My Experience:
2 years back I was detected Pre-diabetic. Cut down consumption of white sugar to zero. Cut down on any food that has White Sugar in it (Biscuits, Ice Cream, Desserts, cold drinks, etc.). Became conscious of reading ingedrients/Contain's part when I buy any packed food.
Developed habit of walking 8K steps or burning 150Kcal after dinner. My glycemic levels are now normal. I am no longer a pre-diabetic. This can be managed with active lifestyle. White sugar is a poison. Rely on Fruits to fulfill the glucose levels of your body.
PS: After 2 years I've started consuming food having white sugar occasionally ( on Diwali or Holi and that too in limits). Never restricted myself from consuming naturally sweet fruits (Banana, Mango, Apple, etc.).