When very overweight people lose a lot of weight, their muscles get much better at using insulin to pull sugar out of the blood, which helps fix their diabetes or prediabetes.

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Pro

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Evidence from Studies

Supporting (1)

40

Community contributions welcome

40

Restoration of insulin responsiveness in skeletal muscle of morbidly obese patients after weight loss. Effect on muscle glucose transport and glucose transporter GLUT4.

Cohort Study

Human

1992 Feb

When very overweight people lost about 43 kg after surgery, their muscles got much better at using insulin to take in sugar — almost back to normal. This shows that being overweight causes muscle insulin problems, but losing weight can fix it.

Contradicting (0)

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No contradicting evidence found

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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.

Source Study

Restoration of insulin responsiveness in skeletal muscle of morbidly obese patients after weight loss. Effect on muscle glucose transport and glucose transporter GLUT4.

Score: 40

DOI: 10.1172/JCI115638

Similar Assertions

When people are extremely overweight, their muscles are much worse at pulling sugar out of the blood — even when insulin is present — but this gets much better after they lose weight.

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90%

Even people with type 2 diabetes can see their muscles start working like healthy muscles again after losing a lot of weight — and it’s not because they make more sugar transporters, but because the ones they have work better.

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75%

After losing weight, muscles get better at using sugar not because they make more GLUT4 proteins, but because the existing proteins move to the right place or work better.

40

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74%

Even though muscles get better at using sugar after weight loss, the amount of the GLUT4 sugar transporter protein in the muscle doesn’t change — so something else must be making it work better.

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71%

In women who are overweight or obese after menopause, gaining muscle from exercise without cutting calories might actually make the body worse at handling blood sugar — so more muscle doesn’t always mean better health in this group.

40

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71%