Energizes You and Enhances Your Mood. The energy a human receives from food comes from the atoms and molecules in your food. A reaction occurs when the positive charged ions from food enter the digestive tract and interact with the negative charged enzymes. Lemon is one of the few foods that contain more negative charged ions, providing your body with more energy when it enters the digestive tract. The scent of lemon also has mood enhancing and energizing properties. The smell of lemon juice can brighten your mood and help clear your mind. Lemon can also help reduce anxiety and depression.