Not true. I’ve met many skinny type 1 diabetics.
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TYwo completly opposite diseases.
Type 1 = Pancreas fails to produce the hormone insulin because of damage to the insulin cells. Insulin injections are needed to replace the insulin.
Type 2 is caused by the overproduction of insulin causing insulin resistance. This causes glucose to be stored as fat. Adding insulin injections causes even more damage
Two completely opposite diseases treated one way.
Type 2 is a dietary disease, not a hormonal disease. You don’t fix dietary diseases with medication
Apparently, there is some evidence that Type 2 is autoimmune, but a very different set of targets than Type 1.