How Much Protein Do You Actually Need?

Protein is having a moment. Every food brand is adding it to their packaging. Every fitness influencer has a target they swear by. The advice ranges from “just eat more” to hyper-specific gram-per-kilogram prescriptions that change depending on who you ask.

Here’s what the research actually supports.

Why protein matters for active people

Protein provides the amino acids your body uses to repair and build tissue. When you exercise, you create demand for that repair. Resistance training creates micro-damage in muscle fibers that rebuilds stronger. Endurance training stresses connective tissue and metabolic systems that need amino acids to adapt.

Without adequate protein, those repair and adaptation processes become harder to support. You still recover, but often slower and less completely. Over time, that gap can compound into stalled progress.

The evidence-based range

One of the most cited meta-analyses on this topic, Morton et al. 2018 in the British Journal of Sports Medicine, found that muscle gains from resistance training appeared to plateau around 1.6g of protein per kilogram of body weight per day.

That does not mean 1.6g/kg is a magic number. It means it is a strong anchor point. Because individual needs vary, many practitioners use the upper end of that estimate, around 2.2g/kg/day, as a practical upper target. The ISSN position stand gives 1.4-2.0g/kg/day as sufficient for most exercising individuals. In practice, most active people do well somewhere in this range:

1.6 - 2.2g per kg of body weight per day

For a 70kg (155lb) person, that’s roughly 112-154g of protein daily. For an 85kg (187lb) person, it’s 136-187g.

These ranges are meant for generally healthy adults. If you have kidney disease, a medical condition, or specific dietary restrictions, work with a clinician or registered dietitian.

Where you fall in that range depends on a few factors:

• Training intensity: Heavier training creates more repair demand. If you’re in a hard training block, aim higher.
• Caloric deficit: When you’re eating below maintenance (trying to lose fat), protein needs increase. Your body is more likely to break down muscle for energy when calories are scarce. Bumping protein to 2.0-2.2g/kg helps preserve lean mass during a cut.
• Age: Older adults (50+) have reduced muscle protein synthesis response. Slightly higher intake (2.0g/kg+) helps compensate.
• Training type: Endurance-focused athletes may do well toward the lower end (1.4-1.6g/kg). Strength, power, and hypertrophy-focused athletes often benefit from the higher end.

What about the “1g per pound” rule?

The gym-floor advice of “1 gram of protein per pound of body weight” is simple and memorable. It also happens to land within the evidence-based range for most people (1g/lb ≈ 2.2g/kg).

It’s higher than necessary for many situations, but for most healthy active people it is a reasonable, easy-to-remember upper target. If you’re hitting roughly 1g per pound, you’re covered. You don’t need to optimize beyond that.

Distribution matters (a little)

Total daily intake matters most. But there is a secondary benefit to spreading protein across meals rather than loading most of it into dinner.

Muscle protein synthesis has a per-meal ceiling. More protein is not “wasted,” but past a certain point, extra protein in a single meal does not keep increasing the muscle-building signal. Research commonly points to about 25-40g per meal for most people.

You don’t need to be obsessive about this. Aim for a protein source at every meal and you’ll naturally distribute well enough.

Common sources and rough portions

You don’t need supplements to hit these targets, though protein powder is a convenient option when whole food isn’t practical.

A day hitting 140g might look like: eggs and toast at breakfast (25g), chicken salad at lunch (40g), Greek yogurt snack (20g), salmon with rice at dinner (40g), and a small evening snack (15g).

When more isn’t better

For most people, going above 2.2g/kg is unlikely to provide additional benefit for muscle growth. Protein is also the most satiating macronutrient, so very high intakes can suppress appetite and make it hard to eat enough carbohydrates to fuel training.

If you’re eating 3g/kg+ and struggling with energy during workouts, you might be displacing the carbs your body needs for fuel. Balance matters.

So what do you actually do?

Aim for 1.6-2.2g per kg daily. If you don’t want to do math, roughly 1g per pound works fine. Include a meaningful protein source at most meals, bump it up a bit when you’re eating less overall, and don’t lose sleep over hitting an exact number. Consistency across weeks matters more than precision on any given day.

Protein isn’t magic. But it is the macronutrient most people under-eat relative to their activity level. Getting it right removes a common bottleneck to progress.