You've probably heard two opposite things. One camp says Americans already eat plenty of protein. The other says you need a shake after every meal. If you're over 40 and want to stay strong, neither answer helps much.
So here's the real question: how much protein do you need to keep your muscle as you age, and how do you get it without making food your second job? Let's walk through it.
Why protein matters more after 40
Starting somewhere in your mid-30s, most people slowly lose muscle. The medical term is sarcopenia. Harvard Health notes that the loss speeds up after about age 60, and adults who don't strength train can lose several pounds of muscle per decade.
That matters for more than looks. Muscle helps you climb stairs, carry groceries, manage blood sugar, and catch yourself when you trip. Stronger muscles are linked with a lower risk of falls.
Two things slow that loss down: strength training and enough protein. Protein gives your body the raw material to repair and build muscle. Training gives it a reason to.
Older muscle also gets a little "deaf" to protein. Researchers call this anabolic resistance. In plain terms, you need a bit more protein per meal to get the same muscle-building signal you got at 25.
What the evidence says
The RDA is a floor, not a goal. The official recommendation for adults is 0.8 grams of protein per kilogram of body weight per day. That's about 0.36 grams per pound. It was set to prevent deficiency, not to help you hold on to muscle as you age.
Expert groups recommend more for older adults. In 2013, an international panel called the PROT-AGE Study Group reviewed the research and recommended:
Healthy adults over 65: at least 1.0–1.2 g per kg per day
Active or exercising older adults: at least 1.2 g per kg per day
People with acute or chronic illness: 1.2–1.5 g per kg per day
These targets were written for people over 65. For people in their 40s and 50s, the evidence is less direct. But muscle loss is already underway by then, so aiming for the same range is a reasonable, low-risk choice.
If you lift, there's a ceiling. A large 2018 review in the British Journal of Sports Medicine pooled 49 trials with nearly 1,900 people doing resistance training. Extra protein helped people gain more muscle and strength. But the benefit leveled off around 1.6 g per kg per day. Going higher didn't add more muscle on average.
The same review found something worth knowing: protein alone did less for older adults than for younger ones. Translation? Protein supports the training. It doesn't replace it.
Spreading it out probably helps. Many people eat a light breakfast, a modest lunch, and most of their protein at dinner. Groups like the National Council on Aging suggest aiming for about 20–30 grams at each meal instead. The research on timing isn't settled, and PROT-AGE said so. But it's an easy habit, and it makes hitting your daily total much simpler.
What to actually do
1. Find your number. Take your weight in pounds and multiply by:
0.45–0.55 if you're mostly sedentary or lightly active (about 1.0–1.2 g/kg)
0.55–0.7 if you strength train regularly (about 1.2–1.6 g/kg)
Example: a 180-pound person would aim for roughly 80–100 grams a day. If they lift three times a week, 100–130 grams is a smart range. If you carry a lot of extra body fat, use your goal weight instead.
2. Build each meal around a protein. Roughly 25–40 grams per meal does the job for most people. Here's what that looks like:
3 eggs plus a cup of Greek yogurt (about 35 g)
A palm-and-a-half of chicken, fish, or lean beef, about 4–5 oz cooked (about 30–40 g)
A cup of cottage cheese (about 25 g)
A can of tuna or salmon (about 20–25 g)
A cup of cooked lentils plus half a block of firm tofu (about 35 g)
3. Fix breakfast first. This is where most of my clients come up short. Toast and coffee is maybe 5 grams. Swap in eggs, Greek yogurt, or cottage cheese and you've closed a big part of the gap.
4. Use a shake as a tool, not a crutch. Protein powder is just convenient food. It's handy on busy days. If you buy one, pick a brand with third-party testing, like NSF Certified for Sport, since supplements aren't checked by the FDA before they're sold.
5. Lift something. Two to three strength sessions a week is what turns that protein into muscle. Without the training, most of the benefit goes unused.
Who should be careful
People with kidney disease. This is the big one. Moderately higher protein appears safe for healthy kidneys, but people with advanced chronic kidney disease often need to limit protein. Talk to your doctor before changing anything.
People with diabetes or other chronic conditions. Check with your doctor or a registered dietitian, since they may already be watching your kidney function.
Anyone recovering from surgery or a major illness. Your needs may be higher than the ranges above. Ask your care team for a specific target.
People who don't eat much overall. If your appetite is small, protein can crowd out other foods. Aim for balance, not just a number.
Coach's take
When a new client over 40 tells me they've been training hard but feel soft and tired, the first thing I check is breakfast. Nine times out of ten, they're eating less than half the protein they need before lunch. We don't overhaul their diet. We add one solid protein to each meal and keep the lifting consistent. Within a couple of months, they're stronger, less snacky, and recovering better between sessions.
You don't need to obsess over grams. Get roughly in the right range, spread it across your meals, and pick up some weights. That combination is one of the best things you can do for how you'll move at 60, 70, and beyond.
Ready to build strength that lasts?
If you want a plan built around your body, your schedule, and your goals, I can help. I offer mobile 1-on-1 training across Northern Virginia and DC, plus app-based online coaching wherever you are. Book a session or start coaching at zenithstrong.com.
Sources
This post is for educational purposes and isn't medical advice. Talk with your doctor before making major changes to your diet, especially if you have a medical condition.