Protein Requirements: 0.7 to 1 g/kg Is Enough for Most?

For years, the fitness and nutrition world has pushed higher and higher protein targets, especially for people over 50. The message is clear: eat more protein or lose muscle.

After reviewing the latest human research, running my own experiment, and looking at real world patterns across cultures, I no longer accept that blanket claim.

My current position is simple. For most healthy and active people past 50, daily protein needs sit between 0.7 and 1.0 g/kg of body weight. Higher intakes can be useful in specific situations such as large calorie deficits, illness, recovery, or very demanding training, but they are not a universal requirement for maintaining or even building muscle.

1. Research Shows Muscle Can Be Maintained on Lower Protein

Until recently, the dominant view was that ageing creates anabolic resistance, meaning older adults need substantially more protein than the official RDA of 0.8 g/kg. New human data challenge how broadly that rule should be applied.

Controlled feeding trials show that when people are not in a large energy deficit or recovering from illness, increasing protein from the RDA range of about 0.8 g/kg to roughly 1.3 g/kg does not produce meaningful additional gains in lean mass. The extra protein appears to help mainly when the body is under clear stress, such as calorie restriction combined with training or recovery from inactivity.

In healthy older adults who are simply living, moving, and staying active, RDA level protein intake is often sufficient to support lean tissue – a new review:

A major 2026 review examining more than 350 studies found that moderate protein restriction improved metabolic function, increased FGF21, reduced several markers of cellular stress, and activated pathways linked to healthier ageing. The authors were careful to point out that active individuals still benefit from adequate protein for muscle repair.

These findings align with what many experienced coaches observe in practice. Once a meaningful training stimulus is present, the body becomes remarkably efficient at using the protein it receives from ordinary food. The idea that more protein is always better starts to look less like physiology and more like marketing.

2. My Own n = 1 Experiment

I decided to test this myself.

For years, whey protein, around one and a half scoops daily, was a staple in my diet whenever I was doing resistance training. I removed it completely, along with creatine, and relied only on home cooked food for this study. I did not deliberately add high protein foods and I did not track macros.

My average intake settled at roughly 60 to 75 grams per day. At 72 kg of body weight, that works out to approximately 0.83 to 1.04 g/kg.

Training was deliberately light for much of the period because of a local irritation near the medial epicondyle. Most sessions stayed in the 12 to 30 repetition range, and I avoided heavy loading.

Despite lower protein intake and lighter training, I not only maintained muscle, I increased it. Visual changes, and training performance all moved in a positive direction. The experiment is still ongoing, and I expect either further improvement or at least solid maintenance once the elbow fully recovers.

There are important limitations. I am a training professional and I prioritize training quality over calorie counting. That experience is a genuine advantage. This is still only one person and not a controlled study. I will get proper laboratory testing when possible.

However, within the limits of an n = 1 experiment, the result is clear: muscle can be built and maintained on a normal mixed diet without supplementation and without pushing protein intake above 1 g/kg.

3. Do Older People Need More Protein: Myth or Fact?

This is the claim that deserves the most careful examination.

The argument is straightforward. As people age, anabolic resistance increases, so more protein may be needed to stimulate muscle protein synthesis. Based on this idea, several expert groups recommend protein intakes of 1.0 to 1.2 g/kg or higher for adults over 65.

That recommendation is not without merit. However, it is often presented as an absolute truth when the supporting evidence is far more conditional.

When we look at real populations, the picture becomes more complex.

Traditional Indian diets, depending on persons appetite & their food choices (wheat Vs rice, how much lentil one eats, dairy or no dairy etc), often fall in the range of 0.5 to 0.8 g/kg, with most protein coming from cereals, lentils, dairy, and vegetables. Yet many people live into their eighties and nineties without the degree of frailty that some Western literature would lead us to expect.

At the same time, older Americans generally consume more absolute protein because of greater access to animal foods, yet sarcopenia and frailty remain common. Higher lifelong protein intake has clearly not solved the problem.

Frailty is driven by many factors. Physical inactivity, insulin resistance, chronic low grade inflammation, declining food quality, reduced appetite, and loss of high force movement patterns all play major roles.

Increasing protein while ignoring these factors often produces disappointing outcomes.

There is also a practical issue. When calorie intake falls, for example from 2,500 to 1,500 calories per day, forcing a very high percentage of those calories to come from protein can reduce the intake of other useful foods and nutrients and it may not be possible like it was not in case of my parents and a few uncles I experimented with.

Does older muscle still retain the capacity to grow?

Yes.

Under well supervised progressive resistance training, even people in their eighties and nineties have demonstrated measurable increases in muscle size.

However, the claim that the average older adult who starts resistance training will gain significant muscle mass is often overstated. Most unsupervised trainees never apply true progressive overload. Many struggle with appetite, recovery, or total energy intake. As a result, they often experience improvements in strength, coordination, balance, and function rather than substantial increases in muscle size.

Those improvements are extremely valuable. Increases in significant (that would matter for MPS) muscle mass are simply a much higher bar that most people in everyday conditions do not reach.

Bottom Line

Protein requirements are highly individual.

A trained 52 year old should not be compared with an average sedentary 52 year old, and neither should be compared with a frail 80 year old living in an energy deficit.

For many healthy and active people past 50, 0.7 to 1.0 g/kg from ordinary food is enough to maintain and even build muscle when the training stimulus is appropriate.

Higher protein targets have their place in specific situations, but they are not a universal necessity.

The human body is far more adaptive than the current protein narrative suggests.

Training quality, metabolic health, recovery, and consistent movement matter more than chasing ever higher protein targets.