Cocktails made of fruit and milk, buttermilk, kefir or yogurt are a great snack, also for people who watch their weight. A mixed sweet banana, accompanied by sour strawberries or kiwi is the best basis for this healthy drink. It will be quite impressive if served with the addition of dark fruits - berries, blueberries and black currants, which color the drink purple. If you do not add too much sugar, such chilled cocktails will be low-calorie, but also a filling afternoon tea or lunch.