Eating more protein is one of the most effective dietary changes you can make during weight loss, and the target most supported by research is about 1.6 grams per kilogram of body weight per day (roughly 0.73 grams per pound). For a 170-pound person, that works out to about 124 grams of protein daily. At that level, you burn more calories digesting your food, stay fuller between meals, and protect the muscle mass that keeps your metabolism running.
How Much Protein You Actually Need
The general dietary recommendation for protein is 0.8 grams per kilogram of body weight, but that number is designed to prevent deficiency, not to support weight loss. When you’re eating fewer calories than you burn, your body doesn’t just tap fat for energy. It also breaks down muscle. Higher protein intake counteracts that.
A study comparing low protein intake (1.0 g/kg per day) to high protein intake (2.3 g/kg per day) during a caloric deficit found a stark difference: the low-protein group lost about 3.5 pounds of muscle, while the high-protein group lost less than a pound. Another study tested three levels (0.8, 1.6, and 2.4 g/kg per day) and found that 1.6 g/kg preserved significantly more muscle than 0.8, but going up to 2.4 offered no additional benefit. That 1.6 g/kg sweet spot is where the returns plateau for most people.
To find your number, multiply your weight in pounds by 0.73. If you weigh 150 pounds, aim for roughly 110 grams of protein per day. If you weigh 200 pounds, that’s about 146 grams.
Why Protein Helps With Weight Loss
Protein works through several mechanisms at once, which is why it outperforms simple calorie counting on its own.
The most measurable effect is the thermic effect of food. Your body uses energy to digest everything you eat, but protein costs far more to process than other nutrients. Digesting protein burns 15 to 30 percent of its calories, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fat. If you eat 500 calories of protein, your body may spend 75 to 150 of those calories just breaking it down. That adds up over the course of a day.
Protein also keeps you full longer. It slows stomach emptying and triggers the release of gut hormones that signal satiety to your brain. The practical result is that high-protein meals reduce the urge to snack and make it easier to stick to a caloric deficit without feeling deprived. Many people who increase their protein find they naturally eat less at the next meal without consciously trying.
Spread It Across Your Meals
Your body can only use so much protein at once for muscle maintenance. Research shows that triggering muscle protein synthesis requires a meal with roughly 30 to 35 grams of high-quality protein, which provides about 2.5 to 3 grams of the amino acid leucine. Eating 90 grams of protein at dinner and 10 grams at breakfast is far less effective than splitting your intake more evenly.
If your daily target is 120 grams, aim for three meals with 30 to 40 grams each, or three meals plus a protein-rich snack. This keeps your body in a muscle-preserving state throughout the day rather than cycling between deficiency and excess. For adults over 60, hitting that 30-gram-per-meal threshold becomes even more important, as aging muscles need a stronger signal to maintain themselves.
Best High-Protein Foods for a Calorie Deficit
When you’re trying to lose weight, the protein-to-calorie ratio of your food matters. Some protein sources pack a lot of calories from fat, which can eat into your deficit quickly. The most efficient options deliver the most protein per calorie.
Among animal proteins, these stand out:
- Cod (baked): 19 grams of protein in just 89 calories per 3-ounce serving
- Chicken breast (skinless): 18 grams of protein for 101 calories per 3 ounces
- Turkey breast (skinless): 34 grams of protein for 153 calories per 4 ounces
- Lean beef round: 25 grams of protein for 138 calories per 3 ounces
- Pork tenderloin: 24 grams of protein for 139 calories per 3 ounces
- Shrimp: about 6 grams of protein for only 28 calories per ounce
- Tuna canned in water: 10 grams of protein for 45 calories per quarter cup
For dairy and eggs, low-fat cottage cheese delivers about 4 grams of protein per ounce at only 26 calories. Nonfat Greek yogurt provides 15 to 17 grams per 6-ounce serving. Egg whites are extremely lean at 3.6 grams of protein and just 16 calories each, though whole eggs are still a good choice if you have the calorie room since the yolk adds healthy fats and micronutrients.
Deli meats like sliced chicken or roast beef offer a convenient option at about 5 grams of protein and 20 to 29 calories per slice, making them easy to add to salads, wraps, or snacks when you need a quick protein boost.
Using Protein Supplements Strategically
Whole foods should make up most of your protein intake, but supplements can fill gaps when cooking isn’t practical. The two most common options, whey and casein, behave differently in your body.
Whey protein is absorbed quickly, with amino acids hitting your bloodstream within about 20 minutes. This makes it useful around workouts or as a fast breakfast option. Casein digests much more slowly, with amino acid levels peaking 3 to 4 hours after consumption. That slow release makes casein particularly useful before bed or during long stretches between meals, as it keeps you full longer and protects muscle while you sleep.
A scoop of either type typically provides 20 to 30 grams of protein for 100 to 150 calories. Mixed into water or blended with fruit, a protein shake can turn a low-protein snack into a complete one. If you struggle to hit your daily target through food alone, one shake a day can close the gap without adding much complexity to your routine.
Practical Ways to Add More Protein
Most people eat the majority of their protein at dinner, which means breakfast and lunch are the easiest places to make changes. Swapping a bowl of cereal for eggs or Greek yogurt can add 15 to 20 grams of protein to your morning without much effort. Adding a can of tuna or deli chicken to a lunchtime salad transforms it from a low-protein side into a real meal.
Snacking is another opportunity. Instead of crackers or fruit on their own, pair them with cottage cheese, jerky, or a hard-boiled egg. These combinations slow digestion and carry you further to the next meal. Prepping protein in bulk on weekends (grilling several chicken breasts, cooking a batch of lean ground turkey, hard-boiling a dozen eggs) eliminates the daily friction that causes most people to default to lower-protein convenience foods.
If you eat plant-based, combining legumes, tofu, tempeh, and seitan across your meals can get you to the same targets, though it generally requires more volume of food. Adding a plant-based protein powder can help bridge the difference.
Is High Protein Safe?
For healthy adults, high-protein diets are not known to cause medical problems. The longstanding concern about kidney damage comes from studies on people who already have kidney disease, where the kidneys struggle to clear protein’s waste products. If you have existing kidney issues, a higher protein intake can worsen function. But for people with healthy kidneys, intakes in the 1.6 g/kg range are well within the range that research supports as safe.
Staying well hydrated is still a good idea when eating more protein, as your kidneys do process more nitrogen-containing waste. Drinking enough water throughout the day supports that process and helps with the general fatigue that can accompany a caloric deficit.