To lose weight while preserving muscle, most people need between 1.0 and 1.2 grams of protein per kilogram of body weight each day. That’s roughly 0.45 to 0.55 grams per pound. For a 170-pound person, that works out to about 77 to 94 grams of protein daily. The exact number depends on your weight, activity level, and how aggressively you’re cutting calories.
A Simple Way to Calculate Your Target
You don’t need a fancy calculator. Here’s the math:
- Step 1: Convert your weight to kilograms by dividing your weight in pounds by 2.2.
- Step 2: Multiply that number by 1.0 for a baseline target, or by 1.2 if you’re active or eating in a larger calorie deficit.
For example, if you weigh 200 pounds: 200 ÷ 2.2 = 91 kg. At 1.0 g/kg, your target is 91 grams. At 1.2 g/kg, it’s about 109 grams. If you exercise regularly, especially with resistance training, you may benefit from going higher, up to 1.6 g/kg (145 grams in this example), which is the lower end of what sports nutrition research supports for people trying to retain lean mass during a deficit.
These numbers are well above the general recommended daily allowance of 0.8 g/kg, which is designed to prevent deficiency in sedentary adults, not to support weight loss. The gap between that baseline and the 1.0 to 1.2 g/kg range for fat loss is significant, and it’s one reason many people eating “enough” protein still lose muscle when they diet.
Why Protein Matters More During Weight Loss
When you eat fewer calories than you burn, your body doesn’t just pull from fat stores. It also breaks down muscle tissue for energy. Protein intake is the single biggest dietary lever you have to slow that process. Higher protein diets during a calorie deficit consistently outperform standard protein diets: a meta-analysis in The American Journal of Clinical Nutrition found that high-protein dieters lost nearly an extra kilogram of fat mass compared to those eating standard amounts, even when total calories were the same.
Protein also has a meaningful edge in how your body processes it. Your body burns 15 to 30% of the calories from protein just digesting and absorbing it. Compare that to 5 to 10% for carbohydrates and 0 to 3% for fats. So 100 calories of chicken breast costs your body significantly more energy to process than 100 calories of bread or butter. Over weeks and months, this adds up.
Then there’s hunger. Protein triggers the release of gut hormones that signal fullness to your brain. These hormones rise after any meal, but protein-rich meals produce a sustained response that peaks about two hours after eating. In practical terms, a breakfast with 30 grams of protein keeps you satisfied far longer than a same-calorie breakfast built around toast and fruit. When you’re in a calorie deficit and fighting hunger daily, this effect is genuinely useful.
How to Spread Protein Across the Day
Your body can only use so much protein at once for maintaining and building muscle tissue. Research suggests that 20 to 25 grams per meal is the threshold for younger adults, while older adults may need slightly more per sitting. The practical recommendation: spread your daily protein target evenly across four meals, aiming for roughly 0.4 to 0.55 grams per kilogram at each one.
For the 200-pound person targeting 109 grams daily, that’s about 27 grams per meal across four eating occasions. This doesn’t need to be precise. The point is to avoid the common pattern of eating almost no protein at breakfast and lunch, then loading 70 grams into dinner. That backloaded approach doesn’t give your body consistent access to the amino acids it needs to protect muscle throughout the day.
Adjusting for Activity Level
The 1.0 to 1.2 g/kg range works well for people who are moderately active or primarily doing cardio while losing weight. If you’re doing regular resistance training (lifting weights two or more times per week), your protein needs are higher. Research on athletes cutting weight suggests 1.6 to 2.4 g/kg per day to maximize muscle retention, with diminishing returns above 2.4 g/kg.
You don’t need to be an elite athlete to benefit from the higher end. Anyone consistently strength training while in a calorie deficit is placing significant demands on their muscles, and the protein needed to support recovery and prevent breakdown goes up accordingly. A reasonable middle ground for active recreational lifters is 1.4 to 1.6 g/kg, which for a 170-pound person means roughly 108 to 124 grams daily.
Quick Reference by Body Weight
Here’s what the ranges look like for common body weights, covering the general weight-loss range (1.0 to 1.2 g/kg) and the active/lifting range (1.4 to 1.6 g/kg):
- 140 lbs (64 kg): 64–77 g (general) or 90–102 g (active)
- 160 lbs (73 kg): 73–87 g (general) or 102–116 g (active)
- 180 lbs (82 kg): 82–98 g (general) or 115–131 g (active)
- 200 lbs (91 kg): 91–109 g (general) or 127–145 g (active)
- 220 lbs (100 kg): 100–120 g (general) or 140–160 g (active)
- 250 lbs (114 kg): 114–136 g (general) or 159–182 g (active)
If you’re significantly overweight, using your current body weight can overestimate your needs. In that case, you can base the calculation on your goal weight instead, or use a rough estimate of your lean body mass if you know your body fat percentage.
Is Too Much Protein a Problem?
For healthy adults, eating in the ranges above poses no established risk to kidney function. The concern about protein damaging kidneys applies specifically to people who already have kidney disease, where the extra workload of processing protein waste products can accelerate decline.
The more realistic risks of very high protein diets come from what you’re eating alongside the protein. Diets built heavily around red and processed meats can raise LDL cholesterol and heart disease risk. Extremely restrictive high-protein approaches that cut carbohydrates too aggressively can leave you low on fiber, causing constipation and other digestive issues. These are problems with food choices and diet balance, not with protein itself.
A reasonable upper limit for most people pursuing weight loss is around 2.2 g/kg per day. Beyond that, research shows minimal additional benefit for muscle preservation, and you’re using a large share of your calorie budget on protein alone, leaving less room for the fats, carbohydrates, fruits, and vegetables that round out a sustainable diet.
Putting the Numbers Into Practice
Hitting a protein target of 80 to 120 grams daily is easier than it sounds once you build meals around a protein source first. A palm-sized portion of chicken, fish, or lean meat provides roughly 25 to 30 grams. A cup of Greek yogurt has about 15 to 20 grams. Two eggs give you 12 grams. A scoop of protein powder adds 20 to 25 grams if whole foods fall short.
The most common mistake people make when trying to increase protein for weight loss isn’t choosing the wrong foods. It’s front-loading nothing and back-loading everything. Start each meal planning session by asking: where’s my 25 grams of protein coming from? Once you answer that question four times a day, the rest of your diet fills in around it naturally.