Eliminate the sugars and substitute either orange juice concentrate, maple syrup and/or agave. If the peaches are really good, you don't need any sweetening! Use whole grain flour, and then it's great for us who avoid sugar and flour.
Moderator note: Orange juice concentrate adds extra potassium so not a good ideal for people on a low potassium diet. Whole grain flour sounds healthy, but it contains more potassium (488 mg/cup) and phosphorus (466 mg/cup)than refined flour (potassium 234 mg/cup, phosphorus 135 mg/cup). People who are on a low phosphorus and/or low potassium diet may want to stick with refined flour.