The correlation between weight loss and health is tricky because a lot of other factors (family history, physical activity, nutrition, prejudice, etc.) come into play. Science and medicine are still working on exactly how it all comes together.
On top of that, how your doctor PERSONALLY FEELS about fat people can make a huge difference on how your “weight-issue” is treated.
“In a study of over 620 primary care physicians, >50% viewed obese patients as awkward, unattractive, ugly, and noncompliant. One-third of the sample further characterized obese patients as weak-willed, sloppy, and lazy.”
Many fat people have anecdotes of negative experiences and weight biased discrimination in medical settings.