Everyone can lose fat, get stronger, and build muscle with the right diet and exercise — how much they gain might differ, but the ability is there for all of us.
Evidence from Studies
Supporting (4)
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Older adults with diabetes and obesity lost fat and gained muscle after a diet and exercise program, and kept those benefits for months—showing that meaningful body changes are possible for everyone with the right lifestyle habits.
Repeated Resistance Training Reveals the Reproducibility of Muscle Strength and Size Responses Within Individuals
The study shows that everyone who trained got stronger and built muscle over time, even if some improved more than others, which supports the idea that all people can benefit from exercise in these ways.
The study shows that lifting weights helps muscles grow in most people by triggering important hormones, which supports the idea that everyone can build muscle with the right exercise, even if results vary.
The study shows that lifting weights and eating protein help muscles grow in people, even as they age, which supports the idea that everyone can build muscle with the right habits.
Contradicting (2)
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Pharmacological hypogonadism impairs molecular transducers of exercise‐induced muscle growth in humans
The study found that when men have very low testosterone, they don’t build muscle well even if they lift weights, suggesting not everyone can gain muscle the same way.
The study looked at whether people could keep weight off after a diet and exercise program, but most gained it back. It doesn’t prove people can’t lose fat or build muscle, but it shows it’s hard to maintain results.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.