Why muscle matters more as you get older

Muscle matters more as you age because it does much more than move you around. It helps control blood sugar, protects your joints and bones, keeps you steady on your feet and lets you stay independent. Muscle tends to decline gradually from middle age if it isn't used, but it responds to the right kind of activity at any age.

What happens to muscle over time

From around middle age, most people slowly lose muscle mass and strength unless they actively work to keep it. The change is gradual enough that you rarely notice it year to year. It tends to show up later as stairs feeling harder, carrying shopping being more of an effort, or getting up from a low chair taking a push.

When the loss of muscle and strength becomes significant enough to affect everyday function, doctors call it sarcopenia. It's more common in older adults, but the process that leads there starts much earlier. Inactivity, illness, time in hospital, poor appetite and some chronic conditions can all speed it up.

Muscle and blood sugar

Muscle is one of the main places your body stores and uses glucose after a meal. More muscle, and muscle that's regularly used, gives sugar somewhere useful to go. That's one reason why staying active is so closely linked with better blood sugar control.

When muscle declines and activity drops, the body can find it harder to keep blood sugar in range, and insulin has to work harder. Our article on what insulin resistance is explains how that pattern develops.

Strength, balance and falls

Leg strength and balance go hand in hand. Weaker muscles make it harder to catch yourself when you trip, and falls become a much bigger concern with age because they can lead to fractures and a loss of confidence and independence.

Muscle also works alongside bone. When muscles pull on bones during activity, it helps keep bones strong. Weight-bearing and resistance exercise support both at the same time.

Muscle, metabolism and energy

Muscle uses energy even at rest, so losing it can make it easier to gain fat over time, especially around the middle. People sometimes notice their body shape changing in their 40s and 50s even when their weight hasn't moved much. That shift often reflects less muscle and more fat.

Low muscle strength can also feed into feeling tired, as everyday tasks take a bigger share of your capacity. If ongoing tiredness is part of your picture, our article on why you might always be tired looks at the wider list of causes.

What helps keep muscle

The foundations are well established and don't need to be complicated.

• Resistance exercise. Muscles respond to being worked against resistance, whether that's weights, resistance bands, bodyweight exercises like squats and push-ups, or carrying and lifting in daily life. Australia's guidelines suggest muscle-strengthening activities on at least two days a week.
• Gradual progression. Muscles adapt to what they're asked to do, so the effort needs to build slowly over time. Starting light and increasing gradually also lowers the risk of injury.
• Regular movement. Walking, cycling and other aerobic activity support your heart and general fitness, and reducing long periods of sitting helps too.
• Enough protein across the day. Muscle needs protein from food. Including a protein source at each meal, such as eggs, dairy, fish, meat, legumes or tofu, is a sensible general approach. Some people, especially older adults with poor appetite, may not get enough without realising.
• Balance work. For older adults, activities like tai chi or simple balance exercises are encouraged alongside strength work.
• Sleep. Good sleep supports recovery from exercise and general health.

If you have a health condition, joint problems or haven't exercised in a long time, it's worth checking with a doctor before starting, and a physiotherapist or exercise physiologist can help you set up a safe program.

Signs muscle loss might be affecting you

Some changes are worth paying attention to. Finding it hard to get up from a chair without using your arms, a slower walking pace, difficulty opening jars or lifting things you used to manage easily, or unintentional weight loss can all be signs that muscle strength is dropping. A doctor can look at possible contributing factors, which may include checking things like vitamin D, thyroid function, iron levels and overall nutrition.

How UHD BioHealth can help

UHD BioHealth is a doctor-led telehealth service available across Australia. You start with a detailed online questionnaire, and an AHPRA-registered doctor reviews it within 24 hours. Where it's useful, your doctor will recommend bloodwork you can do locally, then you receive a written, personalised plan with every cost listed before you pay anything, checked by a second, independent doctor, with follow-up care along the way. See what a doctor looks at for healthy ageing.