Your fasting
sugar has improved significantly from 144 to 115 mg/dL with dietary changes, which is a VERY GOOD SIGN. However, 115 mg/dL is still slightly above the normal fasting range (<100 mg/dL).
Regular physical activity can definitely help improve insulin sensitivity and bring fasting glucose closer to the normal range. Aim for at least 150 minutes of moderate exercise per week, starting gradually if you are currently inactive.
Whether your fasting sugar reaches the 100 or below range depends on factors such as body weight, diet, genetics, sleep and insulin resistance, so I wouldn't promise that exercise alone will normalize it. The GOOD NEWS is that early lifestyle intervention can significantly reduce the risk of progressing to
diabetes.
Next Steps
Check
HbA1c + repeat fasting plasma glucose. If HbA1c is in the prediabetes range, continue structured diet, weight management and regular exercise and monitor periodically. If HbA1c or repeat fasting glucose confirms
diabetes, consult a physician for further management.
Health Tips
Don't drastically restrict food just to lower the fasting number. Focus on sustainable calorie control, adequate protein/fibre, reducing refined carbohydrates and adding regular physical activity.