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@DFP
Aside from the blood pressure, things like "short of breathness" "feeling heavy" and poor sleep can all be drastically improved by improving general fitness/conditioning.
You can both be very fat and extremely fit.
Blood pressure and heart longevity is a more complicated matter though. Some of the fittest people in the world drop dead from heart attacks when in their prime.
Also diabetes isn't as simple as "become thin = no diabetes". I had two uncles both frighteningly skinny, whom both died due to Type II diabetes. A lot of it is genetics, some of it is fatness, but fitness, muscle mass, hormonal balance and insulin sensitivity are all very important factors to consider.