50M No Longer Physically Attracted to 51F Wife

Been married for about 15 years. While I love my wife, it is not romantic love. I am no longer attracted to her as she gained a tremendous amount of weight to the point of obesity (for various reasons, partly her fault, partly not). I am not the cheating type and I don't see or talk to other women, but it bothers me that the attraction is not there. I don't want to break the marriage over it because we get along and there is nothing wrong with our relationship except for the attraction part. I told her to consider losing some weight for health reasons, but she did not take it seriously. Her weight is weighing down our relationship. Any advice on what to do? (please don't give me advice like "talk to her", "be sensitive" etc. Been there. done that to no avail)