Yes. This can happen. If some with Type 1 diabetes has a family history of Type 2 diabetes as well, and they are injecting large amounts of insulin for long periods of time, they are at risk for "double diabetes", which is basically Type 1 AND Type 2 diabetes, or Type 1 with insulin resistance.

A Type 1 diabetic who becomes overweight due to lifestyle can also develop "double diabetes". This is why it's important for *everyone* to follow a healthy diet the majority of the time.

That said, I am more concerned that you have developed autoimmune thyroid disease. Your risk is much higher because you have another autoimmune disease, Type 1 diabetes. This can cause rapid and severe weight gain that will not respond to lifestyle changes. You will need thyroid replacement hormone. Severely low thyroid hormone is a medical emergency, so please see your doctor for a test to rule it out.

There are also other causes for rapid weight gain, including some medications.

If you have gained 60 pounds in 6 months, I would see your doctor for a full physical ASAP.

If you do have insulin resistance, your doctor may add a Type 2 diabetes oral medication to your insulin routine.