Citrus fruits are little vitamin C bombs and can help us lose weight! A grapefruit, for example, contains only 42 kcal per 100 g and consists of 88% water. As the acidity slows your digestion and saturates your body for a long time, the vitamin boost stimulates your body's ability to burn fat in the morning. Win win! A great way to get your daily dose of citrus fruits is by mixing up a refreshing smoothie. Here are 10 recipes to get you started!