Learn about the thumb rules to follow when consuming fruit and vegetable juices. Find out why juicing green leafy vegetables may not be healthy and why it's better to eat raw fruits. Avoid mixing fruits and vegetables in juices and be cautious of cold-pressed juices. Also, stay away from packaged juices as they lack vitamins and contain artificial flavor preservatives. Packaged juices can lead to weight gain, high blood glucose levels, and reproductive issues.