Protein might be the least controversial part of bodybuilding nutrition. We need it. The arguments usually start when someone asks: how much?
That's an especially useful question as we get older because maintaining muscle becomes increasingly important, resistance training remains one of our best tools for doing it, and protein provides the amino acids needed to support muscle protein remodeling.
The answer isn't one magic number. But the research gives us a useful range to work with.
START WITH THE RDA — THEN UNDERSTAND WHAT IT MEANS
The standard Recommended Dietary Allowance for adults is 0.8 grams of protein per kilogram of body weight per day.
That number is useful as a basic population-level reference, but it shouldn't automatically be interpreted as the ideal target for every person trying to maximize muscle retention, recovery or resistance training adaptations.
Expert groups focused specifically on aging have recommended higher intakes for older adults.
"Enough to avoid inadequacy" and "a useful target for someone who trains hard" aren't necessarily the same question.
WHAT DO OLDER-ADULT RECOMMENDATIONS SAY?
The PROT-AGE Study Group has recommended roughly 1.0 to 1.2 grams per kilogram per day for healthy adults over 65, with at least about 1.2 g/kg/day suggested for people who exercise or are otherwise physically active.
Similar recommendations have been published by an expert group from the European Society for Clinical Nutrition and Metabolism.
These aren't bodybuilding commandments, and they weren't written specifically for 50-year-old lifters. But they illustrate an important point: organizations studying healthy aging have questioned whether the basic 0.8 g/kg target is the best goal for maintaining muscle and function in older adults.
WHAT IF YOU ACTUALLY LIFT?
Resistance training changes the conversation because you're deliberately creating a stimulus for muscle adaptation.
A recent randomized trial in older adults undergoing progressive resistance training found that increasing protein intake did not produce dramatic additional improvements across every participant and every outcome.
But there was an important detail: additional protein improved leg-press strength among participants whose habitual protein intake was below 1.2 g/kg/day, with the clearest benefit appearing among those starting with particularly low protein intake.
That's a useful reminder that supplementation tends to have the greatest opportunity to help when it corrects something that's actually missing.
Before worrying about the perfect protein target, make sure you're not simply under-eating protein in the first place.
MORE ISN'T AUTOMATICALLY BETTER
Once you're eating enough protein to support your goals, continually adding more doesn't guarantee continually better results.
Protein still contains calories. Your overall diet still matters. Carbohydrates and dietary fats still matter. Training still matters. Sleep still matters.
You don't win bodybuilding nutrition by finding the largest number of grams you can fit into a day.
DON'T IGNORE TOTAL CALORIES
Protein doesn't operate in isolation.
Someone maintaining body weight, someone trying to gain muscle and someone dieting aggressively are working under different nutritional conditions.
During a calorie deficit, keeping protein intake adequate becomes particularly useful because the goal is usually to lose body fat while retaining as much lean tissue and training performance as practical.
But even then, protein can't completely rescue a diet that is unnecessarily extreme.
DOES PROTEIN TIMING MATTER?
Timing can matter, but it shouldn't distract from the bigger target: getting enough total protein across the day.
Rather than consuming almost no protein for most of the day and then trying to fix everything with one enormous dinner, spreading protein-containing meals across the day is a practical approach.
You also don't need to panic if a protein shake isn't waiting for you the second the final dumbbell hits the rack.
FOOD FIRST. SHAKES WHEN THEY'RE USEFUL.
Meat, poultry, fish, eggs, dairy, soy and other protein-rich foods can all contribute toward your daily intake.
Protein powder is simply another convenient food option. It's useful when convenience makes it easier to reach your target.
A shake isn't automatically better than food, and food isn't automatically superior because you had to chew it.
Build meals around a meaningful protein source, hit a reasonable daily total, and spend the rest of your energy actually training.
WHAT ABOUT KIDNEY HEALTH?
Protein recommendations need to be individualized for people with kidney disease or other medical conditions that affect protein requirements.
In particular, people with significant chronic kidney disease may be advised to limit protein depending on their condition and treatment. That's a medical nutrition question rather than something to determine from a gym calculator.
If you've been diagnosed with kidney disease or have been given a medically prescribed protein restriction, work with your clinician or registered dietitian before substantially changing your intake.
SO HOW MUCH DO YOU ACTUALLY NEED?
There isn't one number BUILT50 can honestly claim is perfect for every person over 50.
The standard adult RDA gives us a baseline of 0.8 g/kg/day. Expert groups studying older adults commonly recommend around 1.0–1.2 g/kg/day for healthy older people and approximately 1.2 g/kg/day or more for active older adults.
Lifters may choose targets within or above those ranges depending on body composition, total calorie intake, training volume, goals and individual circumstances.
The bigger lesson is simpler: eat enough protein consistently, resistance train, and stop letting tiny nutritional details distract you from the things producing most of the result.