Keeping Muscle While You Lose Fat

When the scales start moving, it feels like a win — and it is. But not all weight loss is equal. Lose too fast, or without the right habits, and a meaningful chunk of what you drop is muscle, not fat. The goal is a leaner, stronger body that stays that way. Two habits protect it.

Why muscle loss happens

GLP-1 medications suppress appetite — often dramatically. In a big energy deficit, if your body can't get everything it needs from fat stores, it breaks down muscle for fuel. Add lower energy and less training, and the conditions for muscle loss are set. The fix isn't slowing the medication down — it's being deliberate about what you eat and whether you train.

Habit one: protein first, every meal

When appetite drops, protein is usually the first casualty — and protein is the raw material your body uses to keep muscle. A widely used target while losing weight is around 1.6–2.2 g of protein per kilogram of body weight per day; your care team can tailor that to you. In practice: eggs or Greek yoghurt at breakfast, chicken, fish or legumes at lunch and dinner. When you can only manage a small plate, fill it with protein before anything else. Eating to support your treatment goes deeper.

Habit two: give your body a reason to keep muscle

Your body holds on to muscle when you use it. The clearest signal is resistance training — weights, bands, or bodyweight work that genuinely challenges you. Two to three sessions a week across the major muscle groups is enough; 30–40 minutes does the job. New to it? Training: where to start has a simple way in.

Don't lose too fast

A steady downward trend beats a dramatic one — very rapid loss costs disproportionately more muscle, and poor sleep makes it worse by driving hunger hormones up and recovery down. If the scales are dropping fast and your training is flat, that's worth a conversation at your check-in.

Message the care team if

• You can't get anywhere near your protein target because of low appetite.
• You're losing very quickly and feeling weak or flat.
• You want your protein and training plan tailored properly.

The medication handles the appetite. Protein and training decide what kind of weight you lose. Keep all three working together and the result is the body you actually want.