If you’re trying to eat healthy, you probably don’t go a day without thinking about sugar. Avoiding sugar is hard because it’s in most foods.

Luckily, there’s no reason to cut sugar out completely. The key, says wellness dietitian Lindsey Wohlford, is to know the difference between natural and refined sugars – and recognize how they impact your body.

“Natural sugar is naturally occurring in food. Think of the sugar that's...