Protein after 40: the requirement rises, appetite falls

The problem in one line

From around your forties, your body gets less out of the same meal. At the same time, appetite tends to fall.

Those two things pull in opposite directions. That is the whole issue.

Why the need rises

Younger muscle responds strongly to a modest amount of protein. Older muscle responds less to the same amount.

Researchers call this anabolic resistance. In plain terms, the signal that tells muscle to rebuild gets quieter with age.

Why intake tends to fall

Appetite often shrinks with age. Meals get smaller, and protein rich foods are frequently the first thing dropped.

Dental problems, medications and simply cooking for fewer people all play a part. None of it is a failure of willpower.

What actually helps

How much is enough

The honest answer is that it depends on your weight, your activity and your kidney health. A number that suits one person can be wrong for another.

The standard national guidance is set to prevent deficiency, not to protect muscle in later life. Those are different targets.

If you have kidney disease

This advice does not apply automatically. Reduced kidney function changes how much protein is appropriate.

Speak to your doctor before increasing your intake. This is one of the few places where more is not better.

Do you need a supplement?

Most people do not. Food covers it if the meals are arranged sensibly.

A shake is useful when appetite is genuinely poor, or after training when eating properly is not practical. It is a convenience, not a requirement.

Plant or animal?

Both work. Animal sources tend to be more concentrated, so plant based eaters need slightly more attention to variety and total amount.

Soy, tofu, tempeh, beans, lentils and dairy all contribute. Mixing sources across the day covers what any single one lacks.

What this looks like in practice

Add a protein source to breakfast. Keep one at lunch rather than eating bread alone. Do not rely on dinner to carry the day.

Then add two sessions a week of resistance work. That combination does more than either change alone.

A word on weight loss

When people lose weight, some of the loss is muscle. Keeping protein up during weight loss protects more of it.

That matters especially on a medically supervised programme, where weight can come off quickly. Your clinician should be watching for it.

The bottom line

From midlife the requirement rises while appetite falls. Nobody notices until strength is already gone.

Spread protein across the day, train against resistance, and get a target that fits you rather than a number from an article.