A glucose level of 400 is very high. Symptoms of diabetes are the acute effects of high glucose, like drinking lost of water, passing lots of urine, tiredness, and blurred vision. If a patient has had glucose for a while, then they may have adjusted to the levels, and therefore don't always feel the symptoms.HOWEVER, the complications of diabetes are related to how high the glucose levels are, and for how long they are raised.These complications are heart problems(heart attacks, heart failure), strokes, circulation problems, nerve, eye and kidney problems. A level of 400 is therefore not acceptable and must be lowered to a level determined by his doctor. Diabetes is one of the silent killers, and patients can feel fine while high glucose levels are damaging their body
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