What did the Morton 2018 meta-analysis conclude about the 1.6 g/kg guideline?

Morton et al. (2018) used a regression approach and found that the result was not statistically significant, calling into question the strength of the 1.6 g/kg recommendation. Timestamp: 11

What does the Tagawa meta-analysis say about protein intake and hypertrophy?

Tagawa and colleagues conducted a larger analysis (about 75 studies) and found diminishing returns as protein increases, but even beyond 1.6 g/kg there were still gains in lean body mass. Timestamp: 22

Do you gain more lean mass if you exceed 1.6 g/kg protein?

Yes, the Tagawa analysis reported continued lean mass gains beyond 1.6 g/kg, but the gains become smaller as intake rises, indicating diminishing returns. Timestamp: 32

What are the speaker's personal protein targets?

The speaker states a personal target of 1 to 1.3 g of protein per pound of body weight, acknowledging it can be hard to hit. Timestamp: 45

What is the minimum protein intake suggested to get most gains?

The speaker suggests that you can get most gains with about 0.7 g per pound of body weight. Timestamp: 52

How Much Protein Should You Really Eat To Build Muscle?

Stronger By Science

Sports5 min read1 min video

Dec 27, 2024|15,487 views|686|63

Save to Pod

Key Moments

On this page

TL;DR

Protein helps, but beyond ~1.6 g/kg (0.73 g/lb) gains diminish.

Key Insights

Morton 2018 meta-analysis suggested 1.6 g/kg as a target to maximize muscle building, but the regression result wasn’t statistically significant, so certainty around a single optimal dose is limited.

Tagawa and colleagues expanded to ~75 studies and found diminishing returns with higher protein intake, yet they still observed lean mass gains even beyond 1.6 g/kg, indicating a nuanced dose–response.

A practical intake band discussed is 0.7–1.3 g per pound of body weight, acknowledging that reaching the upper end is challenging for many lifters.

Most gains may be captured around 0.7 g/lb, roughly 1.5 g/kg, which provides a realistic baseline for consistent protein planning.

Higher intakes (toward 1.3 g/lb) can yield incremental gains for some individuals, especially with high training demands, though the payoff is smaller.

Converting units matters: 1.6 g/kg ≈ 0.73 g/lb, so practitioners should stay consistent with their chosen unit to avoid under- or overfeeding.

INTRODUCTION TO PROTEIN TARGETS FOR MUSCLE

The video opens by noting how protein targets for muscle growth are a topic of debate, with many influencers promoting high intakes. It frames the discussion around two key analyses that shape current thinking: a 2018 meta-analysis led by Morton and colleagues and a broader synthesis by Tagawa and colleagues. The goal is to move beyond hype and examine what the data actually show about how much protein supports hypertrophy, and where practical targets lie for lifters.

MORTON 2018 META-ANALYSIS AND ITS LIMITATIONS

Morton and coauthors conducted a meta-analysis to explore protein’s effect on muscle growth, highlighting a target of about 1.6 g/kg. However, the analysis used a regression framework and, according to the video, did not reach statistical significance for defining a clear optimum. The main takeaway is caution: despite popular uptake of a fixed value, the evidence from this study alone cannot definitively pin down a universal maximum dose for hypertrophy.

THE TAGAWA 75-STUDY META-ANALYSIS AND ITS FINDINGS

A more recent and expansive synthesis by Tagawa and colleagues pooled around 75 studies on protein intake and hypertrophy in resistance-trained lifters. Their findings emphasize diminishing returns: as protein intake increases, the incremental gains in muscle growth tend to lessen. Yet importantly, the analysis also shows that even beyond the 1.6 g/kg benchmark, there can still be lean mass gains, indicating the dose–response is complex and not capped at a single threshold.

DIMINISHING RETURNS IN PROTEIN INTAKE

The concept of diminishing returns helps explain why simply piling on protein yields smaller and smaller gains after a certain point. Early increments in protein tend to drive more pronounced hypertrophy than later ones. The Tagawa results reinforce this idea while also teaching that there is no hard ceiling—some individuals may still experience additional lean-mass improvements with higher protein intakes, though the magnitude may be modest and context-dependent.

