Protein seems to be everywhere these days — blended into smoothies, packed into snack bars, and even added to coffee creamers. With so much attention on protein, it’s natural to wonder: How much do you actually need?
For most healthy adults, the Recommended Dietary Allowance (RDA) for protein is 0.8 grams per kilogram of body weight per day. This recommendation was developed to prevent protein deficiency.
For a person who weighs 150 pounds, that equals about 55 grams of protein per day.
But there’s an important distinction: Preventing deficiency is not the same as optimizing health.
As we age, our bodies become less efficient at using protein to build and maintain muscle. Researchers call this phenomenon anabolic resistance. Simply put, as we get older we need more protein to build and maintain muscle.
Because of this, several expert groups now recommend:
- 1.0 to 1.2 grams per kilogram per day for adults older than 65
- 1.2 to 1.5 grams per kilogram per day for older adults with chronic illness
These recommendations are designed to help preserve muscle mass, maintain strength, and reduce the risk of frailty.
Why does this matter? Starting in midlife, adults lose approximately 3% to 8% of their muscle mass per decade, and that loss accelerates after age 60. Declining muscle mass is associated with increased risk of falls, reduced mobility, hospitalization, and loss of independence.
Research consistently shows that higher protein intake — especially when paired with resistance exercise — helps older adults maintain muscle and strength.
Protein and weight loss
Protein becomes even more important when weight loss is the goal.
When people reduce calories to lose weight, they often lose muscle along with body fat. Studies suggest that consuming a moderately higher amount of protein — about 1.2 to 1.6 grams per kilogram per day — helps preserve lean muscle mass during weight loss.
Research also shows that higher-protein diets may lead to slightly greater fat loss and better muscle retention during the early stages of weight loss. However, these benefits are generally modest.
Long-term success depends more on consistency. The best eating plan is one you can sustain.
What about high-protein diets?
One common concern is whether eating more protein can harm the kidneys.
Current evidence suggests that, in healthy adults, moderately higher protein intake does not appear to negatively affect kidney function.
However, people with advanced chronic kidney disease often need individualized nutrition plans and may need lower protein targets. If you have kidney disease or another chronic health condition, talk with your healthcare provider before making significant dietary changes.
The takeaway: More protein isn’t always better, but slightly more than the minimum recommended amount may provide meaningful benefits for some people.
How much Is “enough” in real life?
For a 150-pound adult:
- Minimum (RDA): Approximately 55 grams per day
- Muscle-support range: Approximately 70 to 85 grams per day
Researchers also suggest that spreading protein intake throughout the day may be more beneficial than consuming most of it at dinner. Aiming for 25 to 30 grams of protein per meal can help maximize muscle protein synthesis, particularly in older adults.
A sample day of protein intake
Breakfast (approximately 24 grams of protein)
- 1 cup of Greek yogurt with nuts
Lunch (approximately 26 grams of protein )
- 3 ounces of grilled chicken
- Whole-grain roll
Snack (approximately 8 grams of protein)
Dinner
(approximately 33 grams of protein
- 4 ounces of baked salmon
- 1 cup of quinoa
Total: Approximately 85 to 90 grams of protein
Notice that protein is distributed throughout the day rather than concentrated in a single meal.
Why consistency matters
Protein isn’t just about building muscle or following the latest nutrition trend. Adequate protein intake supports several aspects of healthy aging, including:
- Preserving muscle mass
- Supporting metabolism
- Maintaining bone health
- Reducing frailty risk
- Protecting independence and physical function
Large population studies have found that older adults who consume approximately 1.0 to 1.2 grams of protein per kilogram per day are less likely to become frail than those who consume less than 0.8 grams per kilogram.
Of course, protein works best when paired with regular physical activity, particularly strength or resistance training.
The bottom line
The current RDA of 0.8 grams of protein per kilogram of body weight per day is enough to prevent deficiency in most healthy adults.
However, emerging research suggests that certain groups may benefit from modestly higher protein intake, including:
- Adults older than 50
- People trying to lose weight
- Physically active individuals
- Those recovering from illness or injury
The right amount of protein depends on your age, activity level, overall health, and personal goals.
If you're unsure how much protein is right for you, talk with your primary care provider or a registered dietitian. Together, you can develop a nutrition plan that supports long-term strength, mobility, and overall health — not just short-term goals.