Most adults need at least 0.36 grams of protein per pound of body weight per day, which works out to about 55 grams for a 150-pound person. That number, the official Recommended Dietary Allowance (RDA), represents the minimum to prevent deficiency. But newer guidelines and a growing body of research suggest most people benefit from eating more than that baseline, depending on their age, activity level, and goals.
The Baseline: How Much You Need at Minimum
The RDA for protein is 0.8 grams per kilogram of body weight, or 0.36 grams per pound. For a 150-pound adult, that’s roughly 54 grams. For someone weighing 180 pounds, it’s about 65 grams. This number was set to cover the needs of 97.5% of healthy, sedentary adults, meaning it’s designed to prevent muscle wasting and nutritional deficiency, not to optimize health or body composition.
The 2025–2030 Dietary Guidelines for Americans moved beyond that floor, suggesting adults eat between 1.2 and 1.6 grams per kilogram per day. For a 150-pound person, that translates to roughly 82 to 108 grams daily. This updated range reflects what most nutrition researchers now consider a more practical target for maintaining muscle, supporting metabolism, and staying healthy long-term.
Protein Needs by Activity Level
If you exercise regularly, especially if you do any form of strength training, your protein needs increase significantly. Sports nutrition experts generally recommend 1.6 to 2.2 grams per kilogram of body weight per day to maximize muscle growth and recovery. For a 170-pound person, that’s approximately 123 to 170 grams daily.
You don’t need to be a competitive athlete for this range to apply. Anyone doing consistent resistance training, whether that’s barbell work, bodyweight exercises, or even physically demanding manual labor, will recover faster and build more muscle at the higher end of protein intake. Endurance athletes like runners and cyclists also benefit from the upper end of this range, since prolonged cardio breaks down muscle tissue that needs to be repaired.
Why Older Adults Need More
After about age 50, your body becomes less efficient at using dietary protein to build and repair muscle. This gradual decline in muscle mass, called sarcopenia, accelerates with each decade and is a major contributor to falls, fractures, and loss of independence. A review published in The Journals of Gerontology found that older adults benefit from consuming 1.0 to 1.6 grams of protein per kilogram of body weight daily, well above the old RDA. For a 180-pound man, that’s roughly 82 to 130 grams per day.
Protein alone isn’t enough. Research consistently shows that combining higher protein intake with resistance exercise produces the biggest improvements in muscle mass and strength in older adults. Eating more protein without exercising helps, but the combination is far more effective.
Protein During Pregnancy
Pregnant women should aim for a minimum of 60 grams of protein per day, accounting for about 20% to 25% of total calories. Protein supports fetal tissue growth, placenta development, and the increase in blood volume that happens during pregnancy. Needs are highest in the second and third trimesters, when the baby is growing fastest.
Spreading Protein Across Meals Matters
Your body can only use so much protein at once for muscle repair. Research shows that roughly 30 grams of protein in a single meal is enough to maximally stimulate muscle building. Eating a larger portion, say 60 grams in one sitting, doesn’t double the muscle-building response. Beyond that threshold, the extra protein gets used for energy or other metabolic processes rather than muscle synthesis.
Studies looking at real-world eating patterns found that people who consumed 30 to 45 grams of protein per meal, spread across three or more meals, had greater leg muscle mass and strength than those who loaded most of their protein into a single meal. The practical takeaway: if your daily target is 100 grams, you’ll get more benefit from three meals with 30-plus grams each than from a small breakfast and a massive dinner.
Not All Protein Sources Are Equal
Animal proteins (meat, fish, eggs, dairy) contain all the essential amino acids your body needs and are more easily digested than most plant proteins. Research comparing plant-based and animal-based foods found that animal sources consistently score higher on digestibility metrics, meaning your body absorbs and uses a larger percentage of the protein you eat.
That doesn’t mean plant-based diets can’t meet your needs. Soy, quinoa, and buckwheat are complete plant proteins. Other plant sources like beans, lentils, nuts, and whole grains can provide all essential amino acids when you eat a variety throughout the day. If you eat entirely plant-based, aiming for the higher end of protein recommendations helps compensate for the slightly lower digestibility.
Can You Eat Too Much Protein?
For most healthy people, intakes up to about 1.6 grams per kilogram are well-supported and safe. Going higher, into the 2.0 grams per kilogram range and above, is where caution becomes warranted. Some research has linked very high protein intakes to increased risk of chronic disease over time, though the evidence is mixed and often complicated by what else people are eating alongside the protein.
The clearest risk involves your kidneys. Digesting protein produces waste products that your kidneys filter out, so eating large amounts creates more work for them. For people with healthy kidneys, this extra workload is generally manageable. But if you have any degree of kidney disease, even early-stage, high protein intake can accelerate damage. As a rough ceiling, keeping intake below about 0.9 grams per pound of body weight (around 150 grams for a 165-pound person) avoids the territory where risks start to outweigh benefits for most people.
A Quick Reference by Body Weight
- 130 pounds (59 kg): Minimum 47g, general health 71–94g, active/athletic 94–130g
- 150 pounds (68 kg): Minimum 54g, general health 82–108g, active/athletic 109–150g
- 180 pounds (82 kg): Minimum 65g, general health 98–131g, active/athletic 131–180g
- 200 pounds (91 kg): Minimum 72g, general health 109–145g, active/athletic 145–200g
The “general health” column reflects the updated dietary guidelines of 1.2 to 1.6 grams per kilogram. The “active/athletic” column uses the 1.6 to 2.2 grams per kilogram range supported by sports nutrition research. Your ideal number depends on your goals: maintaining general health, losing weight while preserving muscle, or actively building strength.