Blood sugar is simply the level of glucose (sugar) in your bloodstream.
To maintain the energy levels and have stable blood sugar, our body uses two hormones—insulin and glucagon. So, after a meal when your blood sugar goes up, insulin helps cells absorb the glucose. On the other hand, when your blood sugar drops, glucagon instructs the liver to release glucose into the bloodstream. However, if this system is disturbed—when the insulin levels are too low or your body isn’t responding well to insulin—the blood sugar level rises. This could lead to diabetes, harm your blood vessels and develop into heart disease. Measuring your blood sugar levels is therefore crucial for your wellbeing. A high score indicates that your body is doing a good job at maintaining your blood glucose levels.  
PS: You should have fasted overnight before the blood test for the results to be accurate.

Read more about health indicators included in My Nightingale here.

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