Yes, athletes need significantly more protein than sedentary adults. The standard recommendation for the general population is 0.8 grams of protein per kilogram of body weight per day. Athletes need roughly double that: 1.4 to 2.0 g/kg/day, depending on the type and intensity of training. For a 175-pound (80 kg) person, that’s the difference between 64 grams and 112 to 160 grams daily.
Why Exercise Increases Protein Needs
Every training session damages muscle fibers. Your body repairs them by building new muscle protein, a process called muscle protein synthesis. This repair work requires amino acids from the protein you eat. The harder and longer you train, the more raw material your body needs to recover and adapt. Without enough protein, you recover more slowly and miss out on the strength or endurance gains your training should produce.
One amino acid in particular, leucine, acts as a trigger for this repair process. Consuming about 2.5 grams of leucine in a meal appears to maximally switch on muscle protein synthesis in younger adults. That threshold is easily met with 20 to 40 grams of a high-quality protein source like eggs, dairy, meat, or fish. Plant proteins contain less leucine on average (about 7% of total protein versus nearly 9% or higher in animal sources), so plant-based athletes may need slightly larger servings to hit the same trigger point.
How Much Protein by Sport Type
The ideal range depends on what kind of training you do.
- Strength and power athletes (weightlifters, sprinters, football players) need the most: 1.6 to 2.0 g/kg/day. This supports the muscle growth and repair demands of heavy resistance training.
- Endurance athletes (runners, cyclists, triathletes) have traditionally been told to aim for 1.0 to 1.6 g/kg/day, but more recent research using precise measurement methods suggests the true requirement is closer to 1.8 g/kg/day on standard training days. During periods of heavy training with restricted carbohydrate intake, that number may climb to 2.0 g/kg/day or higher.
- Team and intermittent sport athletes (soccer, basketball, tennis) fall in the middle at 1.4 to 1.7 g/kg/day.
One surprising finding: endurance athletes may actually need as much protein as strength athletes. Long-distance training damages muscle fibers in a different way than lifting weights, but the repair demands are still substantial. A review in Sports Medicine concluded that endurance athletes should target 1.8 g/kg/day as a baseline, which is 50% more than what sedentary adults need and closer to the strength-training range than most people expect.
How to Spread Protein Throughout the Day
Your body can only use so much protein at once for muscle building. Eating 100 grams in one meal and skipping it the rest of the day is less effective than distributing your intake evenly. The current evidence points to about 0.4 g/kg per meal across at least four meals as the sweet spot. For an 80 kg athlete, that works out to roughly 32 grams per meal, four times a day.
If you’re aiming for the higher end of protein intake (around 2.2 g/kg/day), spreading that over four meals means about 0.55 g/kg per meal, or roughly 44 grams for an 80 kg person. After exercise specifically, endurance athletes benefit from a slightly larger dose of about 0.5 g/kg to maximize repair of damaged muscle proteins.
Timing matters most in the window right after training. Consuming a protein-rich meal or snack relatively soon after exercise takes advantage of the period when your muscles are most responsive to incoming amino acids. Beyond that immediate post-workout window, simply hitting your daily total across evenly spaced meals matters more than obsessing over exact timing.
Protein Needs During Weight Loss
Athletes cutting weight face an additional challenge: losing fat while preserving muscle. When you’re in a caloric deficit, your body is more likely to break down muscle protein for energy, making dietary protein even more important. Research shows that consuming around 2.4 g/kg/day (three times the standard RDA) during a caloric deficit doesn’t provide extra benefit over 1.6 g/kg/day for preserving lean mass, so there’s a ceiling to how much helps.
The rate of weight loss also matters. Athletes who lose weight slowly (about 0.7% of body weight per week) while consuming 1.6 g/kg/day of protein actually gained 2.1% lean body mass during their cut. Those who lost weight quickly at the same protein intake showed no change in lean mass. So if you’re trying to lean out, the combination of higher protein and a gradual caloric deficit protects your muscle far better than crash dieting.
Plant-Based vs. Animal Protein
Animal proteins like whey, eggs, and meat are more digestible and contain more leucine per gram than most plant sources. Plant-based proteins also tend to score lower on measures of biological value and net protein utilization. This doesn’t mean plant-based athletes can’t meet their needs, but it does mean they need to be more intentional about it.
The practical fix is straightforward: eat a bit more total protein if you rely primarily on plant sources, and combine different plant proteins throughout the day to cover any gaps in essential amino acids. Soy and legumes are among the stronger plant options. Some plant proteins, like corn protein, actually have very high leucine content, though they fall short in other essential amino acids. Variety is the key strategy for plant-based athletes.
Do Older Athletes Need Even More?
There’s a common belief that aging muscles become resistant to protein’s muscle-building signal, a phenomenon called anabolic resistance. This is well documented in sedentary older adults. But a review in Sports Medicine found that master athletes (generally those over 35 to 40) who maintain regular training have muscle characteristics and protein metabolism similar to younger athletes. In other words, staying active appears to largely prevent the anabolic resistance that comes with aging.
The practical recommendation for master athletes mirrors what younger athletes should aim for: about 1.6 g/kg/day for those doing resistance training and 1.8 g/kg/day for endurance training, spread across four to five evenly spaced meals of roughly 0.3 to 0.4 g/kg each. Athletes who are still concerned can add a modest safety margin, bumping their post-exercise protein to about 0.37 g/kg per serving (roughly 28 grams for a 75 kg person). One additional tip from the research: consuming a last protein-containing meal one to two hours before sleep may help support overnight recovery.
Is High Protein Safe for Your Kidneys?
This is one of the most persistent concerns about high-protein diets, and the short answer for healthy athletes is reassuring. A review in the Journal of the American Society of Nephrology found that high protein intake was not associated with declining kidney function in people with normal kidneys. The concern does apply to people with existing kidney disease, where higher protein intake was linked to faster decline in kidney function. But for athletes with healthy kidneys, intakes in the 1.4 to 2.0 g/kg/day range are considered safe.
The one population that should be cautious is people with a single kidney, who are generally advised to stay below 1.2 g/kg/day. For everyone else with normal renal function, the evidence consistently shows that the protein levels recommended for athletes don’t pose a kidney risk.