Diabetes diet. Is there a diet which improves the quality of life of people with Diabetes?

There is not food that will HELP and there is no food that will do harm. There is just food that is a bit complicated to deal with becaus ebody reacts to it unusually, like pizza-bread, cheese and ham separately or in a sandwich are all ok but if you bake them and make a pizza your body takes a long time to process the food so the blood sugar levels go up for a long time.
Well, it is recommended, because people with diabetes have a weaker immune system, to avoid soda, pate, alcohol, and smoking.

There is no diet that will prevent diabetes. There are vegans who develop diabetes. If you have diabetes you want your blood sugar levels as consistent as possible. Most people accomplish this by being careful about both the amount and type of carbohydrates that they have in their diet. Each person is different, has different likes and dislikes, different customs and traditions and maybe even additional health concerns. There is no specific diet for diabetics.

It depends on the type of diabetes you have. If type two then it is suggested to eat healthy and cut out fats and sugars then once settled and your levels are stable and you have lost a decent amount of weight you are allowed to add them back in if you desire but at a balanced level, some are known to live abnormal life again in doing so and even getting rid of the diabetes but those who choose to neglect progress into type one diabetes. If you have type one diabetes then it is best to cut sugar out completely, you need to focus on carbohydrate as this is what your insulin works towards, in most cases you can eat what you want within moderation and treat yourself once in a while.

Count your carbs and correct. If you are on a set amount of carbs eat them when you are supposed to do you do not bottom out. The only things diabetics can't eat are poisones cookies!!

Dieting can definitely help, but even more so with exercise. Dieting will not cure diabetes, but it can help you manage good bloodsugars and A1C levels.

Yes improves with low carb diet. Stay away from high carb foods and sugery drinks

So, a lot of people might tell you to avoid carbs. It helps, sure, but in a world full of carbs it's not really practical. What you need to do is look for a certain KIND of carb.
Carbohydrates fall into two basic categories: simple and complex. Simple carbs are things that metabolize quickly and will spike your blood sugar- white rice and bread, candy, anything high in sugar. Complex carbs are things that metabolize slowly and tend to hold blood sugar steady, and these are what you want. Good examples are whole wheat bread and brown rice.
Protein, fiber, and fat content also matter. Foods high in these behave like complex carbs- they hold blood sugar steadier for longer, and fiber can actually be subtracted from your carb count!