Most people trying to lose weight benefit from eating 1.2 to 1.6 grams of protein per kilogram of body weight per day. For a 170-pound person, that works out to roughly 90 to 120 grams of protein daily. That range, recently endorsed in the 2025–2030 Dietary Guidelines for Americans, is 50 to 100 percent higher than the old baseline recommendation of 0.8 grams per kilogram, which was designed to prevent deficiency rather than optimize body composition.
Why Protein Matters More During Weight Loss
When you eat fewer calories than you burn, your body doesn’t just pull energy from fat. It also breaks down muscle tissue for fuel. Losing muscle slows your metabolism, making it harder to keep weight off long-term. Protein counteracts this in three ways that directly support fat loss.
First, protein keeps you full longer. It triggers your gut to release hormones that signal satiety while suppressing the hunger hormone ghrelin. Clinical trials comparing high-protein diets to standard-protein diets consistently find that people on higher protein report feeling more full and less hungry between meals, which makes it easier to stick with a calorie deficit without white-knuckling it.
Second, protein burns more calories just being digested. Your body uses about 23 percent of the calories in protein simply to break it down, absorb it, and process it. Compare that to roughly 6 percent for carbohydrates and 3 percent for fat. If you eat 400 calories of protein, about 92 of those calories go toward digestion itself. That thermogenic advantage adds up over weeks and months.
Third, and most importantly for how you’ll look and feel at the end, adequate protein preserves lean muscle mass during a calorie deficit. Muscle is metabolically active tissue. Keeping it means your resting metabolism stays higher, you maintain strength, and the weight you lose comes predominantly from fat rather than a mix of fat and muscle.
How to Calculate Your Target
Your ideal protein intake depends on your body weight and how active you are. Here’s how the ranges break down:
- Sedentary or lightly active: 1.2 to 1.5 grams per kilogram of body weight (0.55 to 0.68 grams per pound)
- Regular exerciser (cardio, group fitness, recreational sports): 1.1 to 1.5 grams per kilogram (0.5 to 0.68 grams per pound)
- Strength training or endurance training: 1.2 to 1.7 grams per kilogram (0.55 to 0.77 grams per pound)
If you’re doing resistance training while in a calorie deficit, which is one of the most effective strategies for changing your body composition, some guidelines push as high as 0.7 to 1.0 grams per pound of body weight. That upper range is specifically aimed at preserving muscle when calories are restricted.
To put this in real numbers: a 150-pound person who exercises regularly would aim for about 82 to 102 grams of protein per day. A 200-pound person doing strength training might target 110 to 150 grams. Intake above 2 grams per kilogram (0.9 grams per pound) is generally considered excessive and unlikely to provide additional benefit for most people.
Spreading Protein Across Meals
Eating all your protein in one or two meals is less effective than distributing it throughout the day. Your body can only ramp up muscle-building processes so much at once. Research shows that each meal needs roughly 30 to 35 grams of high-quality protein to fully activate muscle repair and growth. That activation stays elevated for about two and a half hours after eating before tapering off.
A practical approach: aim for three to four meals per day, each containing 25 to 40 grams of protein. If your daily target is 120 grams, that might look like 30 grams at breakfast, 30 at lunch, 30 at dinner, and a 30-gram snack. This pattern keeps your body in a muscle-preserving state throughout the day rather than cycling between protein surplus and deficit. For older adults especially (over 60), hitting at least 30 grams per meal becomes more important because the threshold needed to trigger muscle repair rises with age.
What Counts as High-Quality Protein
Not all protein sources are equally effective at preserving muscle. The key factor is leucine, an amino acid that acts as the on-switch for muscle repair. You need about 2.5 grams of leucine per meal to flip that switch, which is roughly what you get in 30 grams of protein from animal sources like chicken, fish, eggs, or dairy. Plant proteins generally contain less leucine per gram, so you may need larger servings or strategic combinations to hit the same threshold.
A few examples of what 30 grams of protein looks like: about 4 ounces of chicken breast, 5 ounces of salmon, one cup of Greek yogurt plus two eggs, or one and a half cups of lentils. If you’re relying heavily on plant sources, combining legumes with grains or adding a protein-rich food like tofu, tempeh, or edamame at each meal helps close the leucine gap.
Protein Alone Won’t Drive Weight Loss
Higher protein intake supports weight loss, but it doesn’t override calories. Excess protein beyond what your body uses for muscle repair and other functions can still be converted to fat. The fundamental requirement for losing weight remains eating fewer calories than you burn. Protein makes that easier by keeping you satisfied and preserving muscle, but it’s a tool within a calorie deficit, not a replacement for one.
Where people sometimes go wrong is adding protein on top of everything else they’re already eating. Swapping lower-protein foods for higher-protein options at the same meal is more effective than simply layering on extra calories from protein shakes or bars. Think replacement, not addition.
Safety at Higher Intakes
For healthy adults, high-protein diets are not known to cause medical problems. The longstanding concern about protein damaging kidneys applies specifically to people who already have kidney disease, because compromised kidneys struggle to clear protein’s waste products. If you have kidney disease, diabetes, or other chronic conditions, work out your protein targets with a healthcare provider. For everyone else, intakes in the 1.2 to 1.7 grams per kilogram range are well within the bounds that research supports as safe.