PRACTICAL RANGES: 0.7–1.3 G/LB

In practical terms, the speaker outlines a workable band of 0.7–1.3 g of protein per pound of body weight. They acknowledge that hitting the upper end is challenging for many people, especially those with larger frames or demanding schedules. The key message is to operate within this feasible range rather than chase ever-higher totals that yield progressively smaller benefits, thereby improving adherence and overall diet quality.

0.7 G/LB AS THE MAJORITY GAINS BASIS

Within the suggested range, about 0.7 g per pound is presented as sufficient to capture the majority of lean-mass gains. This lower bound translates to roughly 1.5 g/kg and is highlighted as a realistic, attainable target for most lifters. Framing protein needs around this baseline helps balance hypertrophic potential with practical eating patterns and day-to-day feasibility.

HIGHER INTAKES: IS THERE VALUE AT 1.0–1.3 G/LB?

The transcript notes that pushing toward the upper end—near 1.3 g/lb—may still offer incremental gains for certain individuals, especially under heavy training loads or during specific conditioning phases. The implication is not that higher intakes are useless, but that the additional muscle growth they support is incremental and may not justify the extra dietary effort for everyone.

UNIT CONVERSIONS: KG VS LB

A practical theme is converting between g/kg and g/lb. The video implicitly reinforces that 1.6 g/kg roughly equals 0.73 g/lb, so consistent use of one unit is essential to avoid miscalculation. Understanding this conversion helps practitioners translate research recommendations into meal plans and daily protein targets without misalignment or confusion.

APPLYING EVIDENCE TO TRAINING PROGRAMS

Translating findings into training plans involves balancing protein intake with training volume, recovery, and overall calories. The evidence supports a positive role for protein across a range of intakes, but it does not demand maximum protein for gains. Practically, lifters can structure meals to meet their chosen target, distribute protein across daily meals, and adjust based on progress in lean mass and performance, keeping adherence and total energy in mind.

LIMITATIONS AND OPEN QUESTIONS

Two major analyses illustrate uncertainties in this area. Morton's study shows that a fixed optimum is not strongly supported, while Tagawa's work acknowledges heterogeneity across individuals and study designs. These limitations remind us that protein needs are not one-size-fits-all and that factors like training intensity, body composition, and diet adherence will influence outcomes differently for different people.

TACTICAL DIETARY PLANNING FOR DURABLE GAINS

From a practical standpoint, the guidance is to set a feasible protein target within 0.7–1.3 g/lb and commit to consistency. Plan meals to meet the target, track intake if helpful, and be prepared to adjust based on progress in lean mass and training demands. The emphasis is on sustainable habits rather than chasing marginal gains through impractical protein overloads.

CONCLUSION: OPTIMIZING WITHIN A PRACTICAL BAND

Overall, the video reframes the protein conversation from chasing a singular ‘maximal’ dose to understanding a dose–response with meaningful but diminishing returns. The evidence supports protein’s role in hypertrophy within a practical range and suggests that most gains can be achieved without extreme intakes. By aligning targets with feasibility and consistency, lifters can optimize muscle growth while maintaining dietary balance and long-term adherence.

Mentioned in This Episode

●Studies Cited

●People Referenced

Protein Intake Cheat Sheet for Muscle Gains

Practical takeaways from this episode

Do This

Aim for roughly 1–1.3 g of protein per pound of body weight for most gains.

If you can't hit 1–1.3 g/lb, you can still make most gains with about 0.7 g/lb.

Be mindful that protein beyond 1.6 g/kg shows diminishing returns, though some gains may still occur.

Avoid This

Don't assume the 1.6 g/kg guideline is a hard maximum for everyone.

Don't rely on protein alone—calorie intake and training quality matter too.

Common Questions

The video says many influencers push about 1.6 g of protein per kilogram of body weight, though this guideline is challenged by later analyses. The Morton 2018 meta-analysis is cited as the basis, but the speaker notes it wasn’t statistically significant. Timestamp: 0