Protein is the most talked-about macronutrient in fitness, and with popularity comes misinformation. Let's clear up the five most persistent protein myths.
Myth 1: Your Body Can Only Absorb 30g of Protein Per Meal
This is the most widespread protein myth, and it's misleading. Your body will absorb virtually all the protein you eat — the question is how efficiently it stimulates muscle protein synthesis (MPS).
Research shows that MPS is maximally stimulated at around 0.4–0.55 g/kg per meal. For an 80 kg person, that's 32–44 g. But "maximally stimulated" doesn't mean the rest is wasted. Excess amino acids are used for other bodily functions, stored, or oxidised for energy.
The takeaway: Spreading protein across 3–4 meals is optimal for muscle building, but eating a large protein meal won't harm you.
Myth 2: High Protein Diets Damage Your Kidneys
This myth originated from medical advice for people with existing kidney disease. For healthy individuals, multiple systematic reviews have found no evidence that high protein intake causes kidney damage.
A 2016 meta-analysis in the Journal of Nutrition followed healthy adults consuming up to 2.8 g/kg of protein per day and found no adverse effects on kidney function.
The takeaway: If you have healthy kidneys, a high-protein diet is safe. If you have kidney concerns, consult your doctor.
Myth 3: Plant Protein Is Inferior to Animal Protein
While individual plant proteins may be lower in certain amino acids, a varied plant-based diet easily provides all essential amino acids. The concept of "complete" vs "incomplete" proteins is outdated.
What matters is your total amino acid intake across the day, not whether each meal contains every essential amino acid.
The takeaway: Plant-based eaters can absolutely meet their protein needs. Combine sources like legumes, grains, nuts, and soy throughout the day.
Myth 4: You Need Protein Immediately After Training
The "anabolic window" — the idea that you must consume protein within 30 minutes of training or lose your gains — has been significantly debunked.
Research shows that total daily protein intake matters far more than timing. The post-workout window is real, but it's measured in hours, not minutes.
The takeaway: Eat a protein-rich meal within a few hours of training. Don't stress about chugging a shake in the locker room.
Myth 5: Protein Shakes Are Necessary
Protein supplements are convenient, but they're not superior to whole food protein sources. A chicken breast, Greek yoghurt, or tin of tuna provides the same amino acids as a protein shake — plus additional nutrients.
Supplements make sense when whole food isn't practical (travelling, tight schedules), but they should supplement your diet, not replace it.
The takeaway: Prioritise whole food protein. Use shakes for convenience, not as a primary source.
The Bottom Line
Protein science has evolved significantly in the last decade. The best approach is straightforward: eat enough protein (1.6–2.2 g/kg for active individuals), spread it across your meals, and don't overthink it.
Tools like Healthly make this easier by showing you exactly how much protein is in each meal — no guesswork required.