A high protein diet generally means eating more than 0.8 grams of protein per kilogram of body weight per day, which is the current Recommended Dietary Allowance (RDA) for adults. In practice, most nutrition professionals consider intake above 1.2 g/kg per day, or more than 25% of total calories from protein, to be high protein. For a 154-pound (70 kg) person, that translates to roughly 84 grams or more per day, compared to the RDA minimum of 56 grams.
The Numbers That Define “High Protein”
There are two ways to measure protein intake: as a percentage of your total daily calories, or as grams per kilogram of body weight. Both give useful context.
The federal Acceptable Macronutrient Distribution Range (AMDR) sets protein at 10 to 35% of total calories for adults. Eating at the higher end of that range, above 25 to 30%, is where most people start to feel they’re on a “high protein” diet. On a 2,000-calorie diet, 30% protein equals 150 grams per day.
In grams per kilogram, the picture is clearer. The RDA of 0.8 g/kg is a minimum to prevent deficiency, not an optimal target. Many active adults eat between 1.2 and 1.6 g/kg without thinking of it as unusual. Once you exceed 1.6 g/kg consistently, you’re firmly in high protein territory. Bodybuilders and competitive athletes sometimes push to 2.0 g/kg or higher, which Harvard Health describes as a reasonable upper ceiling for the average healthy person who isn’t an elite athlete.
Why People Choose Higher Protein
The most common reason is weight management. Protein is the most filling macronutrient, and it also costs your body more energy to digest. Your body uses 20 to 30% of the calories in protein just to break it down and absorb it, compared to 5 to 10% for carbohydrates and less than 3% for fat. This “thermic effect” means that 200 calories of chicken breast produces less usable energy than 200 calories of bread, giving protein a small but real metabolic advantage.
Beyond the calorie math, protein suppresses hunger hormones more effectively than fat or carbs. People on higher protein diets consistently report feeling satisfied longer between meals, which makes it easier to eat less overall without white-knuckling through cravings.
Protein Needs Change With Age
The RDA of 0.8 g/kg was set for the general adult population, but a growing body of evidence suggests older adults need significantly more. After about age 50, the body becomes less efficient at turning dietary protein into muscle tissue. Without enough protein, you lose muscle mass faster, a condition called sarcopenia that affects strength, balance, and independence.
Current research recommends that older adults consume 1.2 to 2.0 g/kg per day depending on their health status. For older adults already experiencing muscle loss, one study published in Frontiers in Nutrition estimated the recommended intake at 1.54 g/kg per day. Those dealing with serious illness or injury may need up to 2.0 g/kg. What looks like a “high protein” diet for a 30-year-old may simply be adequate nutrition for a 70-year-old.
Effects on Bone Health
An old concern about high protein diets is that they leach calcium from bones, increasing fracture risk. This idea came from the observation that higher protein intake raises calcium levels in urine. But more recent and comprehensive evidence tells the opposite story. Higher protein intake is associated with greater bone mineral density, a slower rate of bone loss, and reduced risk of hip fracture, as long as calcium intake is also adequate. The International Osteoporosis Foundation notes that in older adults, getting too little protein is a more serious problem for bones than getting too much.
Safety for Your Kidneys
High protein diets are not known to cause kidney problems in healthy people. Your kidneys filter the waste products created when protein is broken down, and healthy kidneys handle this increased workload without issue. The concern is real, however, for people who already have kidney disease. In that case, the extra waste products from a high protein diet can accelerate the decline in kidney function. If you have diabetes, chronic kidney disease, or other conditions that affect how your kidneys work, protein intake is something to discuss with your doctor before making changes.
What High Protein Looks Like in Practice
To put the numbers into real food, here’s what different protein levels look like for a 154-pound (70 kg) person eating 2,000 calories per day:
- RDA minimum (0.8 g/kg): 56 grams. About two chicken breasts or three cups of Greek yogurt spread across the day.
- Moderately high (1.2 g/kg): 84 grams. Adding a serving of eggs at breakfast and a palm-sized portion of fish at dinner gets most people there.
- High (1.6 g/kg): 112 grams. This typically requires a protein source at every meal plus a high-protein snack.
- Very high (2.0 g/kg): 140 grams. At this level, most people rely on a combination of lean meats, dairy, legumes, and sometimes a protein supplement to hit their target.
The source of your protein matters too. Whole food sources like poultry, fish, eggs, dairy, beans, and lentils come packaged with other nutrients your body needs. Processed meats and protein bars often carry added sodium, sugar, or saturated fat that can undercut the benefits of the protein itself.
How to Tell If Your Intake Is Right
If you’re a generally healthy adult who exercises regularly, eating between 1.2 and 1.6 g/kg is a well-supported range that goes beyond the bare minimum without pushing into extremes. If you’re over 50, recovering from surgery, or actively trying to build muscle, 1.6 to 2.0 g/kg is where the evidence points. Going above 2.0 g/kg hasn’t shown consistent additional benefits for most people and simply means your body has more nitrogen waste to process.
The simplest way to check your intake is to track what you eat for three to five typical days using a food diary or app. Multiply your weight in kilograms by your target range and see how your current eating stacks up. Many people who think they eat “a lot” of protein find they’re barely at the RDA, while others who worry about overdoing it are comfortably within normal ranges.