Why Am I Gaining Weight When Nothing Has Changed?

Have a think about the last time you took the stairs at work.

Not the last time you meant to. The last time you actually did.

Most women I ask cannot remember, and it catches them off guard, because there was never a moment where they decided to stop. There was no day where the stairs got too hard. It just quietly became the lift, and it stayed the lift, and nobody noticed.

That sounds like a very small thing to open a blog with. It is not, and I am going to explain why, because it sits underneath one of the most common conversations I have with women in their forties and fifties. She has been training five days a week for years. She tracks her food and she is honest about it. She has a couple of wines on the weekend and nothing that would explain anything. And the weight has slowly, steadily crept on around her middle, and she cannot point to a single thing she has changed.

She is not wrong. She has not changed anything she can see.

The part of the day nobody counts

When we talk about how much energy you burn, most people think about two things. Your body ticking over, and your training. That is it. Session, or no session.

There is a third component and it is much bigger than people expect. It is all the movement in your day that is not exercise. Walking to the car. Standing at the kitchen bench. Carrying the shopping in. Taking the stairs. Getting up to find something instead of asking someone to bring it. Fidgeting, even. Researchers call it non-exercise activity thermogenesis, which is a horrible name, so I will just call it your incidental movement.

Here is the part that matters. It is the most variable component of your daily energy expenditure by a long way. Two women the same size, same age, same training program, can differ by several hundred calories a day on incidental movement alone. It is not a rounding error. For most women it is considerably bigger than the session they did that morning.

And unlike your training, which is timetabled and tracked and visible, incidental movement is completely invisible. You cannot feel it happening. You definitely cannot feel it stopping.

What it actually looks like in a real week

This is the part where women tend to go quiet on me, because it is very recognisable once someone says it out loud.

You park a bit closer to the shops than you used to. Saturday used to have a walk in it somewhere, and now Saturday has a lie down after the gym. You do not cook on the nights you train, because you get home and you genuinely cannot be bothered, so it is something quick or something delivered. You sit down after dinner to check one thing on your phone and the next time you look up it is half past nine. And at some point the lift stopped being the lazy option and just became the option.

Not one of those was a decision. You did not wake up one morning and choose to move less. Each one arrived on its own, over a period of years, in response to being tired.

I have done it to myself. In the phases where I have had a lot of cardio in my program, the session was never the problem. It was everything after it. I would train hard in the morning and then be a statue until bedtime, and it took me months to work out what was going on, and I do this for a living.

Why the tiredness is the mechanism, not the side effect

This is the bit I most want you to take away.

When you increase your training load, particularly when you add cardio on top of a program you are already doing, your body does not simply absorb the extra cost and carry on as normal. It looks for savings. And it finds them in the places you are not watching, which is every hour of the day that is not the session.

That is why the fatigue matters so much. Fatigue is not just an unpleasant feeling to push through. It is the thing driving the behaviour. A tired body sits down. A tired body takes the lift. A tired body orders in rather than standing at a chopping board for forty minutes. None of it registers as a choice, because it does not feel like one.

So the woman who adds four cardio sessions a week to break a stall can genuinely end up spending less energy across the whole week than she did before she added them. She has bought an hour and paid for it with twenty three.

Why your calorie number stopped being right

Now put those two things together.

Your calorie number, whether a coach set it, an app calculated it, or you worked it out yourself, was based on a level of daily activity. Not just your training. Your whole life.

That number was set for a woman who moved more across her day than you do now. Same food going in. Same sessions in the diary. A smaller total going out, because the twenty three hours around the sessions have quietly emptied out.

And you would never see it, because everything you can see is identical. Your program is the same. Your tracking is the same. Your discipline has not moved an inch.

It also does not sit still. You are tired, so the quality of your sessions drops off a little. Nothing shifts on the scale, so you add more cardio, because that is the lever everybody reaches for. Which makes you more tired. That loop can run for years and each turn of it makes the next one worse.

Where age and perimenopause actually fit

I am not going to tell you that none of this is hormonal, because that would be rubbish.

Perimenopause changes what your body can recover from, and it usually changes your sleep first. Less recovery and worse sleep mean more fatigue, and you now know what fatigue does to the rest of your day. So hormones are absolutely part of this. They are just not part of it in the way most women assume.

Your body has not stopped responding. Your maintenance has come down, part of that is hormonal, part of it is the movement that has drained out of your week, and the plan you are running was written for the version of you that existed before either of those things happened.

That is a number problem. Number problems get fixed.

What to do about it

The reason this is worth knowing is that you cannot fix it by trying harder, and you were never slacking, so trying harder was never going to work anyway.

Three things are worth doing, in this order.

Find out where the movement went. Not with a step target and not as a new discipline project. Just look honestly at a day you train and a day you do not, and notice what the rest of those days actually contained. Most women can name the leak within about five minutes of looking.

Then deal with the fatigue rather than adding to it. For a lot of women that means less cardio, not more, which is the opposite of what she has been told for a decade. If the training is what is flattening the other twenty three hours, the training is where the fix starts.

Then reset the number to the life you actually have now, including the weekends, and stop running on one written for a woman who took the stairs.

If you have been doing everything right for years and going backwards anyway, this is one of the first places I look. If you want me to look at yours, book a Kickstarter call and we will go through it.