When blood sugar levels are consistently high, it can cause damage to the blood vessels and organs in the body. This damage can lead to a range of health problems, including:

1. Cardiovascular disease: High blood sugar levels can damage the blood vessels and increase the risk of heart attack, stroke, and other cardiovascular problems.

2. Kidney disease: Diabetes is the leading cause of kidney disease, and high blood sugar levels can damage the kidneys over time, leading to kidney failure.

3. Nerve damage: Uncontrolled blood sugar levels can damage the nerves, leading to numbness, tingling, and pain in the hands and feet.

4. Eye damage: High blood sugar levels can damage the blood vessels in the eyes, leading to diabetic retinopathy, a condition that can cause blindness.

5. Foot problems: Nerve damage and poor circulation can lead to foot problems, including ulcers, infections, and even amputation.

In addition to these health problems, uncontrolled blood sugar can also weaken the immune system and make it harder for the body to fight off infections. This can lead to a range of health problems, including frequent infections, slow healing, and an increased risk of infection-related complications.

Overall, uncontrolled blood sugar is more dangerous because it can lead to a range of serious health complications over time. It is important for people with diabetes to work with their healthcare provider to keep their blood sugar levels within a healthy range and to take steps to manage their diabetes effectively.