Why do blood sugar levels rise even when a person avoids sugar and carbohydrates? “In people with insulin resistance or long-term diabetes, the liver keeps producing glucose, even when no carbohydrates are consumed. This internal production can keep blood sugar readings high, despite strict dietary control,” said Dr Ghody. DISCLAIMER: This article is based on information from the public domain and/or the experts we spoke to. Always consult your health practitioner before starting any routine.