That's interesting for you to say that.
I am not sure when you were diagnosed; I was diagnosed in my mid-30s so I am very aware of life without diabetes.
I have always been reasonably active. The exception to this was a 45 minute round trip drive to work every day for 18 months about 5 years before diabetes. I hated not having the time for myself to exercise, to cook and even to do boring things like banking. I put on a little weight (it takes a lot for me to do that) and felt a bit bleurgh.
Now, I work from home. On the plus side I have no commute, I avoid the colds going around the offics and can prepare something fresh for lunch every day. On the negative side, it is very very easy never to leave my desk and never to leave the house for exercise and I miss out on the social scene around work.
I make a concerted effort to get out, go climbing, go to the gym, do some shopping, get on my bike, ... even in the winter. I know, if I don't for a couple of days, I feel bleurgh.
Apart from that, my only illness is sports related (tennis elbow from climbing).
Sorry, that's a long winded way of saying that, apart from the insulin and finger pricking, I look after myself the same with diabetes as I did without it. I don't find diabetes adds any additional demands on my stay healthy regime.
Perhaps I'm lucky, perhaps my baseline fitness helps, perhaps it helps that I hate sitting still and enjoy exercise, perhaps it helps that I seem to have healthy genes (my mother goes to the gym in her mid-70s ... and neither of my parents have diabetes), perhaps it helps I like fruit and veg and don't eat meat, ... or perhaps I am kidding myself.