Mixed
When muscle strength is normalized to body mass, obese individuals exhibit relative weakness compared to non-obese individuals, which contributes to functional limitations and disability risk.
Losing weight is often more effective for improving mobility than building muscle alone, because obesity creates a 'relative weakness' where your muscles are strong but not strong enough for your body weight. To improve function, you must either reduce the load (lose fat) or significantly increase muscle mass to improve the strength-to-weight ratio.
However, when maximum muscular strength is normalised to body mass, obese individuals appear weaker. This relative weakness may be caused by reduced mobility, neural adaptations and changes in muscle morphology.
Why this rating
Consistent findings across multiple studies (Blimkie, Maffiuletti, Hulens, Lafortuna) show lower relative strength.
Source
The impact of obesity on skeletal muscle strength and structure through adolescence to old age
David Tomlinson et al. · Biogerontology · 2015
DOI 10.1007/s10522-015-9626-4
More from this paper
- Obesity acts as a chronic overload stimulus on antigravity muscles (e.g., quadriceps, calf), resulting in higher absolute maximum muscle strength compared to non-obese individuals, regardless of age.Good
- Obesity is associated with reduced muscle quality (strength normalized to muscle mass) in some studies, but this finding is inconsistent and likely confounded by methodological differences in measuring muscle size and neural activation.Moderate
Related findings · Mixed
- Bariatric surgery (VSG and RYGB) is the most effective and sustainable treatment for obesity, producing marked and sustained weight loss that non-surgical interventions cannot match.Strong
- Severely protein-deficient diets (2–3% energy) induce lean body mass loss and metabolic imbalance, whereas adequate protein intake (0.66 g/kg/d minimum) is a prerequisite for maintaining muscle, bone, and physiological function.Strong
- For patients with Class III obesity (BMI >39.9 kg/m2), metabolic bariatric surgery (MBS) is significantly more effective than any currently approved medication, with BilioPancreatic Diversion (BPD) showing the highest estimated weight loss.Strong
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