one. Not because they’re doing it wrong. Because their body has decided that fat is not available.
Availability is the whole game
Fat isn’t locked away by willpower. It’s locked away by hormones, chiefly insulin.
While insulin is high, fat release is switched off. That’s not a metaphor; it’s the mechanism. Insulin’s job is to store, and it cannot store and release at the same time.
So, if your insulin is running high, which it will be if you’ve spent thirty years eating a diet high in refined carbohydrates, you can create as large a deficit as you like, and your body will still not touch your fat. It will take the energy from somewhere easier instead. Your thyroid output. Your body temperature. Your inclination to move. Your muscle.
You end up smaller, weaker, colder, and hungrier, and everyone congratulates you.
Then you eat normally again, and it comes back with interest because the machinery that burns it is now smaller than when you started.
Which is why the answer isn’t less
Here’s the sentence I’d like people to take away because it inverts almost everything the industry has told them, “Give your body what it needs, and it will give you what you want.”
Enough protein, so it stops taking the difference from your muscle. Enough real food, so it isn’t hunting for something at four in the afternoon. Fewer refined carbohydrates, so insulin comes down and the cupboard opens. Enough sleep because a tired body is an insulin-resistant one.
That is nourishment, not restriction. It is a genuinely uncomfortable idea for someone who has spent decades believing that the answer to a body they dislike is to give it less.
But watch what happens when the fat becomes available. Energy comes back first, usually within a fortnight and long before the scales do anything interesting. Then focus. Then mood. Then, eventually, the weight, steadily and from fat rather than muscle.
Then the harder half
If explaining this were enough, I’d have been out of a job twenty years ago.
Because here is what I’ve watched happen thousands of times: someone understands all of the above completely, agrees with every word, goes home, and by the third Tuesday, it has quietly stopped.
Not because they stopped believing it. Because it met a bad night’s sleep, a birthday cake in the office, a fortnight of stress, and somebody else’s crisis.
This is the part the industry skips, and it’s the part that actually decides outcomes. Nobody fails on the plan. They fail when the plan collides with real life.
So the questions that matter are rarely nutritional ones. They’re:
What happens on your weekends? For most people, the whole week is undone in forty-eight hours, and no amount of Monday-to-Friday discipline outruns it.
What do you do when you’re stressed? If eating is how you take the edge off a difficult day, then a meal plan is an answer to a question you weren’t asking.
What happens after you slip? This is the big one. When the plan requires perfection, the first ordinary human moment doesn’t dent it; it ends it because you’ve relabelled yourself as “off it,” and the rest of the week goes with it.
What have you built for the weeks that go badly? Not the weeks that go well. Anyone can do the good weeks.
Simple isn’t the same as easy
None of this is complicated. Nourish rather than deprive. Bring insulin down so your fat becomes available. Build muscle because it’s where the burning happens. Then deal honestly with the specific things that break your consistency rather than pretending willpower will cover them.
It’s simple. It’s just not easy, and anyone selling you easy is selling you the fortnight, not the decade.
But it is learnable. The strange gift buried in all of this is that once the habits are running the show rather than your willpower, the whole thing becomes something close to effortless.
Easy is earned.
Next, two books on the biology and psychology of weight loss are free here. Darren provides virtual as well as in-person wellbeing events, as well as the Ultimate 10 Week Challenge.
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Darren Tebbenham, Metabolic & Mental Health Expert
Darren Tebbenham is a leader in metabolic and mental health, behaviour change, and human performance. A former university lecturer in sport and exercise psychology, he grew frustrated that knowing what to do rarely helped people actually do it, so he left the lecture hall to build methods that change behaviour from the inside out. He has since dedicated his career to helping people and organisations transform their health, energy and performance, having trained over 3,000 professionals across 30+ countries and co-founded Gloo Fitness. His mission is simple: metabolic health is mental health. Body and mind are inextricably linked, and both perform at their best only when we treat them as one.
