Protein After 50: How Much You Need to Keep Muscle (and Why Exercise Decides)

Muscle is the tissue that moves you. It helps you climb stairs, get up from a chair, carry groceries and catch yourself when you trip. Over time, many people lose some muscle strength and mass. Researchers call the serious form sarcopenia, a term for significant loss of muscle strength and function with age.

Sarcopenia affects almost one in three older people, according to an Australian and New Zealand guideline summary [R08]. The same summary is clear that losing muscle is not inevitable, and that resistance exercise is the first-line approach. No drug exists for it. That is good news, because the tools are ones you already have.

• Resistance training in older adults counters loss of muscle strength and mass, and supports function, mobility, independence and quality of life [R06]. Exercise is the main driver.
• Healthy older adults are commonly advised to take in about 1.0 to 1.2 grams of protein per kilogram of body weight a day. People who are ill or at risk of malnutrition may need 1.2 to 1.5 grams. All older people are advised to include daily physical activity, including resistance exercise [R09].
• An Australian and New Zealand guideline summary suggests 1 to 1.5 grams per kilogram may be considered for older adults with sarcopenia, excluding those with significant kidney disease. It notes that protein helps mainly when combined with resistance exercise [R08].
• The WHO recommends adults do muscle-strengthening activity on at least two days a week. Adults 65 and over should also do multicomponent activity that emphasises balance and strength on at least three days a week [R07].

For a 70 kg (about 154 lb) adult, the healthy-older-adult range works out to roughly 70 to 84 grams of protein a day. That is an illustration, not a prescription. Your own needs depend on your health, appetite and kidneys.

• Eating enough protein from food (eggs, fish, dairy, beans, lean meat): moderate support, mainly as a partner to resistance exercise [R08, R09].
• Protein powders and shakes: limited evidence that they do more than protein from food. They can be useful if you struggle to eat enough, but ask a dietitian first.
• Resistance exercise: the strongest support of the three [R06].

Medication note: Talk to your pharmacist or doctor before adding protein powder or any other supplement if you take blood thinners or other medication. If you have kidney disease, check with your clinician before increasing protein, because the guidance above does not apply to significant kidney disease [R08].

1. Build protein into meals you already eat. Aim for a palm-sized portion at each meal, from eggs, fish, dairy, beans, tofu or lean meat.
2. Pair protein with strength work, not instead of it. Resistance exercise is the part with the strongest support [R06].
3. Start with seated strength options if standing feels unsteady. Chair-based movements count.
4. Do shoulder and upper-back movement most days, using controlled range. A short routine is better than none.
5. Track your intake for a week with a dietitian or clinician if you are unsure. Many people guess too low or too high.
6. Review your plan with your clinician every few months, especially if your appetite or weight changes.