Diet help please

So I am needing to lose some weight. I’m 5’ 8” and 198 pounds. I went and had some labs done and my blood sugar was at a 99. Which if it goes up with 100 it is pre diabetic. My family has a big history of diabetics both sides. Sense I got that I have switched to drinking mainly water and tried to cut out most unhealthy foods. I have a two year old so I am trying the best I can to get my sugar back to a normal level. How much weight should I lose to be in the clear? Has anyone else struggled with this?