Ask 10 people how much protein you should eat. You'll get 10 different answers ranging from 40g to 250g per day. Most of them are wrong. Here's the honest answer — with the actual numbers, the science behind them, and how to hit them without stressing about food.
For most active adults trying to change their body composition — lose fat, build muscle, or both:
0.7 to 1 gram of protein per pound of your GOAL body weight.
Not current weight. Not lean body mass. Not "ideal weight" from some 1950s chart. GOAL weight.
So if you weigh 200 lbs and want to weigh 160: aim for 112-160g of protein per day.
If you weigh 140 lbs and want to weigh 150 (muscle gain): aim for 105-150g of protein per day.
Split it across 3-4 meals. That's it. That's the whole equation.
The government's Recommended Daily Allowance (RDA) says 0.36g per pound. That's the MINIMUM to prevent deficiency in a completely sedentary adult. It's not "optimal" — it's "won't die from lack of protein."
Serious sports scientists (Alan Aragon, Dr. Menno Henselmans, Eric Trexler) have run dozens of studies. The consensus for active adults trying to build or preserve muscle: 0.7-1g per pound of goal bodyweight. Higher (1.2g+) has diminishing returns.
Higher end (1g+) if: you're in a calorie deficit trying to lose fat while preserving muscle. Lower end (0.7g) if: you're at maintenance and just trying to stay healthy.
| Your Situation | Protein Target (per lb of goal weight) |
|---|---|
| Fat loss (in a calorie deficit) | 0.9-1.0g |
| Muscle building (calorie surplus) | 0.8-0.9g |
| Recomp (fat loss + muscle gain, at maintenance) | 1.0g |
| Maintenance / general health | 0.7-0.8g |
| Adults over 60 (fighting sarcopenia) | 1.0-1.2g |
| Endurance athletes | 0.7-0.9g |
| On a GLP-1 medication | 1.0g (non-negotiable) |
If you weigh 250 and want to weigh 180, don't eat 250g of protein — you don't need that much. Eat 180g. That's what your body composition goal requires. Overshooting protein won't hurt you, but it's unnecessary calories.
The #1 mistake in fat loss. When you cut calories without enough protein, your body eats muscle for energy. You lose weight — but a lot of it is muscle. Metabolism drops. Weight regain becomes inevitable. Protein preserves the muscle.
Same targets apply. It's just harder to hit them with plants. Requires more strategic meal planning — legumes, tofu, tempeh, seitan, protein powder. Doable — just requires more intention.
Your body can absorb about 30-50g of protein per meal for muscle synthesis. Eating 150g of protein in one sit-down doesn't build more muscle than spreading it across 3-4 meals. Spread it.
For adults with healthy kidneys, protein amounts up to 2g per pound of bodyweight have been studied and shown safe. There is no evidence that "too much protein" damages healthy kidneys. If you have kidney disease — different story, talk to your doctor. Otherwise, don't fear protein.
Here's the practical playbook:
3 meals × 40g = 120g. Add a snack or two = 150-180g. That's it.
Protein shakes exist for a reason. When you're going to fall short — 1-2 shakes fixes it. Skip the fancy pre-workout / mass gainer products. Basic whey isolate (or plant protein) is all you need. $30-50/tub, lasts a month.
Grab the free 7-Day Comeback Plan — it includes protein calculations customized to your goal weight.
Get the Free 7-Day Plan →Protein confusion is real. The math isn't complicated: 0.7-1g per pound of goal body weight, spread across 3-4 meals.
Ignore RDA numbers (too low for anyone who trains). Ignore bro science numbers (higher isn't always better). Stick with what actually works for adults building or preserving muscle.
Hit your protein number every day for 30 days. Then evaluate. Your body will show you if it's working.