I read some articles about this just yesterday and
was surprised, for I take Lantus and
have noticed no weight gain at all. So this could be a factor.
However, a change in metabolism in middle age probably is the real culprit, along with possibly a slower metabolism because you are not eating. Exercise should help both problems. Start walking! Park your car further from the door, take stairs instead of elevators, etc. Or use your lunch hour to do some mild exercise right in your office.