How Much Protein Should I Eat to Lose Weight?

Eat 1.2–1.6 g of protein per kilogram of body weight a day while you lose weight. At 80 kg (176 lb), that means 96–128 g. The 2025–2030 Dietary Guidelines for Americans set that range and say to adjust it to your calorie needs. On a diet those needs are smaller, so the same grams take up more of the day. The checks below show how much more.

How much protein should I eat to lose weight?

If you think in pounds, divide by 2.2 first, then multiply by 1.2 for the low end and by 1.6 for the high end. I ran five body weights against the Guidelines’ range so you can find your row.

Body weight	Low end (1.2 g/kg)	High end (1.6 g/kg)
60 kg (132 lb)	72 g	96 g
70 kg (154 lb)	84 g	112 g
80 kg (176 lb)	96 g	128 g
90 kg (198 lb)	108 g	144 g
100 kg (220 lb)	120 g	160 g

The Guidelines give a range but no formula for choosing a spot in it. That part is my own habit. I start at 1.2 g/kg and move toward 1.6 if I’m lifting weights or my goal sits far below what I used to eat, then hold the number for two weeks before changing it.

Between two rows, each extra 10 kg adds 12 g at the low end and 16 g at the high end. A 75 kg adult gets 90–120 g. A woman at a smaller weight can read the same range worked through in protein per day for a woman to lose weight.

Does protein take a bigger share of my calories on a diet?

Yes. The same grams fill a larger slice of a smaller food budget. Protein supplies 4 kcal per gram (FAO conversion factors), so 96–128 g is 384–512 kcal. The table shows that share at four calorie levels.

Daily calories	Share at 96 g	Share at 128 g	Ceiling at 35%
2,400 kcal	16%	21%	210 g
2,000 kcal	19%	26%	175 g
1,800 kcal	21%	28%	157 g
1,500 kcal	26%	34%	131 g

The ceiling is the top of the Acceptable Macronutrient Distribution Range, which allows protein to supply 10–35% of calories. Wolfe and colleagues set that range beside the 0.8 g/kg allowance. That allowance was derived as the minimum that avoids losing body nitrogen. Use the ceiling to cap a plan and never aim for it.

Check your row first. A 110 kg adult on 1,800 kcal who takes 1.6 g/kg gets 176 g, which is 39% of the day’s calories. The ceiling there is 157 g. When the two disagree, I go with the ceiling. For where the goal comes from, see what a calorie deficit is.

Your own calorie goal comes from the calorie calculator, which works from age, height, weight and activity level. Its results for women bottom out at 1,200 calories and for men at 1,500.

Why does extra protein help when I eat less?

It keeps you fuller and helps you hold on to muscle, though the effects are modest. In a feeding study of 19 adults, raising protein from 15% to 30% of energy cut spontaneous intake by 441 kcal a day. Over 12 weeks they lost 4.9 kg, 3.7 kg of it fat. With only 19 people, the result points a way and predicts little.

A meta-analysis of 24 trials with 1,063 adults compared higher-protein and standard-protein diets at the same calorie level. After a mean of 12.1 weeks the higher-protein groups had lost 0.79 kg more weight and 0.87 kg more fat. They kept 0.43 kg more fat-free mass too. None of the three gaps reaches a full kilogram, so I’d call the boost modest.

The strongest effect I found came with hard training. A four-week trial in young men put them about 40% below their needs. Those on 2.4 g/kg gained 1.2 kg of lean mass and lost 4.8 kg of fat, while those on 1.2 g/kg gained 0.1 kg and lost 3.5 kg. They trained six days a week, and 2.4 g/kg is above the Guidelines’ range, so it doesn’t describe a desk job and a lunchtime walk.

What does 120 g of protein look like in a diet day?

Here is one day for an 80 kg adult, with a protein food at each of four eating times. I took each record from USDA FoodData Central and added the rows myself, using the specific Atwater energy where the record has it.

Meal	Food and grams	Protein	Energy
Breakfast	Greek yogurt, plain, nonfat, 200 g	20.6 g	122 kcal
	Blueberries, raw, 80 g	0.6 g	46 kcal
	Rolled oats, dry, 40 g	5.4 g	152 kcal
	Almonds, raw, 15 g	3.2 g	88 kcal
Lunch	Light tuna in water, drained, 107 g	20.3 g	96 kcal
	Cannellini beans, canned, drained and rinsed, 130 g	9.6 g	146 kcal
	Baby spinach, raw, 40 g	1.1 g	8 kcal
	Olive oil, 13.5 g	0.0 g	119 kcal
Snack	Cottage cheese, lowfat 2%, 150 g	16.5 g	126 kcal
	Strawberries, raw, 100 g	0.6 g	33 kcal
Dinner	Chicken breast, braised, 110 g	35.3 g	183 kcal
	White rice, cooked, 200 g	5.4 g	260 kcal
	Broccoli, raw, 150 g	3.9 g	48 kcal
	Olive oil, 13.5 g	0.0 g	119 kcal
Total		122.5 g	1,546 kcal

The day reaches 122.5 g of protein for 1,546 kcal. That is 1.53 g/kg at 80 kg, and 32% of the day’s calories (490 kcal of 1,546). Breakfast gives 29.8 g, lunch 31.0 g, the snack 17.1 g and dinner 44.6 g. Dinner carries the most. If you struggle to reach your number, look at how the grams are spread across the day before you add any food. A high protein breakfast for weight loss is the easiest place to move some.

One trap spoils sums like this: the state you weigh. I weighed the oats dry. Log 40 g of cooked porridge as dry oats and you overcount, because cooked oats are mostly water. Write the state next to the grams every time. For whole dinners built the same way, see these high protein recipes for weight loss.

When do these numbers stop applying?

A few people should skip these figures. Kidney disease changes how much protein is safe, so that number is for your doctor to set. In pregnancy and while breastfeeding your midwife or doctor sets it, and so does anyone on a medically supervised diet. The grams above assume an adult.

Age matters too. The PROT-AGE study group recommends at least 1.0–1.2 g/kg for people over 65, so a calculator built for 30-year-olds is the wrong tool there.

Serious lifters are the other exception. The International Society of Sports Nutrition says 1.4–2.0 g/kg is enough for most exercising people. It adds that resistance-trained lifters may need 2.3–3.1 g/kg to keep muscle on a low-calorie phase. At 80 kg that is 112–160 g and 184–248 g. On 1,800 kcal, 184 g is already 41% of the day, above the 35% ceiling, so those figures belong to trained people with larger budgets.

Protein doesn’t change the other limits. A deficit of 500 kcal a day or more is the usual step in the AHA/ACC/TOS guideline, which keeps women at 1,200–1,500 kcal and men at 1,500–1,800 kcal. NHS advice is to lose 0.5–1 kg (1–2 lb) a week. Don’t eat below the bottom of those ranges to fit in a protein number, and don’t chase a faster pace.

Before changing anything, find out where you stand: weigh what you eat on three ordinary days and set the average against your row in the first table. A shortfall of more than a fifth is worth one extra serving of the highest-protein food you already like.

When I add a day up, the grams I trust are the ones with a source, and Calsa shows protein next to calories and the source behind each entry’s number.