Protein is the one macro almost everyone under-eats and over-argues about. The official recommendation says one number, fitness influencers say triple that, and the research sits somewhere in between. This guide gives you a clear target based on your actual goal, plus a realistic plan for hitting it without living on chicken breast.
The Short Answer
| Goal | Daily protein target |
|---|---|
| Sedentary, general health | 0.8 to 1.0 g per kg body weight |
| Active, staying healthy | 1.2 to 1.6 g per kg |
| Losing fat (keeping muscle) | 1.6 to 2.2 g per kg |
| Building muscle | 1.6 to 2.2 g per kg |
| Age 60+ (fighting muscle loss) | 1.2 to 1.6 g per kg minimum |
For a 75 kg (165 lb) person who lifts weights or wants to lose fat, that lands between 120 and 165 grams per day. Notice that fat loss and muscle gain have the same target. That is not a typo, and the reason matters.
Why the RDA Is Not Your Target
The famous 0.8 grams per kilogram figure is the Recommended Dietary Allowance. It was designed to prevent deficiency in the general population, the nutritional equivalent of the minimum wage. It keeps you out of trouble; it does not make you thrive.
Studies using better measurement methods consistently suggest the true optimal intake for active people is roughly double the RDA. Meta-analyses of resistance training studies find muscle gains plateau around 1.6 g per kg for most people, with a buffer up to 2.2 g per kg providing a small extra edge for some.
So when someone says "you only need 0.8 grams per kilo," they are quoting a survival floor, not a performance target.
Protein While Losing Fat: The Most Important Case
Here is where protein earns its reputation. When you eat in a calorie deficit, your body needs energy and it will happily take it from muscle as well as fat. Adequate protein is the main dietary signal that tells your body to keep the muscle and burn the fat.
Higher protein during a diet does three measurable things:
- Preserves lean mass. Dieters eating 1.6+ g per kg lose significantly less muscle than those eating the RDA.
- Kills hunger. Protein is the most satiating macronutrient per calorie. Swapping 15 percent of carbs for protein reliably reduces spontaneous snacking in studies.
- Burns more in digestion. The thermic effect of protein is 20 to 30 percent, meaning up to a third of protein calories are spent digesting it, versus 5 to 10 percent for carbs and 0 to 3 percent for fat.
If you have already worked out your calorie budget with a TDEE calculation, protein is the next number to fix. And if stubborn fat is the goal, the same logic drives our science-based belly fat plan: deficit first, protein second, patience third.
How Much Protein Is in Real Food?
Targets are useless without a mental map of food. Rough protein counts for common servings:
| Food | Serving | Protein |
|---|---|---|
| Chicken breast | 150 g cooked | 45 g |
| Greek yogurt (plain) | 200 g tub | 20 g |
| Eggs | 2 large | 12 g |
| Canned tuna | 1 can (drained) | 25 g |
| Lentils (cooked) | 1 cup | 18 g |
| Tofu (firm) | 150 g | 18 g |
| Whey protein | 1 scoop | 24 g |
| Cottage cheese | 1 cup | 25 g |
| Ground beef (90/10) | 150 g cooked | 38 g |
A 140 g protein day is genuinely easy once you see it as building blocks: Greek yogurt at breakfast (20), tuna lunch (25), a normal chicken dinner (45), cottage cheese snack (25), plus the background protein in grains and vegetables (15 to 25). Done.
Timing and Distribution: Does It Matter?
Less than total intake, but yes, a little. Muscle protein synthesis responds best when protein arrives in meaningful doses throughout the day rather than one giant dinner.
Practical rules that capture most of the benefit:
- Aim for 25 to 45 g of protein per meal, 3 to 4 times a day
- Include one protein-rich meal within a couple of hours of training
- Older adults benefit from slightly bigger doses per meal (35 to 45 g), because aging muscle is less sensitive to the signal
The "anabolic window" panic (chugging a shake within 30 minutes of your last rep) is outdated. The window is more like a garage door: several hours wide.
Common Myths, Quickly
"High protein wrecks your kidneys." In healthy people, no. Studies up to 3 g per kg show no decline in kidney function. Pre-existing kidney disease is a different situation and needs medical guidance.
"Plant protein does not count." It counts. Plant proteins are slightly less rich in leucine, so vegetarians should aim for the higher end of the target range and mix sources (legumes plus grains plus soy), but building muscle on plants is entirely doable.
"More protein always equals more muscle." Above roughly 2.2 g per kg, extra protein is just expensive calories. The ceiling exists.
How to Actually Track It
Most people who guess their protein intake overestimate it by 30 to 50 grams. The background protein in bread, rice, and vegetables feels bigger than it is, and portion sizes are hard to eyeball.
You do not need to weigh food forever. Track honestly for one or two weeks to calibrate your eyes, then spot-check occasionally. Snapping a photo of your plate with Calow gives you a protein and calorie estimate in seconds, which makes the calibration phase almost effortless. We covered how photo-based tracking works and how accurate it is in our guide to AI calorie counting.
The Bottom Line
- The RDA (0.8 g per kg) prevents deficiency. It is not a target for anyone who trains or diets.
- For fat loss or muscle gain, aim for 1.6 to 2.2 g per kg of body weight per day.
- Spread it over 3 to 4 meals of 25 to 45 g each.
- Total daily intake beats perfect timing, every time.
- Track for two weeks before assuming you already eat enough. You probably do not.
Protein is not a supplement industry conspiracy or a bodybuilder obsession. It is the most practically useful number in nutrition after calories, and getting it right makes every other part of your diet easier.