We're not saying you need to quit your favourite healthy morning muffin or post-lunch dessert; we're just saying you need to watch your sugar intake. "Every healthy lifestyle includes indulgences, but if you are trying to lose weight, indulging in your favourite treat every day may have you taking in too much sugar to meet your goals," said Zeitlin. "Instead, choose to have one ounce of dark chocolate on a daily basis, and keep larger treats to just one or two times a week."