We cannot survive without food, the main source of energy required for proper functioning of our cells. Energy is mainly stored in our bodies in the form of sugars (i.e. glucose, fructose), but also proteins and fatty acids. Glucose, a basic type of sugar, is indispensable to producing ATP, the energy currency that is used as a fuel in most biological processes, including in the division of our cells. We need glucose to function. On the other hand, blood levels of glucose must be tightly controlled. Glucose blood levels that are too high, or too low, can cause a range of health issues, including blood vessel destruction which when it occurs within the eye can lead to blindness. And of course, prolonged hyperglycemia is defined as diabetes, a disease also known as a "silent killer"
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