Can you lose weight eating high protein? Yes. Research shows that eating more protein helps you burn fat, keep muscle and feel full longer. A meta-analysis of over 1,000 people found that high protein diets led to 0.87 kg more fat loss than normal protein diets, and people actually gained 0.43 kg of lean muscle at the same time.
This article breaks down exactly how protein helps you lose weight, how much you need and what foods work best.
Does Eating More Protein Actually Help You Lose Weight?
Yes. Protein helps you lose weight in three main ways.
First, protein burns more calories during digestion. Your body uses about 20 to 30 percent of protein calories just to digest and process it. Compare that to carbs at 5 to 10 percent and fat at 0 to 3 percent. A high protein meal compared to a high carb or high fat meal increases the thermic effect by about 17 percent.
Second, protein keeps you full. A meta-analysis of 49 studies found that protein decreased hunger, reduced the desire to eat and increased fullness. It also lowered ghrelin (the hunger hormone) by 20 pg/ml and increased the satiety hormones CCK and GLP-1.
Third, protein protects your muscle. When you cut calories to lose fat, your body wants to break down both fat and muscle. A study found that people eating 1.0 g protein per kg of bodyweight lost 1.6 kg of muscle. People eating 2.3 g per kg lost only 0.3 kg of muscle.
How Much Protein Do You Need To Lose Weight?
Aim for 1.6 to 2.4 grams of protein per kilogram of bodyweight each day for weight loss.
Here is a quick guide based on your weight:
- 60 kg person = 96 to 144 grams of protein per day
- 70 kg person = 112 to 168 grams of protein per day
- 80 kg person = 128 to 192 grams of protein per day
- 90 kg person = 144 to 216 grams of protein per day
- 100 kg person = 160 to 240 grams of protein per day
The standard recommended daily allowance is only 0.8 g per kg. This keeps you from getting sick but it is not enough for weight loss or keeping muscle.
Research from a 2024 systematic review of 47 studies found that eating more than 1.3 g per kg per day prevented muscle loss during weight loss. Below 1.0 g per kg per day led to muscle decline.
If you exercise and lift weights, go toward the higher end at 2.0 to 2.4 g per kg. A study of young men who trained hard while eating 40 percent fewer calories found that the group eating 2.4 g protein per kg gained 1.2 kg of muscle while the group eating 1.2 g per kg only maintained theirs.
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Download FreeWhat Happens When You Eat Protein On A Diet?
When you eat protein during a calorie deficit, your body:
- Burns more calories through digestion
- Releases more fullness hormones like PYY and GLP-1
- Suppresses ghrelin, the hormone that makes you hungry
- Maintains muscle protein synthesis
- Protects lean mass from being broken down for energy
A study published in the American Journal of Clinical Nutrition showed that going from a low protein diet to a high protein diet raised daily calorie burn by about 4 to 5 percent. That adds up to roughly 50 to 75 extra calories burned each day just from eating more protein.
The satiety effect is strong. Research found that eating a high protein meal led to the lowest energy intake at the next meal in both lean and obese people. The study confirmed that protein is the most satiating macronutrient.
Can You Lose Fat And Build Muscle At The Same Time?
Yes, with high protein intake and resistance training.
A landmark study put men on a 40 percent calorie deficit with intense training six days per week for four weeks. The group eating 2.4 g protein per kg:
- Gained 1.2 kg of lean mass
- Lost 4.8 kg of fat
The group eating 1.2 g protein per kg:
- Gained 0.1 kg of lean mass
- Lost 3.5 kg of fat
The high protein group lost more fat and gained more muscle even though both groups ate the same amount of calories and did the same training.
This works best for people who are new to training, returning after time off, or carrying extra body fat. The more advanced you are, the harder it becomes to build muscle in a deficit.
What Are The Best Protein Sources For Weight Loss?
Focus on lean protein sources that give you the most protein per calorie.
