Here’s something a lot of people don’t realize: most adults are significantly under-eating protein, and they’re feeling the consequences every single day without connecting the dots.
Low energy in the afternoon. Hunger that comes back two hours after eating. Slow progress in the gym despite consistent effort. Muscle loss that creeps up quietly through your 40s and 50s. A lot of these experiences trace back to not eating enough protein.
Protein is having a genuine moment in wellness conversations right now, and for good reason. The research has gotten clearer over the past few years, and the old recommendations that many of us grew up with are looking increasingly conservative.
How Much Protein Do You Actually Need?
The official RDA for protein is 0.8 grams per kilogram of body weight per day. For a 150-pound person, that’s about 55 grams. That number is designed to prevent deficiency, not to optimize health. There’s a real difference between those two goals.
Newer research suggests that for adults who are active, trying to maintain or build muscle, managing their weight, or over the age of 40, the optimal intake is closer to 1.6 to 2.2 grams per kilogram of body weight. For that same 150-pound person, that’s 108 to 150 grams per day. That’s more than double the RDA. And most people aren’t getting even half of it.
What Eating More Protein Actually Does
Keeps You Full for Hours
Protein is the most satiating macronutrient by a wide margin. It suppresses ghrelin, your hunger hormone, and stimulates peptide YY and GLP-1, which signal fullness to your brain. Studies consistently show that increasing protein intake reduces total calorie consumption without requiring calorie counting or restriction.
If you’re someone who eats a reasonable lunch and is somehow ravenous by 3pm, your protein intake at that meal is probably the first thing to look at.
Preserves and Builds Muscle As You Age
This one matters more as you get older. Sarcopenia is the medical term for age-related muscle loss, and it starts earlier than most people think. After 35, most adults lose between 3 and 5% of their muscle mass per decade without active intervention. That loss accelerates significantly after 60.
Eating enough protein, especially combined with resistance exercise, is the primary lever for slowing this process. Muscle isn’t just about how you look. It’s directly tied to metabolic health, glucose management, bone density, balance, and long-term independence.
Supports Fat Loss Without Losing Muscle
When you’re in a calorie deficit trying to lose weight, higher protein intake helps preserve lean muscle mass while your body burns fat. This matters because losing muscle alongside fat slows your metabolism and makes regaining weight much more likely.
Most research on protein and fat loss suggests that around 30% of total calories from protein is the sweet spot for preserving muscle during a deficit.
Burns More Calories During Digestion
Your body burns more calories digesting protein than it does digesting fat or carbohydrates. About 20 to 30% of the calories from protein are used in the digestion process itself, compared to around 5 to 10% for carbs and 0 to 3% for fat. It’s not a massive effect on its own, but it contributes meaningfully to your overall energy expenditure over time.
Best High-Protein Foods to Focus On
You don’t need to live on plain chicken breast to hit your protein targets. Here are some of the most useful sources:
Animal sources: Eggs (6g each), Greek yogurt (15 to 20g per cup), cottage cheese (25g per cup), chicken breast (35g per 4oz), canned tuna (25g per can), salmon (34g per 4oz)
Plant sources: Lentils (18g per cup cooked), edamame (17g per cup), tofu (15g per half cup), tempeh (31g per cup), black beans (15g per cup)
The practical challenge is simply getting enough at each meal rather than front-loading all your protein at dinner.
A Simple Daily Target
Aim for 30 to 40 grams of protein at each main meal. That’s roughly the size of your palm in animal protein, or a combination of plant sources adding up to the same. Hit that target three times a day and most active adults land in the optimal range without needing to track every gram.
Recommended Products
Thorne Creatine Monohydrate Powder pairs exceptionally well with a higher protein intake. While it’s not a protein supplement itself, creatine works synergistically with protein to support muscle growth, strength, and recovery. NSF Certified for Sport, clean ingredient list, and 5 grams of pure micronized creatine per serving. If you’re eating more protein and training consistently, creatine is the one add-on that has the most consistent evidence behind it.
Walking Pad is worth mentioning here because the benefits of higher protein intake multiply significantly when paired with consistent movement. Even low-intensity walking stimulates muscle protein synthesis and improves the way your body uses the protein you eat. If you’re eating more protein but staying sedentary, you’re leaving a lot of the benefit on the table.
Start with Breakfast
The easiest entry point for most people is fixing their breakfast first. A typical American breakfast of cereal, toast, or a muffin delivers maybe 5 to 8 grams of protein. Swapping to eggs, Greek yogurt, or a protein-rich smoothie can push that to 30 to 40 grams before you’ve left the house.
Make protein the first decision at every meal and the rest of your nutrition tends to fall into place around it. Give it two weeks and notice the difference in your energy, hunger levels, and how you feel after workouts.
Want more practical nutrition strategies? Check out our Thrive Blog.
This post is for informational purposes only and is not intended as medical advice. Talk to your doctor before making significant dietary changes, particularly if you have kidney disease, as high protein intake may not be appropriate for everyone.