Protein is the nutrient most worth paying attention to when you are eating less. It helps you feel full, and it helps your body hold on to muscle while you lose fat. Here is how much research suggests, how to spread it out, and what that looks like on a plate.
Key takeaways
- The RDA for adults is 0.8 grams of protein per kilogram of body weight a day. That is a minimum for health, not a weight-loss target.
- Studies on weight loss often use about 1.0–1.6 g per kg a day, especially for older adults and people who strength train.
- Aim for roughly 20–30 grams of protein at each meal instead of saving most for dinner.
- Pair protein with strength training. Protein alone does not build or keep muscle.
- People with kidney disease should follow their clinician’s protein advice.
The short answer
To find your weight in kilograms, divide pounds by 2.2. Then:
| Situation | Grams per kg per day | Example: 170 lb (77 kg) |
|---|---|---|
| Baseline adult need (RDA) | 0.8 | about 62 g |
| Losing weight, light activity | 1.0–1.2 | about 77–93 g |
| Losing weight with strength training, or age 65+ | 1.2–1.6 | about 93–123 g |
Use our protein calculator to get your own range and a per-meal target. If you have a lot of weight to lose, some dietitians base the calculation on a goal or adjusted body weight instead of current weight; ask yours which they prefer.
Why protein matters more when you eat less
Fullness. Research reviews have found that higher-protein diets tend to improve satiety and help people control their appetite during a calorie deficit.
Muscle. When you lose weight, some of what you lose is lean tissue. Eating more protein, especially together with resistance exercise, helps limit that loss. That matters for strength, balance and everyday function, particularly as we age. A review focused on older adults concluded that intakes above the RDA, at least 1.0–1.2 g per kg, are advisable during weight loss.
Energy cost. Your body uses a bit more energy to digest protein than carbohydrate or fat. It is a small effect, not a magic trick.
Spread it across the day
Many people eat little protein at breakfast and most of it at dinner. A more even split, roughly 20–30 grams per meal, is a practical target that research on muscle supports. Breakfast is usually the easiest place to gain; see our list of high-protein breakfast ideas.
What 25 grams of protein looks like
Approximate values based on USDA FoodData Central; always check labels, which vary by brand.
- About 3–4 oz cooked chicken breast, turkey, fish or lean beef
- 1 cup of low-fat cottage cheese
- 1 to 1½ cups (8–12 oz) of plain Greek yogurt, depending on the brand
- 3 large eggs plus ½ cup of egg whites
- About 1 cup of firm tofu, or 1½ cups of lentils or beans (beans also bring a lot of fiber)
- Most scoops of protein powder provide 20–25 g (check the label)
Plant-based? You can still get there
Tofu, tempeh, edamame, lentils, beans, seitan, soy milk and pea-protein products make plant-based targets very achievable. Combining a few sources over the day covers the amino acids you need.
Who should be careful
If you have chronic kidney disease, your clinician may recommend limiting protein, so follow their target. If you are on a GLP-1 medication and eating very little, protein becomes even more important; see what to eat on a GLP-1.
Frequently asked questions
Can you eat too much protein?
For healthy adults, intakes in the ranges above are generally considered safe. Very high intakes can crowd out fiber-rich foods. People with kidney disease need individual advice.
Do I need protein shakes to lose weight?
No. Shakes are a convenience. Whole foods work just as well and bring other nutrients. A shake can help on busy mornings or when your appetite is low.
How much protein should a woman eat to lose weight?
The same per-kilogram ranges apply. For example, a 150-pound woman (about 68 kg) aiming for 1.0–1.2 g per kg would eat about 68–82 grams a day, or about 23–27 grams per meal across three meals.
Sources
- Leidy HJ et al. The role of protein in weight loss and maintenance. Am J Clin Nutr, 2015
- Al-Nimr RI, Batsis JA. Protein needs during weight loss in older adults (review, 2018)
- Dietary Guidelines for Americans (USDA/HHS)
- USDA FoodData Central
- Jensen MD et al. 2013 AHA/ACC/TOS Guideline for the Management of Overweight and Obesity in Adults. Circulation, 2014