Most adults aiming to lose weight should eat between 1.0 and 1.2 grams of protein per kilogram of body weight each day. For a 180-pound person, that works out to roughly 82 to 98 grams daily. If you’re exercising regularly while cutting calories, your needs climb higher, into the range of 1.4 to 2.0 grams per kilogram. That same 180-pound person who lifts weights or does regular cardio would aim for about 115 to 164 grams per day.
How to Calculate Your Target
Start by converting your body weight from pounds to kilograms. Divide your weight in pounds by 2.2. A 150-pound person weighs about 68 kilograms, a 200-pound person about 91 kilograms. Then multiply by the range that fits your activity level:
- Sedentary or lightly active, losing weight: 1.0 to 1.2 g/kg per day
- Regularly exercising while losing weight: 1.4 to 2.0 g/kg per day
Here’s what that looks like in practice. A sedentary 160-pound person cutting calories needs about 73 to 87 grams of protein daily. A 200-pound person hitting the gym three to four times a week would aim for roughly 127 to 182 grams. These numbers are well above the standard Recommended Dietary Allowance of 0.8 grams per kilogram, which represents the minimum to prevent deficiency, not the amount that optimizes fat loss or protects muscle.
Why Protein Matters More in a Calorie Deficit
When you eat fewer calories than you burn, your body doesn’t just pull energy from fat. It also breaks down muscle tissue for fuel. Eating more protein shifts the balance, giving your body the raw materials it needs to maintain (or at least minimize the loss of) lean muscle while the scale drops. A study on older women found that those eating 1.2 grams of protein per kilogram per day had measurably better muscle strength and less fat accumulation than those eating only the standard 0.8 grams.
Losing muscle during a diet is more than a cosmetic problem. Muscle tissue burns more calories at rest than fat does, so preserving it keeps your metabolism from slowing down as you lose weight. That metabolic advantage compounds over weeks and months.
Protein Burns More Calories to Digest
Your body uses energy just to break down and absorb food, a process called the thermic effect. Protein requires far more energy to process than other nutrients. Digesting protein increases your metabolic rate by 15 to 30 percent of the calories consumed, compared to 5 to 10 percent for carbohydrates and 0 to 3 percent for fats. In practical terms, if you eat 200 calories of protein, your body spends 30 to 60 of those calories just processing it. The same 200 calories from fat costs your body almost nothing to digest. This doesn’t make protein a free food, but it does mean a higher-protein diet has a small built-in metabolic advantage over one heavy in fats or refined carbs.
How Protein Controls Hunger
The biggest reason protein helps with weight loss may be the simplest: it keeps you full. In a controlled trial, participants who increased their protein intake from 15 percent to 30 percent of total calories, without changing their carb intake, spontaneously ate 441 fewer calories per day. They weren’t told to eat less. They just didn’t feel as hungry. Over 12 weeks, they lost an average of 10.8 pounds, with 8.2 of those pounds coming from fat.
This appetite-suppressing effect appears to work through the brain’s sensitivity to satiety signals rather than through simple changes in hunger hormones. In fact, the participants’ levels of the hunger hormone ghrelin actually increased during the study, yet they still ate less. Their brains responded more strongly to fullness cues, overriding the hormonal push to eat more. For anyone who has struggled with willpower on a diet, this is significant. Higher protein doesn’t just help you resist hunger; it reduces the hunger you need to resist.
Spread It Across Your Meals
Your body can only use so much protein at once to build and repair muscle. Research shows that muscle-building signals peak at around 30 grams of protein in a single meal and don’t increase much beyond that threshold. Eating 60 grams in one sitting isn’t twice as effective as 30 grams. The strongest association with lean mass and strength came from consuming two or more meals per day that each contained 30 to 45 grams of protein.
If your daily target is 100 grams, for example, you’re better off eating three meals with roughly 30 to 35 grams each than loading it all into dinner. A chicken breast has about 30 grams. Two eggs and a cup of Greek yogurt together hit around 25 to 30 grams. A can of tuna or a cup of cottage cheese gets you there as well. Planning each meal around a protein source makes the math straightforward.
Adjustments for Older Adults
Adults over 65 face a distinct challenge. Aging muscle becomes less responsive to protein, a phenomenon researchers call anabolic resistance. The same 30-gram serving that triggers robust muscle repair in a 30-year-old produces a weaker response in a 70-year-old. Nearly half of all protein in the body is found in muscle, and muscle mass naturally declines with age, increasing the stakes of getting enough protein during weight loss.
For healthy older adults, the recommended target is at least 1.0 to 1.2 grams per kilogram per day, the same range as the general weight-loss recommendation. Those with chronic conditions or recovering from illness may need 1.2 to 1.5 grams per kilogram. Pairing protein intake with resistance exercise amplifies the effect, helping counteract the blunted muscle-building response that comes with age.
Is High Protein Safe?
For healthy adults, high-protein diets are not known to cause kidney damage or other medical problems. The longstanding concern that extra protein overtaxes the kidneys applies specifically to people who already have kidney disease, because compromised kidneys struggle to clear the waste products of protein metabolism. If you have kidney disease, diabetes, or another chronic condition, your protein targets may need to be different. Otherwise, intakes in the 1.0 to 2.0 g/kg range are well within the bounds of what healthy kidneys handle routinely.
Putting It All Together
The simplest approach: calculate your weight in kilograms, multiply by 1.2 as a starting point, and aim for that number in grams of protein each day. If you exercise regularly, nudge it up toward 1.4 to 1.6 grams per kilogram. Spread your intake across at least three meals, with each one containing 30 or more grams. Choose whole food sources like poultry, fish, eggs, dairy, legumes, and tofu as your foundation. Protein powders can fill gaps but aren’t necessary if your meals are planned around protein-rich foods.
Track your intake for a week or two to build awareness of where you stand. Most people are surprised to find that their breakfast and lunch fall well short of 30 grams while their dinner far exceeds it. Rebalancing those meals is often the single most effective dietary change for both fat loss and muscle preservation.