Foods that help control blood sugar levels are healthy carbohydrates such as fruits and vegetables, high-fiber foods, foods with omega-3 fatty acids, and foods with unsaturated fats.
I don't think there are any specific alternatives to diabetic food. If you have diabetes and are allergic to diabetic food you will have to monitor, make due, and eat food that is more "traditional."
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http://www.diabetes-diabetic-diet.com/diabetic_food.htm is a good reference about the diabetic food chart. It lists the foods one can consume if they have diabetes and all the calories and other nutrition info in the food.
There are several places online where you can find outlines on the types of food a diabetic should and shouldn't eat. Here is one place to look http://www.butlersguild.com/index.php?subject=103
Diabetic meals are significant to people that are diabetic or pre-diabetic and would need to eat these certain types of foods to help control their insulin levels. You can find diabetic meal ideas at http://www.diabeticlifestyle.com/
There are a number of places you can purchase food online. Most times you don't have to purchase diabetic specific food, you just have to know what and how much of something you can eat. Try Diabetic Direct. http://www.diabeticdirect.com/
There are many websites offering information on diabetic foods. Here is what the American Diabetes Association has to say about diabetic foods: http://www.diabetes.org/food-and-fitness/food/what-can-i-eat/
You can find a diabetic food list at http://diabetes.webmd.com/diabetic-food-list-best-worst-foods. It will help explain what foods to eat and what to stay away from.
A diabetic should eat low calories food all the time. He should eat salads more often and eat sweet dishes to very minimum level and prefer baked food as it reduces cholesterol levels.
Blood types have no bearing on what types of food a person can eat.
The doctor that diagnosed you with having diabetes should have given you a meal plan, with foods you could eat. There are also diabetic recipes online. www.dlife.com/diabetes/diabetic-recipes