Weight reduction seems to be an effective method to control blood glucose level in diabetic patients. For weight loss, it's advised to follow these nutritional tips:
    Adding non-starchy vegetables to your diet, such as; carrots, broccoli and cauliflower.
    Reducing the intake of refined grains and added sugars. Also, whole grains products are highly recommended.
    Avoiding processed foods.
On the same context, the following diets seem to be suitable for diabetic patients to lose some weight:
1.    DASH diet: it's basically designed to lower blood pressure in hypertensive patients, but it's found that DASH diet is effective also in weight loss, especially in diabetic patient. The strategy of DASH diet depends mainly on vegetables, fruits and whole grains, with restriction of sodium, sugar and fats.
2.    Mediterranean diet: it depends mainly on vegetables, nuts, dairy products, fish and healthy fats (such as avocado and olive oil).
3.    Plant-based diet: it includes limiting (not inhibition) of animal products like meat. This diet depends mainly on fruits, vegetables and legumes.
4.    Low-fat diet: this diet depends mainly on lean proteins (such as legumes, fish and chicken) as well as fruits, whole grains and vegetables (especially leafy vegetables).
On the other side, low-carb or no-carb diet as well as intermittent fasting seem to be not a good choice for diabetic patients.