First, the statistics, for type 1 they are reliant on old data. People who were diagnosed with type 1 in the past had very different treatment, from people diagnosed today. Before the eighties glucose testing relied on urine and insulin schedules were far less flexible. Even so I know of people who have had diabetes for 40-60 years and have no complications. Now though it is less down to luck and genetics we have the tools to get better control.
As to healthy eating, you will indeed find a multitude of opinions on the internet.
Personally I find a balanced using good quality fresh foods and choosing (for the most part)lower glycemic carbs works very wel for me. This is what I do.
By balanced I mean including food from every food group.I include mostly less refined and wholegrain starches, pulses, fruits and lots of vegetables. I tend to eat leaner meats and lower fat (but not necessarily extrememly low fat) dairy. I eat eggs, but not every day. I use mostly olive oil and occasionally sunflower for cooking but I also have some uncooked oil every day (olive/walnut) on a salad. I sometimes add nuts, pinenuts and seeds to dishes. Oh and I live in France so I definitely have a couple of glasses of red every day!
By good quality fresh, I really mean I tend to cook everything from the raw ingredients, I don't eat much that was manufactured in a factory.
By low GI, I tend to look for the lower gi of the food I want to eat. So for example I'll choose small new potatoes over old mashed ones. I'll choose heavy grainy breads rather than fluffy white. I try to include pulses like lentils and chickpeas on some days (low GI carb +protein). I eat porridge made with semi-skimmed milk for breakfast, usually with some berries and a few almonds but I choose the larger, less finely milled oats as they have a far lower GIs than the powdery stuff.(especially the quick cook packets which are really high gi)
There is lots of info on GI here
http://www.glycemicindex.com/
Hopefully you are on MDI and use 2 separate insulins, a basal and a rapid. (you need different advice for mixed insulins)
With this type of insulin you can gain very good control but it really is important though to learn to count your carbs (and at least until you get used to it weighing your starchy carbs, I still do it at home) and learning to adjust your rapid insulin accordingly. The best way to do this is probably doing a DAFNE course but there is also an online course
http://www.bdec-e-learning.com/
and there are 2 useful books (though American)
Think Like a pancreas Garry Scheiner
Using Insulin John Walsh.
And lastly, and in my opinion it doesn't get mentioned enough. Don't forget the third tool at our disposal EXERCISE. Everything ifrom gardening, housework and walking to spinning classes and weight lifting can help increase insulin sensititivy.
This is what I've done for almost 6 years and have had good HbA1cs so, for me, this type of regime hopefully gives me the best possible chance of avoiding complications and a premature death.
(as with so many things though, different things work for different people, if you don't like a way of life it won't work for you as you won't stick with it)