How to keep muscle while you lose weight

Published 12 October 2026 by the BettaHabit team. General information, not medical advice.

When you lose weight, not all of it is fat. Some can be muscle, and muscle is worth keeping: it supports your joints, your balance, your blood sugar and how much you can do as you get older. Four habits make the biggest difference.

The short version

Eat protein at every meal, not just at dinner.
Do strength training at least twice a week.
Consider creatine, one of the most researched supplements available.
Sleep enough, and don't try to lose weight too fast.

1. Eat enough protein, spread through the day

Your muscles need protein to repair and rebuild. When you're eating less overall, it's easy to eat less protein too, just when you need it most.

Expert groups suggest that older adults aim for at least 1.0 to 1.2 g of protein per kilogram of body weight a day, and more when they're unwell or recovering. Needs during weight loss are often higher. A dietitian can set a number that fits you, especially if you have kidney disease, where protein targets need care.

Spreading it out helps. Aim for a palm-sized portion at each meal, such as eggs, chicken, fish, beans or lentils, yoghurt or maas, or a protein shake if mornings are rushed.

2. Lift something, twice a week

Strength training is the clearest signal you can send your body to keep muscle. It doesn't need a gym: squats to a chair, push-ups against a wall, and carrying shopping bags all count, as long as they get harder over time.

Start with two sessions a week of 20 to 30 minutes, working the legs, back, chest and arms. If you have a heart condition, joint problems or haven't exercised in a long time, check with your doctor first.

3. Consider creatine

Creatine monohydrate is one of the most studied supplements in sports nutrition. A position statement from the International Society of Sports Nutrition concludes that it improves performance in short, high-intensity exercise and that a daily dose of 3 to 5 g is safe for healthy adults.

It works by building up in your muscles over three to four weeks, so it needs to be taken daily, training day or not. It can add a little water weight at first, which is worth knowing if you're watching the scale. If you have kidney disease, speak to your doctor before taking it.

4. Sleep, and go steady

Short sleep makes it harder to recover from training and easier to overeat. A regular sleep window, even at weekends, is one of the most useful habits you can build.

Very fast weight loss tends to cost more muscle. Steady progress, with protein and strength work alongside, protects it better. Your doctor and dietitian can help you find a pace that suits your health.

Where our supplements fit

Build combines 25 g of whey protein with 3 g of creatine monohydrate in one scoop, which covers two of these habits at once. It's a convenience, not a requirement: food first, supplements where they help.