Diabetes is one of the most common modern diseases and most often is caused by bad diet and unhealthy living.

New research has shown black seed to be a perfect natural remedy for diabetes 2. 

Type 1 diabetes usually occurs in children and young adults. It's nearly always treated with insulin. A healthy diet that controls starches and sugars (carbohydrates) is important. Black seed oil is is more commonly used for type 2 diabetes, but under a Dr.'s supervision may be helpful in diabetes 1. Regular exercise can reduce risk for heart disease and other complications.

Symptoms include sudden weight loss, excessive thirst and hunger, frequent urination, nausea, vomiting, poor growth, and lack of energy. Although black seed oil may help it should be prescribed by a Practitioner. If type 1 diabetes is not treated, a condition called ketosis occurs. Ketosis can cause coma and even death.

Type 2 diabetes usually occured in older adults. However, it is now becoming more common in children and teens. It is in this type that black cumin has been shown to be most beneficial.

Those with type 2 diabetes often are overweight and unfit. They cannot make enough insulin to keep their blood glucose in control. A meal plan for weight control and regular exercise is the first treatment tried.

Pay attention in your diet if you are including foods with hydrogenated fats. These modern processed fats have been discovered in Scientific papers to cause many illnesses such as Diabetes, heart disease, etc. etc. If diet and exercise are not enough, medicine may be required. Black seed has been shown in scientific study to benefit diabetic conditions. 

A herbal composition for diabetes using various herbs has been patentd in US, No: 6042834

This comprises of

15 percent by weight of dried, powdered seeds of Trigonella foenum-graecum;
23 percent by weight of dried, powdered seeds of Nigella sativa;
10 percent by weight of dried, powdered leaves of Origanum vulgare;
10 percent by weight of dried, powdered sap of Rosmarinus officinalis;
15 percent by weight of dried, powdered beans of Lupinus termis;
12 percent by weight of dried, powdered black leaves of Lawsonia inermis;
and 15 percent by weight of dried, powdered seeds of Foeniculum vulgare.

The herbal composition may be administered in non-encapsulated powder form or in capsule form. A method of treatment for diabetes using the herbal composition comprises monitoring a diabetic patient's blood sugar level; administering to the patient the herbal composition in an amount of about 9 g per day for at least about 60 days until such date as the patient's blood sugar level achieves and maintains normalcy;
Administering to the patient the herbal composition in the amount of about 6 g per day for about another 7 days; administering to a patient the herbal composition in the amount of about 3 g per day for about another 14 days; and discontinuing administration, or, alternatively, continuing administration of the herbal composition as necessary for the patient at about less than or equal to 3 g per day of the herbal composition.

Other Studies with Black seed oil in Diabetes have shown very clear benefits.
Various animals have been studied in relation to diabetes/high blood sugar. All showed a significant decrease in glucose levels after 48 hours of supplementation with black seed oil. Blood glucose levels continued to fall for up to a few weeks, when a levelling occurred and a therapeutic balance was maintained.  

The prominent physician and herbalist Muhammed Salim Khan has confirmed the benefits with human subjects. The best results with diabetes will be obtained by combining black seed oil with dietary adjustment, involving a low carbohydrate diet that includes raw fats and protein.