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The flat line is the optimal blood sugar level (i.e. the homeostatic set point). Blood sugar levels are balanced by the tug-of-war between 2 functionally opposite hormones, glucagon and insulin. Blood sugar levels are regulated by negative feedback in order to keep the body in balance.
The brain also uses glucose during starvation, but most of the body's glucose is allocated to the skeletal muscles and red blood cells. The cost of the brain using too much glucose is muscle loss. If the brain and muscles relied entirely on glucose, the body would lose 50% of its nitrogen content in 8–10 days. [13]
In a healthy adult male of 75 kg (165 lb) with a blood volume of 5 L, a blood glucose level of 5.5 mmol/L (100 mg/dL) amounts to 5 g, equivalent to about a teaspoonful of sugar. [14] Part of the reason why this amount is so small is that, to maintain an influx of glucose into cells, enzymes modify glucose by adding phosphate or other groups to it.
GLUT4 has a Km value for glucose of about 5 mM, which as stated above is the normal blood glucose level in healthy individuals. GLUT4 is the most abundant glucose transporter in skeletal muscle and is thus considered to be rate limiting for glucose uptake and metabolism in resting muscles. [ 8 ]
On the flip side, a diet high in added sugar, refined carbs, and saturated fat increases blood sugar and worsens insulin resistance, in turn, leading to type 2 diabetes, adds Palinski-Wade.
ShutterstockThe average American consumes 17 teaspoons of sugar a day, but the Dietary Guidelines for Americans 2020–2025 recommends thatAmericans keep their intake of added sugars to less than ...