(a careful) yes
Type 2 diabetics have Insulin
resustance, but early on are able to make extra Insulin to overcome the resistance.
Over time, they are less and less able to do that. Then they need medicine, and eventually need to take insulin. If a type 1 diabetic gains weight, he can also develop Insulin resistance and his doses will need to be increased. Weight loss decreases resistance in both types 1 & 2.