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Blood sugar, also known as glucose, is the body's main source of energy, according to the Mayo Clinic 1.

The body gets most of its glucose by metabolizing the carbohydrates in food. But going too long without food can cause dangerously low blood sugar in people with medical conditions such as diabetes 3.

The Wrap Up

The body relies on a complex system to keep blood sugar levels within a healthy range. In order to understand fasting blood sugar levels, it can be helpful to know a bit more about how this system works. The liver also stores and produces glucose to keep blood sugar levels from getting too low between meals or overnight, as described by the University of California, San Francisco38. Maybe you eat breakfast at a later time than normal. The short answer is, it usually won't. " The body just has too many defense mechanisms. But these medications can also cause low blood sugar if a person takes too much or doesn't eat enough carbs. " If you have diabetes and are planning on fasting, be sure to discuss it with your doctor. But going too long without food can cause dangerously low blood sugar in people with medical conditions such as diabetes.

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