Most people trying to lose weight need between 1.2 and 1.6 grams of protein per kilogram of body weight each day, which works out to roughly 0.55 to 0.73 grams per pound. For a 170-pound person, that’s about 93 to 124 grams of protein daily. The exact number depends on your activity level, how much weight you’re losing, and your body composition.
How to Calculate Your Protein Target
The simplest method is to multiply your body weight in pounds by a factor based on your activity level:
- Sedentary, moderate calorie deficit: 0.55–0.7 g per pound of body weight
- Active, regular strength training: 0.7–0.9 g per pound of body weight
- Very active, aggressive calorie deficit: 0.9–1.0 g per pound of body weight
So a 200-pound person who exercises a few times per week would aim for 140 to 180 grams per day. A 150-pound person doing light activity would target around 83 to 105 grams.
The baseline recommendation for all adults is 0.8 grams per kilogram (about 0.36 grams per pound), but that number represents the minimum to avoid deficiency, not the amount that helps with fat loss. Research on body composition consistently points to a range of 1.6 to 2.2 grams per kilogram as the sweet spot for preserving lean tissue while losing fat, with the lower end of that range being sufficient for most people.
Should You Use Total Weight or Lean Body Mass?
If you’re within a normal weight range, using your total body weight in the formulas above works fine. The question gets trickier at higher body fat percentages because fat tissue doesn’t require protein the way muscle does, and calculating off a very high body weight can produce unrealistically large numbers.
There’s no direct evidence that people with obesity need a different per-kilogram protein target for muscle maintenance. But practically, if your body weight is well above a healthy range, try using your goal weight or an adjusted body weight instead. For example, a 280-pound person aiming for 200 pounds might calculate protein needs based on something closer to 220 or 230 pounds, landing around 120 to 160 grams daily rather than an unwieldy 200-plus grams.
Why Protein Matters More During Weight Loss
When you eat fewer calories than you burn, your body pulls energy from both fat stores and muscle tissue. Higher protein intake shifts that ratio heavily toward fat loss while sparing muscle. This matters because muscle is metabolically active tissue. Losing it slows your metabolism and makes it harder to keep weight off long-term.
Protein also burns more calories during digestion than any other macronutrient. Your body uses 15 to 30 percent of protein calories just to break it down and absorb it, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fat. That means 100 calories of chicken breast costs your body 15 to 30 calories to process, while 100 calories of butter costs almost nothing. Over the course of a day, this adds up.
How Protein Controls Hunger
The biggest practical advantage of higher protein intake during a calorie deficit is that it makes you less hungry. Protein triggers stronger release of satiety hormones from your gut than carbohydrates do. One of the key players is a hormone released from cells in your lower intestine after you eat. This hormone travels to the brain’s appetite control center and quiets the neurons that drive hunger while activating the ones that signal fullness. Protein appears to be a stronger trigger for this response than either carbs or fat.
This isn’t a subtle effect. People consistently report feeling more satisfied after high-protein meals, and studies show they eat less at subsequent meals without consciously trying to. If you’ve ever noticed that a breakfast of eggs keeps you full until lunch while a bagel has you snacking by 10 a.m., you’ve experienced this firsthand.
Spreading Protein Across the Day
Your body can only use so much protein at once for muscle repair and maintenance. Research suggests that 20 to 25 grams of protein per meal is the threshold to maximally stimulate muscle rebuilding in younger adults, with older adults likely needing slightly more per sitting. The practical recommendation is to spread your daily target evenly across four meals, aiming for roughly 0.4 to 0.55 grams per kilogram of body weight at each one.
For a 170-pound person targeting 120 grams daily, that means about 30 grams at each of four meals. A chicken breast has roughly 30 grams. A cup of Greek yogurt has about 15 to 20. Two eggs provide around 12. Planning meals around a protein anchor and building the rest of your plate from there is the simplest strategy.
Not All Protein Sources Are Equal
Protein quality varies by how well your body can digest and use the amino acids in a food. Animal sources like eggs, dairy, meat, and fish score highest on digestibility measures. Whole milk protein, for instance, scores over 100 on the international scale used to rate protein quality, while wheat scores around 40 and peas land near 64.
This doesn’t mean plant proteins are useless. It means you may need slightly more total protein if plants are your primary source, and combining different plant proteins (grains with legumes, for example) helps fill in the amino acid gaps. If you eat a mix of animal and plant sources, you don’t need to worry about this at all.
Upper Limits to Keep in Mind
For healthy adults with normal kidney function, protein intake up to about 2 grams per kilogram of body weight (roughly 0.9 grams per pound) is considered safe. For a 140-pound person, that ceiling is around 125 grams per day. Going beyond that doesn’t appear to offer additional fat-loss benefits for most people, and it can crowd out other nutrients your body needs.
Older adults may actually benefit from pushing toward the higher end of the recommended range. A 2023 review suggested that adults over 60 may need 1.0 to 1.6 grams per kilogram daily to maintain muscle strength, which is especially important when combining calorie restriction with aging, two factors that both accelerate muscle loss on their own.
Putting the Numbers Together
Here’s a quick reference for common body weights, using the moderate range of 0.7 grams per pound:
- 130 lbs: ~91 g protein per day
- 150 lbs: ~105 g protein per day
- 170 lbs: ~119 g protein per day
- 190 lbs: ~133 g protein per day
- 210 lbs: ~147 g protein per day
If you strength train regularly or are in an aggressive deficit (losing more than a pound per week), move toward 0.9 grams per pound. If you’re lightly active and losing weight slowly, 0.55 to 0.7 grams per pound is a reasonable starting point. Track your intake for a week or two to see where you currently land, then adjust upward if you’re falling short. Most people are surprised to find they’re eating far less protein than they think.