Thanks for taking the interest in my post enough to respond. Some context that might shed some light on their position follows.
This relative has shared concerns that I would be miserable down the road and feel awful about all of the things I couldn't eat or experience. They lament on the emotional pain that they anticipate I will feel as I distance myself away from my prior foods and eating habits. It is noteworthy to add that they also have been someone that provided "treats" for me in the past (I have heard the term "food pusher" recently and it struck a note with me here in this situation). Everyone else in my family, my medical team, and the few that I have told, all congratulated me and expressed their support.