Animal sources:
- Chicken breast, 31 g protein per 100 g
- Turkey breast, 29 g protein per 100 g
- Lean beef, 26 g protein per 100 g
- Fish like tuna or salmon, 20 to 25 g protein per 100 g
- Eggs, 6 g protein per egg
- Greek yogurt, 10 g protein per 100 g
- Cottage cheese, 11 g protein per 100 g
Plant sources:
- Tofu, 8 g protein per 100 g
- Tempeh, 19 g protein per 100 g
- Lentils, 9 g protein per 100 g cooked
- Chickpeas, 8 g protein per 100 g cooked
- Edamame, 11 g protein per 100 g
A study found that both plant and animal protein triggered the same satiety hormone response when protein and calories were matched. The source matters less than hitting your total intake.
Protein powder can help if you struggle to reach your daily target. Whey protein costs around $40 to $80 AUD for a 1 kg tub. Look for products with at least 20 to 30 grams of protein per serve.
How Should You Spread Protein Throughout The Day?
Eat 20 to 40 grams of protein at each meal.
Research shows that eating more than 40 grams in one sitting does not boost muscle protein synthesis more than 40 grams. Spreading your protein across three to four meals makes better use of what you eat.
A sample day hitting 140 grams:
- Breakfast, 3 eggs and Greek yogurt = 35 grams
- Lunch, chicken breast with vegetables = 40 grams
- Dinner, salmon with rice and salad = 35 grams
- Snack, protein shake = 30 grams
Higher protein at breakfast helps control appetite all day. One study found that a high protein breakfast suppressed hunger hormones better and reduced snacking compared to a low protein breakfast.
Is High Protein Safe For Your Kidneys?
For healthy people, yes.
A meta-analysis of 74 randomized controlled trials found no significant difference in kidney function between high protein diets (16 to 45 percent of calories from protein) and low protein diets (5 to 23 percent of calories from protein).
A two year study, the longest protein study to date, found no harmful effects on kidney function in healthy adults eating higher protein.
The concern applies to people who already have kidney disease. If you have existing kidney problems, talk to your doctor before increasing protein.
Does High Protein Affect Bone Health?
No negative effect for healthy people.
Some older theories suggested that high protein increases acid load and weakens bones. Research does not support this.
A meta-analysis found no difference in bone mineral density between high and low protein groups. In fact, low protein intake is now considered a risk factor for bone loss in older adults.
The Framingham Osteoporosis Study of 615 older adults found that higher protein intake was linked to less bone loss over four years, not more.
Will High Protein Help You Keep Weight Off?
Yes. High protein helps prevent weight regain after you lose it.
A study found that people who added extra protein after losing 10 percent of their body weight regained only 17 percent of the weight over three months. People who did not add protein regained 37 percent.
Most of what the high protein group regained was lean mass. Most of what the low protein group regained was fat.
Six out of seven people who lose weight gain it back. One reason is that dieting without enough protein causes muscle loss, which slows metabolism. Keeping protein high protects muscle and keeps your metabolic rate from dropping as much.
FAQ
How fast will I see results eating high protein?
Most people notice reduced hunger within the first week. Fat loss results depend on your calorie deficit, but many see changes in body composition within four to eight weeks.
Do I need protein powder?
No. Whole foods work just as well. Protein powder is a convenient option if you struggle to hit your daily target through meals alone.
Can I eat too much protein?
Long term consumption above 2 g per kg per day appears safe for healthy adults. The upper limit for well-adapted people is about 3.5 g per kg per day. Above this level, digestive and metabolic issues can occur.
What if I am vegetarian or vegan?
Plant proteins work the same as animal proteins when matched for total protein and calories. Combine different plant sources like beans and rice, tofu with grains, or use pea protein powder to hit your targets.
Does protein timing matter?
Spreading protein across meals matters more than specific timing. Having protein after training helps, but total daily intake is the main factor for results.
Will protein make me bulky?
No. Building large amounts of muscle requires years of heavy training and eating above maintenance calories. Protein during a calorie deficit helps you keep existing muscle and look more toned as fat comes off.
What is the cheapest way to eat high protein?
Eggs, canned tuna, chicken thighs, Greek yogurt, cottage cheese, legumes and protein powder offer the best protein per dollar. A dozen eggs costs around $6 to $8 AUD and gives you 72 grams of protein.
High-protein diets can support weight loss when combined with the right portions—find out if 2 eggs a day provide enough protein. Interestingly, protein also affects other areas of health, including how protein influences hair growth. Connect with a Richmond personal trainer for a comprehensive nutrition strategy.
