Speaking from a medical perspective (or at least a medical student's perspective) it's not necessarily the fat that would get you, but the complications stemming from the added stress that the fat puts on your body, ie high BP, high cholesterol etc all adding stress to a heart that is already stressed from trying to keep up with a body that has outgrown it. That said, if a doctor, preferably a diving doctor, does a good and thorough work-up on you then there is no reason you shouldn't be able to dive. The size itself shouldn't stop you.
I would recommend being a bit more conservative with your dive planning. The US Navy tables and algorithms on which all of the recreational tables and computers are based were designed around tests on young fit sailors. Your different body size and increased fatty tissue percentage is gonna affect the way nitrogen dissolves into and out of your tissues, and there's really no way to predict how. Just to be safe you might want to go a letter-group more conservative on a table, or on a computer just call your dive a bit before it says you need to.
A
I would recommend being a bit more conservative with your dive planning. The US Navy tables and algorithms on which all of the recreational tables and computers are based were designed around tests on young fit sailors. Your different body size and increased fatty tissue percentage is gonna affect the way nitrogen dissolves into and out of your tissues, and there's really no way to predict how. Just to be safe you might want to go a letter-group more conservative on a table, or on a computer just call your dive a bit before it says you need to.
A