Serum Glucose Normal Range

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Blood Sugar Level

The fluctuation of blood sugar (red) and the sugar-lowering hormone insulin (blue) in humans during the course of a day with three meals. One of the effects of a sugar-rich vs a starch-rich meal is highlighted.[1] The blood sugar level, blood sugar concentration, or blood glucose level is the amount of glucose present in the blood of humans and other animals. Glucose is a simple sugar and approximately 4 grams of glucose are present in the blood of humans at all times.[2] The body tightly regulates blood glucose levels as a part of metabolic homeostasis.[2] Glucose is stored in skeletal muscle and liver cells in the form of glycogen;[2] in fasted individuals, blood glucose is maintained at a constant level at the expense of glycogen stores in the liver and skeletal muscle.[2] In humans, glucose is the primary source of energy, and is critical for normal function, in a number of tissues,[2] particularly the human brain which consumes approximately 60% of blood glucose in fasted, sedentary individuals.[2] Glucose can be transported from the intestines or liver to other tissues in the body via the bloodstream.[2] Cellular glucose uptake is primarily regulated by insulin, a hormone pro Continue reading >>

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Popular Questions

  1. sandy

    Is blood sugar measurement a good indicator of sane eating? After what I think was a very sane meal mine was 113. I was expecting closer to 100.

  2. DrCathy

    Hi, @sandy. It is and it isn't. Normally, your blood sugar goes up for about 2 hours after a meal, when it reaches its peak and then slowly goes down again over the next 2 hours. How high it goes depends on a number of things, including when you check it, your insulin levels and sensitivity, your activity level, and the quality and quantity of food you eat. A blood sugar of 113 after a meal is definitely not abnormal. Unless you're diabetic and need to make decisions about controlling insulin or oral agents, testing your blood sugar is probably not going to be helpful in day to day dietary management. If you've read "The Smarter Science of Slim" and looked at the quick start guides, 7-day meal plan and other resources in the "reader-only resources" in the "Member Area" above, you'll get a good idea of what food is or is not SANE. Actually, that will tell you much more effectively what you should eat than a random after-meal blood sugar measurement.

  3. MooseGeorge

    100 seems a bit low after eating anything. I've always heard it was 70-100 after fasting, and 130-140 after a meal. So your measurement of 113 after a meal sounds like the meal was quite SANE.
    I've always felt the real value in blood sugar measurement was in testing your blood sugar response to specific foods. I suspect each of us has a food that is supposed to be SANE, but for some reason we suspect that maybe it isn't. For example, I get a certain feeling after eating a foods high in sugar, kind of tired and energized at the same time. When I get that feeling unexpectedly I get suspicious of whatever it was I just ate. Testing our blood sugar at these moments can confirm/deny our suspicions.

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