I have type 1 diabetes and I have achieved normal average blood sugar levels, i.e. an HbA1c of less than 6%. I've done this mainly through diet and exercise and also through meditation and other relaxation techniques and with natural treatments and techniques that improve physical, emotional, mental and spiritual health.
For diet, the main thing is to reduce the amount of starchy carbohydrates you eat. Instead, eat lots of vegetables, especially raw, organic green ones and sprouted beans and seeds. You can have plant fats from avocados, nuts and flax and olive oils. You can have plant protein from hemp, spirulina, nuts and seeds. It's better for your overall health to have just small amounts of lean meat, fish and eggs.
If you are using insulin and have a dose with each meal, this will also help reduce your margin of error when working out how much to have with a meal and so reduce your risk of having a hypo. It will also help you lose any excess fat on your tummy, which is a bonus!
It's important to exercise regularly, preferably at least 20 minutes strenuous exercise at least every other day.
Meditation is a great way to relax and to raise your overall emotional tolerance in times of stress. A fantastic way to do this is to listen to a CD with headphones. The CD has binaural beat technology to help you meditate deeply, as though you had been practising for years!
By doing these things, you will also help yourself become super-healthy, you will be less likely to develop any of the nasty long term complications of diabetes and you will probably live longer!
If you want more information, I've written a hub on 'How to Achieve Normal Blood Sugar Levels'.