Among overweight and obese women aged 60 to 75, consuming more protein while doing resistance training does not lead to greater gains in muscle strength, endurance, or aerobic fitness compared to doing resistance training alone or with a higher-carbohydrate diet.
See the scientific wording
In overweight and obese women aged 60–75, a higher protein diet (1.28 g/kg/day) during resistance training does not significantly enhance improvements in muscular strength, endurance, or aerobic capacity beyond those achieved with resistance training alone or with a higher-carbohydrate diet.
Very strong evidence
Randomized trialsOne good-quality study supports this claim.
What the research says
1 study reviewedSupporting (1)
Randomized Controlled TrialHuman2018
Older women who did strength training got stronger and more fit no matter if they ate more protein or more carbs — the exercise made them better, not the diet. So adding extra protein didn’t help them get stronger or more endurance than just working out.
Contradicting (0)
No contradicting studies found yet
That doesn't mean it's settled — it just means no study has tested the opposite.
Quality-weighted scoring: we follow the GRADE framework — each study is rated High, Moderate, Low, or Very Low based on study design, methodology rigor, and risk of bias. A single high-quality RCT can outweigh several weaker observational studies.
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When older adults perform resistance exercises, their muscles experience mechanical tension that triggers signals inside muscle cells to build more contractile proteins and improve how nerves communicate with muscles. This makes muscles stronger and able to work longer, regardless of whether they eat more protein or more carbohydrates. The body adapts to the physical stress of lifting weights by recruiting more muscle fibers and firing them more efficiently, and these changes happen even when protein intake is not increased beyond normal levels.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting study
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Among overweight and obese women aged 60 to 75, consuming more protein while doing resistance training does not lead to greater gains in muscle strength, endurance, or aerobic fitness compared to doing resistance training alone or with a higher-carbohydrate diet.
Mechanism
1 studyLifting weights makes muscles stronger and more enduring by improving how nerves and muscles work together. Eating more protein helps keep muscle mass from shrinking, but it doesn't make you stronger or more enduring than lifting weights alone. The body's response to physical effort is the main driver of improvement, not extra protein.
When older adults perform resistance exercises, their muscles experience mechanical tension that triggers signals inside muscle cells to build more contractile proteins and improve how nerves communicate with muscles. This makes muscles stronger and able to work longer, regardless of whether they eat more protein or more carbohydrates. The body adapts to the physical stress of lifting weights by recruiting more muscle fibers and firing them more efficiently, and these changes happen even when protein intake is not increased beyond normal levels.
Mechanical tension from resistance exercise activates mechanosensitive proteins in skeletal muscle, initiating intracellular signaling cascades.
These signals activate mTOR and MAPK pathways, increasing muscle protein synthesis and satellite cell activity.
Neural adaptations increase motor unit recruitment and firing frequency, enhancing force production.
Improved neuromuscular efficiency and preserved muscle mass lead to gains in strength, endurance, and functional capacity.
Less supported by current evidence, but not ruled out
Eating more protein raises amino acid levels in the blood, which turns on a cellular pathway that builds muscle proteins. However, this pathway does not produce stronger muscles or better endurance beyond what resistance training alone achieves, because the body's ability to use those proteins for functional improvement is already maximized by the mechanical stimulus of exercise.
Dietary protein increases postprandial plasma leucine concentrations.
Leucine activates the mTORC1 signaling pathway in skeletal muscle.
mTORC1 activation increases translation initiation and ribosomal biogenesis, enhancing net muscle protein accretion.
Muscle protein accretion is sufficient to preserve fat-free mass but does not augment strength or endurance gains beyond those driven by mechanical loading.
Evidence from Studies
Supporting (1)
Community contributions welcome
Effects of Adherence to a Higher Protein Diet on Weight Loss, Markers of Health, and Functional Capacity in Older Women Participating in a Resistance-Based Exercise Program
Older women who did strength training got stronger and more fit no matter if they ate more protein or more carbs — the exercise made them better, not the diet. So adding extra protein didn’t help them get stronger or more endurance than just working out.
Contradicting (0)
Community contributions welcome
Score Breakdown
No multi-axis breakdown available yet. The overall Pro / Against score above is the best signal.
- No clinical evidence is available; the score reflects mechanistic plausibility only.
What Would Prove This
Per GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this claim, ordered from strongest to weakest.
Systematic Review and Meta-Analysis of High-Protein Diets Combined with Resistance Training in Older Overweight and Obese Women
Population: Overweight and obese women aged 60–75; Intervention: Higher protein diet (1.28 g/kg/day) during resistance training; Comparator: Resistance training alone or resistance training with higher-carbohydrate diet; Outcomes: Changes in muscular strength (e.g., 1RM), endurance (e.g., repetitions to fatigue), and aerobic capacity (e.g., VO2 max); Duration: Minimum 8 weeks.
Double-Blind Randomized Controlled Trial of High-Protein vs. High-Carbohydrate Diets During Resistance Training in Older Overweight Women
Population: Overweight and obese women aged 60–75; Intervention: Higher protein diet (1.28 g/kg/day) with resistance training; Comparator: Higher-carbohydrate diet with resistance training and resistance training alone; Outcomes: Changes in 1RM, endurance capacity, and VO2 max; Duration: 12 weeks; Design: Randomized, double-blind, placebo-controlled for dietary compliance monitoring.
Prospective Cohort Study of Dietary Protein Intake and Functional Outcomes in Older Overweight Women Undergoing Resistance Training
Population: Overweight and obese women aged 60–75 enrolled in a supervised resistance training program; Exposure: Self-reported or biomarker-verified protein intake ≥1.28 g/kg/day; Comparator: Protein intake <1.28 g/kg/day; Outcomes: Longitudinal changes in strength, endurance, and aerobic capacity over 6–12 months; Design: Prospective, with baseline and periodic assessments.
Cross-Sectional Analysis of Protein Intake and Functional Performance in Older Overweight Women Engaging in Resistance Training
Population: Overweight and obese women aged 60–75 currently performing resistance training; Exposure: Single measurement of dietary protein intake; Outcomes: Single measurement of muscular strength, endurance, and aerobic capacity; Design: One-time assessment without temporal sequence.
Case Report of an Overweight 72-Year-Old Woman on a 1.28 g/kg/day Protein Diet During Resistance Training with Stable Functional Outcomes
Population: Single overweight woman aged 72; Intervention: 1.28 g/kg/day protein diet during resistance training; Comparator: None; Outcomes: Subjective or objective changes in strength, endurance, aerobic capacity over time; Duration: Variable.