Most people trying to lose weight benefit from eating 1.2 to 1.6 grams of protein per kilogram of body weight per day, which works out to roughly 0.5 to 0.7 grams per pound. For a 170-pound person, that’s approximately 85 to 120 grams of protein daily. This range is well above the baseline recommendation of 0.8 grams per kilogram (designed just to prevent deficiency) and high enough to preserve muscle, control hunger, and give your metabolism a modest boost while you’re in a calorie deficit.
The exact number depends on how active you are, how much weight you have to lose, and whether you’re strength training. Here’s how to find your target and why it matters.
Why Protein Helps With Weight Loss
Protein supports weight loss through three overlapping mechanisms, and understanding them helps explain why simply cutting calories without paying attention to protein often backfires.
First, protein is the most metabolically expensive nutrient to digest. Your body burns 15 to 30 percent of protein calories just breaking them down and absorbing them, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fat. If you eat 400 calories of chicken breast, your body spends 60 to 120 of those calories on digestion alone. This is called the thermic effect of food, and it means higher-protein diets slightly increase total calorie burn without any extra exercise.
Second, protein is the most satiating macronutrient. It lowers levels of ghrelin, the hormone that drives hunger, while raising levels of several hormones that signal fullness. The practical result: you feel satisfied sooner during meals and stay full longer between them. Over the course of a day, this often leads to eating fewer total calories without consciously trying to restrict.
Third, and arguably most important during a calorie deficit, protein protects your lean muscle mass. When you eat fewer calories than you burn, your body doesn’t just pull energy from fat stores. It also breaks down muscle. Losing muscle slows your resting metabolism, making it progressively harder to keep losing weight and easier to regain it. Adequate protein intake significantly reduces this muscle loss.
How Much Protein You Actually Need
The standard Recommended Dietary Allowance of 0.8 grams per kilogram of body weight (about 0.36 grams per pound) is a minimum to prevent deficiency in sedentary adults. It is not optimized for weight loss or body composition.
For weight loss, the research points to a range that depends on your activity level:
- Sedentary or lightly active: 1.0 to 1.2 grams per kilogram (0.45 to 0.55 grams per pound). This is enough to improve satiety and provide a metabolic edge over lower-protein diets.
- Regular exercisers: 1.2 to 1.5 grams per kilogram (0.55 to 0.7 grams per pound). If you walk frequently, do group fitness classes, or run, this range helps preserve muscle during a deficit.
- Strength training or high-intensity exercise: 1.2 to 1.7 grams per kilogram (0.55 to 0.77 grams per pound). People lifting weights regularly need the upper end to protect muscle and support recovery.
Some weight loss guidelines go even higher, recommending up to 0.7 to 1.0 grams per pound of body weight specifically for muscle preservation during a deficit. That upper range is most relevant if you’re combining aggressive calorie restriction with serious resistance training. For most people, landing somewhere in the middle of these ranges, around 100 to 130 grams per day for someone weighing 150 to 180 pounds, is both effective and sustainable.
How to Calculate Your Personal Target
The simplest approach: multiply your body weight in pounds by 0.6 to 0.7. A 160-pound person would aim for 96 to 112 grams per day. If you’re significantly overweight, using your goal weight or an adjusted body weight gives a more practical number, since fat tissue doesn’t require the same protein support that muscle does. A 250-pound person aiming for 180 pounds might calculate based on 200 pounds as a midpoint, landing around 120 to 140 grams daily.
You don’t need to hit an exact number every single day. Consistency over the week matters more than perfection at each meal. That said, spreading your protein across three or four meals rather than loading it all into dinner tends to work better for both appetite control and muscle maintenance. Aiming for 25 to 40 grams per meal is a reasonable starting point for most people.
What the Weight Loss Data Shows
A meta-analysis of randomized controlled trials published in The American Journal of Clinical Nutrition compared high-protein diets (25 to 35 percent of total calories) against standard-protein diets (12 to 18 percent of total calories) during calorie restriction. The high-protein groups lost about 0.8 kilograms (roughly 1.7 pounds) more body weight on average and nearly a full kilogram more fat mass. Just as importantly, the high-protein groups retained about 0.43 kilograms more lean mass.
Those differences might sound small, but they compound over months, and the lean mass preservation is significant for long-term metabolism. Losing 10 pounds where 8 of those pounds are fat is a fundamentally different outcome than losing 10 pounds where 5 are fat and 5 are muscle, even though the scale reads the same.
It’s worth noting that the most recent clinical guidelines from the American Association of Clinical Endocrinology, updated in 2025, don’t endorse any single macronutrient ratio as universally superior. The best dietary pattern is the one you can stick with long-term. But within that framework, the guidelines specifically recommend prioritizing lean protein as a core part of a weight loss diet.
Protein Sources That Make It Practical
Reaching 100-plus grams of protein per day is easier than it sounds once you build meals around protein-rich foods rather than adding protein as an afterthought. A palm-sized portion of chicken, fish, or lean beef provides roughly 25 to 30 grams. Two eggs give you about 12 grams. A cup of Greek yogurt has 15 to 20 grams. A cup of cooked lentils provides around 18 grams.
A practical day might look like: eggs and Greek yogurt at breakfast (30 grams), a chicken or tuna salad at lunch (35 grams), a handful of almonds as a snack (6 grams), and a piece of salmon with beans at dinner (40 grams). That’s over 110 grams without any supplements. Protein shakes or bars can fill gaps on busy days, but whole foods are more satiating per calorie, which matters when you’re eating in a deficit.
If you eat a plant-based diet, you may need to aim slightly higher, around 1.0 to 1.2 grams per kilogram, because plant proteins are generally less digestible and lower in certain essential amino acids than animal sources. Combining different sources throughout the day (beans with grains, tofu with nuts, lentils with seeds) addresses this effectively.
Safety at Higher Intakes
High-protein diets do not cause kidney problems in people with healthy kidneys. This is one of the most persistent nutrition myths, but clinical evidence does not support it. However, if you already have kidney disease, a high-protein diet can worsen kidney function because your body may struggle to clear the waste products from protein metabolism. If you have existing kidney issues, work with your doctor before increasing protein significantly.
Intakes above 2 grams per kilogram of body weight per day are generally considered excessive for most people and offer no additional weight loss or muscle-building benefit. Staying in the 1.2 to 1.7 grams per kilogram range keeps you in the well-studied, effective zone without any meaningful health risk.