Different digestive enzymes are involved in digesting proteins, carbohydrates, starches, acids, and alkaline fruits. Hence it is not a good to consume all these fruits in one sitting. There are some exceptions in juicing. Avoid mixing acidic fruits, lemons, grapefruits, oranges, etc. with other fruits . It can curdle the other juices in your gastro-intestinal contributing to fermenting of the foods.
Fermentation contributes to flatulence.
Lemons juice is sprinkled over salads. As we all know, visuals are a important component of inducing appetite. In color therapy, colors have different healing properties. In colder weather, red color juices boost digestive fire. In summer, lighter colored juices cool the body.