Is blood sugar in the 180-220 range bad?
A blood sugar reading of more than 180 mg/dL or any reading above your target range is too high. A blood sugar reading of 300 mg/dL or more can be dangerous. If you have 2 readings in a row of 300 or more, call your doctor.
Exact cause is unknown but most appreciated hypothesis is either low insulin or insulin resistance due to genetic +/- environmental factors. Increased risk of Heart attack/ Angina/ Stroke, Nerve damage, Kidney damage, Gastroparesis (Nausea/ vomiting) Diarrhea or constipation, Eye damage - blindness, Increased risk of cataract and glaucoma, Foot damage/ amputations, Skin infections, Increased risk of Alzheimer's disease/ Depression/ Hearing impairment.
With time, raised blood sugar levels can damage the blood vessels and nerves that control the heart. Additionally, people with diabetes are also more likely to have other conditions that raise the risk for heart disease/ stroke such as high blood pressure and deranged cholesterol or triglyceride levels.
Physical exercise lowers blood glucose levels and blood pressure, improves blood flow, burns extra calories so you can keep your weight down if needed, improves your mood, can prevent falls and improve memory in older adults, may help you sleep better. Start exercising after speaking to a doctor, start slowly and increase.
There's no particular timeline that stands true for all patients, it depends on many factors such as age of diabetes onset, control of blood sugars, lifestyle and regular check ups.