Muffler (silver) and exhaust pipe on a Ducati 695 motorcycle. A muffler (silencer in English) is a device for reducing the amount of noise emitted by the exhaust of an internal combustion engine.
Quick Answer. Normal blood sugar levels should be  less than 100 mg/dL when fasting and less than 140 mg/dL two hours after eating, according to WebMD. People without diabetes tend to have blood sugar levels of around 60 to 90 mg/dL before eating.
What is a normal blood sugar number? A healthy person is expected to have a blood sugar level of 100 milligrams per deciliter of blood after they have fasted, according to WebMD. A normal blood sugar level in a person who has eaten within 2 hours of a blood test is approximately 140 milligrams per deciliter.