Who does not enjoy the flavourful fruit juices? However if you if you are watching your weight you need to ensure that your juicing habits do not lead to a significant calorie intake. Low in fat fruit juices are high in sugar that can increase the risk of diabetes. It is true that fruit juices contain a healthful amount of vitamins and minerals but are you getting those nutrients at a high-calorie cost? To give you an insight here are the calorie counts of fruit juices. Orange juice: 1 glass = 42.6 cal Lemon juice: 1 glass = 53.7 cal