Does protein help with holding on to muscle as you age?

Older bodies get less out of the same amount of protein, so eating more of it, with training, is how muscle is kept.

Does protein help with feeling full?

Protein at meals is filling for many of us, though how much that changes weight over a year is less settled.

Protein: what the evidence says

The short answer

For holding on to muscle as you age: works: Older bodies get less out of the same amount of protein, so eating more of it, with training, is how muscle is kept.
For feeling full: might help: Protein at meals is filling for many of us, though how much that changes weight over a year is less settled.

What it is

A nutrient in meat, fish, eggs, dairy, beans, pulses, tofu, nuts and seeds. Powders are just a convenient form of it, not a different thing.

What the studies say

An international group of researchers, the PROT-AGE study group, reviewed the evidence on protein and aging.
They found that older bodies handle protein differently and get less muscle building out of the same meal.
They set out an average daily intake of at least 1.0g to 1.2g of protein for every kilogram of body weight for people over 65, to keep lean body mass and function.
They put the figure higher, at 1.2g per kilogram a day or more, for people who are exercising, and higher again during illness.
They also recommended both endurance and resistance exercise, at a level that is safe for the person.
The NHS Eatwell advice puts beans, pulses, fish, eggs and meat as one of the five food groups to build meals from.

How much people take in trials

The PROT-AGE group suggested at least 1.0g to 1.2g per kilogram of body weight a day for people over 65, and 1.2g or more for those who exercise.

This is what the research used. It is not a dose for you.

What a label is allowed to say

UK law only lets a supplement say what is on the official list. For this one, that is:

Protein contributes to the maintenance of muscle mass
Protein contributes to a growth in muscle mass
Protein contributes to the maintenance of normal bones

The food has to be a real source of protein for the claim to be used.

In the US the rules are looser. A label may say how a nutrient supports the body if the company holds evidence for it. The FDA does not check the claim first, which is why US labels carry the line saying the FDA has not evaluated it.

Safety

For most healthy people, more protein from food is not a problem.
If you have kidney disease, protein needs to be set by your own team, not by a guideline for healthy adults.
Powders are food supplements and are not tested the way medicines are. A simple one with a short ingredients list is easier to check.
Protein does nothing for muscle on its own. The evidence pairs it with resistance exercise.

Ask your doctor first if

You have kidney disease or have been given a protein limit.
You have liver disease.
You are losing weight without meaning to.

This is general information, not medical advice. Check with your doctor or pharmacist, especially if you take medication.

Sources

Checked against these sources on 2026-09-19.

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