A low-glycemic index (low-GI) diet is a meal plan focused on how foods impact blood sugar levels, also known as blood glucose levels. The glycemic index ranks foods on a scale from 0 to 100.

But what is a slow-carb meal plan ... You get one "free day" per week on which you can eat whatever you want, Zeitlin says. “The idea is to follow a very low-carb regimen on the premise that ...