The sugars found in whole fruit are less likely to be harmful than sugars from fruit juices. Even unsweetened fruit juices can contain a high amount of sugar. Fruit in smoothies also gives a high sugar content, as the fibres are shredded and reduce their positive effect on blood sugar. Stick to varied, fresh, whole fruits if you need a snack. Low fat yoghurts can also be high in sugar, so check the label. Try natural yogurt with banana or nuts added, for a tasty treat.