For years, weight loss has been treated as a numbers game: eat less, move more, watch the scales go down. But the number on the scales only tells us part of the story.
What really matters is the kind of weight we’re losing. Body recomposition focuses on reducing body fat while protecting — or even building — our muscles that support strength, mobility, bone health and long-term independence.
And with GLP-1 medications now helping more women achieve significant weight loss, this distinction has become especially important. Rapid weight loss can include muscle as well as fat, particularly if appetite drops and nutrition or exercise fall by the wayside.
So, how can we lose excess fat without sacrificing the muscle and bone we’ll rely on for decades to come? Here’s how to make healthy ageing part of the plan.
What is body recomposition?
Body recomposition shifts the focus away from simply losing weight towards changing what our weight is made up of.
“When most women say, ‘I’d like to lose a bit of weight,’ what they usually mean is ‘I’d like to lose some body fat,’” explains Bertie Stringer, nutritionist and founder of Metamorphys, a wellness brand that supports women using GLP-1 medications. “Your weight is made up of fat, muscle, bone, water and other tissues. That’s your body composition.
“Body recomposition means deliberately changing that balance: reducing body fat while preserving, or ideally building, muscle.”
The distinction matters because two identical numbers on the scales can tell very different health stories.
Personal trainer Carly Corrigall, who specialises in working with midlife women, gives a simple example: “Two women each lose 10kg. One loses that mostly through body fat, while holding on to her muscle. The other loses a significant amount of muscle, as well as fat. Those are not equivalent outcomes from a healthy-ageing perspective.”
So, with body recomposition, success isn’t necessarily the fastest-dropping number — it’s losing fat while keeping valuable lean tissue intact.
Why protecting muscle matters more in midlife
Midlife is already a time when women become more vulnerable to losing both muscle and bone. Falling oestrogen accelerates bone loss around menopause, while age-related muscle loss can gradually chip away at strength and mobility.
“Muscle and bone are our longevity infrastructure,” says Bertie. “We’re not protecting them for the body we have at 50. We’re protecting them for the life we want at 70, 80 and beyond.”
That matters even more when weight is coming off quickly. “GLP-1 medications can produce substantial overall weight loss and significantly reduce appetite and food intake,” explains Carly. “So protecting muscle through adequate nutrition and resistance training becomes particularly important.”
Muscle also supports balance, metabolic health and everyday function, while strong bones help protect against fractures later in life. The goal, then, isn’t to become as light as possible — it’s to lose excess fat while preserving the tissue that keeps us strong and capable.
How to eat for fat loss without sacrificing muscle
So, how do we eat for fat loss while still protecting our all-important muscles? Here are three practical tips.
1. Prioritise protein
Protein provides the raw materials muscles need to repair and rebuild, so it deserves a regular spot on the plate when you’re losing fat. Rather than saving most of it for dinner, aim to spread protein-rich foods across the day.
“Protein gives your body the building blocks for muscle; resistance training gives it a reason to keep it,” says Bertie. Your individual needs will vary, but eggs, Greek yoghurt, fish, poultry, tofu, beans and lentils are all good places to start.
2. Aim for a gentle calorie deficit
Fat loss requires us to use more energy than we consume — but that doesn’t mean eating as little as possible. Start with modest changes, such as slightly reducing portion sizes or cutting back on foods and drinks that add plenty of calories without much nutritional value.
The aim is a sustainable deficit that still leaves you with enough fuel to exercise, recover and meet your nutritional needs — not the fastest possible drop on the scales.
3. Eat a balanced plate
Protein may be getting top billing, but it shouldn’t push other essential nutrients aside. Dietitian Dr Theresa DeLorenzo, founder of Nutrition for Optimal Performance, recommends “combining protein with fibre-rich carbohydrates to help support fullness and avoid blood sugar imbalances.”
She also advises eating plenty of fruit, vegetables and wholegrains, while keeping hydration up. And don’t forget your bones: calcium-rich foods and adequate vitamin D are particularly important for women in midlife.
The key thing to remember is that if portions are smaller, the food on the plate needs to do plenty of nutritional heavy lifting.
How to move for body recomposition
Of course, nutrition is only half the story. Here’s how you can move to help shift excess fat and protect your muscles.
Make resistance training the priority
If fat loss is the goal, it’s tempting to focus on the workouts that burn the most calories. But for body recomposition, keeping muscle has to come first.
“I wouldn’t judge a workout by how many calories your fitness tracker tells you you’ve burned,” Carly says. “The most valuable exercise you can do is the one that nudges the body to keep its muscle and helps to build bone.”
Aim for resistance training twice a week, using weights, bands or bodyweight moves such as squats, lunges and press-ups. The key is gradual progression: once an exercise feels easy, make it a little more challenging.
Keep moving — and add some impact if you can
Cardio still matters for heart health, fitness and metabolic wellbeing. Whether your cardio of choice is walking, cycling, swimming or dancing, it still has a place alongside strength work.
For bone health, Carly also recommends adding some impact where appropriate. “Skipping, bounding or jumping provides a different stimulus to the bones than strength training, and ideally you want both.”
That doesn’t need to mean intense plyometrics. A few small jumps, hops or brisk stair climbs can be enough to add a useful bone-loading stimulus, provided they’re suitable for you.
The takeaway
Body recomposition is about reducing excess fat while holding onto the muscle and bone that will keep us strong, mobile and independent for years to come.
That becomes particularly important in midlife, whether you’re losing weight with or without GLP-1 medication. Prioritising protein, eating a nourishing diet, regular resistance training and keeping active all help stack the odds in favour of healthier fat loss.
Think of the scales as just one piece of information. The bigger win is emerging from weight loss feeling well nourished, capable and strong — with your future health firmly in hand.
