Hormonal fluctuations can affect the body’s ability to maintain stable blood sugar levels, so reducing sugar intake is a major component to weight loss and maintenance. But an all-or-nothing approach is not the way to go when it comes to the sweet stuff, says Gibbs. While the women in her study who reduced their sugar intake lost the most weight, and had maintained that loss 4 years after the study began, she’s quick to say that these women reduced their sugar intake—they didn’t eliminate it altogether, which is a tough habit to keep up with (and can lead to binges). Refined sugars, like those in cookies and cakes, are the ones you should reduce. Keep the natural sugars that are found in fruit as your main source of sweetness.