We get our energy from the food we eat which is where sugar and carbs is derived from. The body breaks down starches and carbs into simple sugars and it is distributed to our organs as fuel to perform daily functions. The body does stock pile a reserve of glucose and fructose in the liver in the form of glycogen which it releases when it needs it. Glucose and or fructose is also stored in the muscle. So as far as where it comes from within the human body, its the storages in the liver and muscle but those storages are built up from the food we eat.
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Fructose is a simple sugar found in fruits and vegetables. It is also one component of cane sugar and is found in many other types of caloric sweeteners including honey, fruit juice concentrates, agave nectar and high fructose corn syrup.
Fructose is a natural component of foods that we should consume regularly. As an added sugar (or part of an added sugar) it can be consumed as part of a balanced diet.
Only when it's extracted and concentrated as a food sweetener (then it's VERY bad). Fructose is in many fruits and vegetables that are quite good for you.