Ask your doctor to test your thyroid. Sometimes it is the cause

I lost a lot of weight and hair with Graves’ disease which is from the thyroid.

I’m T1 since 1966 and have a lot of hair. I worked with another T1D who lost a lot of hair when she was first diagnosed but found she also had a high thyroid condition which is why I mentioned it above. My husband has low thyroid and is very hairy.

Hmmm… I’ve been a T1 since 1964 and I still have a full head of hair. I’ve not heard of this as a side effect.

Yes!! I just started on insulin a month ago (July 15th), and about 2 weeks ago I realized that I'm losing a lot of hair.