You Probably Do Eat Quite Well. That Might Not Be the Problem.

If you eat well and your weight still isn't moving, the most likely explanation isn't a broken metabolism, and it isn't simply your age. More often it's the food and drink that never make it into the picture you hold of your own diet. Your meals can be genuinely good while the total across a week tells a different story.

That isn't a criticism or accusation. It's one of the most consistent findings in nutrition research, and it happens to intelligent, well-organised people all the time.

"I eat quite well"

This is one of the things I hear most often in a consultation. And most of the time, I don't think the person is wrong.

Breakfast is sensible. Lunch is a decent salad or a sandwich with some protein in it. Dinner is home cooked, with vegetables. If you asked a dietitian to mark those three meals, they'd probably pass.

So why isn't anything changing?

Because your diet isn't breakfast, lunch and dinner. It's everything you eat and drink across seven days. When you ask yourself "how well do I eat?", your brain reaches for the meals as evidence. They're the planned, visible, repeatable part of your day. Everything else quietly gets filed under "exceptions".

The bits that don't make it into the story

Here's what tends to live in that exceptions file:

• The biscuits with the mid-morning coffee

• The handful of crisps while you're waiting for dinner

• The bits you pick at while cooking, and the kids' leftovers afterwards

• The glass of wine while you cook, and the one with the meal

• The Friday takeaway

• The cheese and crackers that appear once the bottle's open

• The Saturday pints

• The doritos and salsa in front of the television that "didn't really count"

Individually, each one genuinely is an exception. Collectively, they can easily be the explanation.

Alcohol is where I focus the mind and attention, because it's the one most people underestimate. The NHS puts a standard 175ml glass of 12% wine at up to 158 calories and a pint of 5% lager at up to 222. Three glasses on a Friday and three pints on a Saturday comes to over 1,100 calories before anyone has opened a bag of crisps. Here I'm not even talking about those goldfish bowl sized glasses, just the regular ones. And alcohol rarely goes unaccompanied. A 2019 meta-analysis of controlled studies found that drinking alcohol increased how much people then ate, on top of the calories in the drinks themselves.

None of that makes wine or beer "bad". It just means they're part of the arithmetic, whether or not they're part of the story.

Why intelligent people do this

This isn't about lying. Most people who underestimate what they eat aren't trying to con anyone least of all themselves. But, ultimately the person they're most successfully convincing is themselves.

We don't assess our own behaviour like independent scientists. We hold a self-image ("I eat healthily", "I don't eat much", "my diet isn't the problem") and, once that belief is in place, we're naturally better at noticing evidence that supports it. Psychologists call this motivated reasoning. The chicken salad at lunch is evidence. The vegetables at dinner are evidence. Friday evening is an exception.

The research backs this up in an uncomfortable amount of detail. When scientists compare what people report eating with what their bodies actually burn, measured using a technique called doubly labelled water, the majority of studies find significant under-reporting. And, it isn't random. People tend to report their meals reasonably well and their snacks much less well. Alcohol is notoriously under-reported. Foods with a "less healthy" image, like cakes, biscuits and sweets, are the ones most likely to go missing. That's exactly the pattern of the exceptions list I gave you earlier.

The most striking example is an older but often-cited study from the New England Journal of Medicine. Researchers looked at people who said they were "diet resistant": they reported eating very little and still weren't losing weight. When the team measured everything properly, these people's metabolisms were normal, within about 5% of what you'd predict. What was different was the reporting. On average they under-reported their food intake by 47% and over-reported their physical activity by 51%

That was with a specific group of people who were seeking obesity treatment, and it was 1992, so I wouldn't stretch the exact numbers to everyone. But the direction of the finding has been repeated many times since. Our mental summary of our behaviour can simply drift away from the behaviour itself, with no intention to deceive at all.

The comforting explanation

When the scale won't move, other explanations become very attractive.

"My metabolism has slowed down." "It's my age." "It's hormones." "I hardly eat anything." "It's menopause." "I have low testosterone."

I want to be fair here, because some of these can genuinely matter. Menopause changes body composition and can affect appetite and sleep. Thyroid problems are real. Some medications affect weight. Losing muscle as you age reduces how much energy you use. If you've got symptoms that worry you, or a sudden change you can't explain, that's a conversation for your GP, not a self-diagnosis after reading blog post.

But the most common version of the story, that metabolism steadily slows through your 40s and 50s, doesn't hold up at all well. A large 2021 study in Science, which measured the energy expenditure of more than 6,000 people across their lifespans, found that once you account for body size and muscle, daily energy expenditure stays remarkably stable from about 20 to 60, and only starts to decline gently after that. Midlife weight gain is far more often about what's changed in our lives (more desk, less movement, less muscle, more stress, more wine) than about a metabolism that's given up.

An explanation can be physiologically plausible and still not be the main explanation in your case. And it's worth asking why we're drawn to it. An explanation that doesn't require us to change anything is much more comfortable than one that does. That's just human nature.

Two clients, one drink, two different answers

Two clients of mine illustrate this well.

The first decided to stop drinking alcohol completely. The second didn't stop at all. They simply restricted drinking to weekends.

Both made a real difference to their results. What they had in common wasn't setting rules about drinking. It was that alcohol had been sitting outside the story they told themselves about their diet. Once it was visible, they could make a decision about it, and each of them chose the change they could actually live with.

