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The correlation is actually negative: if you don't produce insulin, you'll find it extremely hard to put on weight.

Children with Type 1 diabetes, before receiving insulin, look like they are starving to death.

Yep, I lost about 40 pounds in the two months leading up to my T1D diagnosis.

Same, 30lb when I was already a skinny kid, and 21lb of that in the last 3 weeks prior to diagnosis.