That's the point. The goal isn't to find out which foods you're "allowed". It's to find out which of your actual behaviours are producing the result you're getting, and then make the smallest change that moves things.

Stop judging your diet. Observe it.

So swap the question. Instead of asking "do I eat healthily?", ask "what do I actually eat and drink over seven days?"

The practical answer is a simple food and drink log, kept honestly for one ordinary week. Not a diet. Not a new set of rules. Just observation. A few principles make it far more useful:

• Change nothing at first. You're collecting data, not trying to look good. A week of unusually virtuous eating tells you nothing.

• Record as you go, not at the end of the day from memory. Memory is exactly where the exceptions get lost.

• Include the weekend. For many people the weekday picture and the weekend picture are two completely different diets.

• Count the mundane stuff. The milk in your coffees. The biscuit someone offered you. The handful of nuts. The wine while cooking. The food eaten standing at the kitchen counter.

Not because any of those things are wrong. Because you can't make an informed decision about a behaviour you've mentally deleted from the evidence. Again, it's quite normal for us humans to distort and delete information, we all do it to some degree.

There's good support for this. Self-monitoring is one of the most established techniques in weight management, and systematic reviews consistently find that people who monitor more tend to lose more weight. It's worth being honest about the limits, though: much of that evidence is observational, so it shows an association rather than proving cause. Some of the benefit also comes from the simple fact that writing things down makes you notice them. And it doesn't mean you need to weigh every meal for the rest of your life. A review of nearly 60 weight-loss trials found that simplified forms of monitoring often worked too. With my PrimeFit clients they just snap a photo in the app and write what they ate.

I think of it this way: logging isn't primarily about counting calories. It's about replacing the story with data. One honest week is usually enough to show you where the gap is.

One caveat. If tracking food makes you anxious, or starts to feel obsessive, it isn't the right tool for you, and that's worth saying out loud to someone you trust rather than pushing through.

Your body responds to what you actually do

There's no moral judgement in any of this. You don't become a worse person because you enjoy wine, biscuits or a Friday takeaway.

But your body responds to what you actually eat and drink, not to the story you tell yourself about what you do.

If your goal is to lose weight and your current routine isn't getting you there, you've got two honest options. Change the goal, or change some of the behaviour. What doesn't work is changing the explanation while leaving everything else exactly as it is.

A second pair of eyes

This is one reason I spend time looking at someone's real week before suggesting any changes. Quite often the answer isn't a new diet at all. It's finding the handful of habits that have been hiding in plain sight, and deciding which ones are worth changing.

If you're over 40 and feel as though you're doing everything right without getting the result you'd expect, that's exactly the kind of problem we can look at together. You can book a free 30 minute consultation at Lightwater Leisure Centre, with no workout and no obligation, or email me at [email protected].

Rob Ede is a health-first personal trainer and Level 4 nutrition coach at Lightwater Leisure Centre, helping adults over 40 get stronger, healthier and more capable.

Related reading

• What Does a Nutrition Coach Actually Do, and Are You Making the Most of Yours?

• Why Am I Exercising But Not Losing Weight?

References (for the curious)

1. Lichtman SW, Pisarska K, Berman ER, et al. Discrepancy between self-reported and actual caloric intake and exercise in obese subjects. N Engl J Med. 1992;327(27):1893-1898.

2. Burrows TL, Ho YY, Rollo ME, Collins CE. Validity of dietary assessment methods when compared to the method of doubly labeled water: a systematic review in adults. Front Endocrinol. 2019;10:850.

3. Livingstone MBE, Black AE. Markers of the validity of reported energy intake. J Nutr. 2003;133(Suppl 3):895S-920S.

4. Macdiarmid J, Blundell J. Assessing dietary intake: who, what and why of under-reporting. Nutr Res Rev. 1998;11(2):231-253.

5. Kunda Z. The case for motivated reasoning. Psychol Bull. 1990;108(3):480-498.

6. Pontzer H, Yamada Y, Sagayama H, et al. Daily energy expenditure through the human life course. Science. 2021;373(6556):808-812.

7. Kwok A, Dordevic AL, Paton G, Page MJ, Truby H. Effect of alcohol consumption on food energy intake: a systematic review and meta-analysis. Br J Nutr. 2019;121(5):481-495.

8. NHS. Calories in alcohol.

9. Burke LE, Wang J, Sevick MA. Self-monitoring in weight loss: a systematic review of the literature. J Am Diet Assoc. 2011;111(1):92-102.

10. Raber M, Liao Y, Rara A, et al. A systematic review of the use of dietary self-monitoring in behavioural weight loss interventions: delivery, intensity and effectiveness. Public Health Nutr. 2021;24(17).

Medical disclaimer: This article is for general information and education only and is not a substitute for personalised medical advice, diagnosis or treatment. I am a qualified personal trainer and nutrition coach, not a doctor. Always consult an appropriate healthcare professional before making significant changes to your exercise, nutrition or medication, particularly if you have a medical condition, are pregnant, or take prescription medication.

Copyright © 2026 Rob Ede. You may quote brief excerpts from this article provided you include appropriate attribution and a link to the original. Please do not reproduce or republish the article in full without written permission.