Avoid all fruit and carrot juices. Whole fruit such as apple is acceptable.
Never, consume high glycemic fruits and foods without a source of protein and fat to balance them. For example, you can eat a combination consisting of a whole fruit with some almond butter to balance the carbohydrate with protein and fat.
Dr. James L. Wilson, excerpted from "Adrenal Fatigue: The 21st Century Stress Syndrome":
People with adrenal fatigue and blood Sugar problems should go lightly on fruits, especially in the morning. But if you exercise early in the day, it may be possible for you to handle a small amount of fruit for breakfast. Exercise elevates cortisol and aldosterone levels, which in turn raise sodium levels in your blood, allowing for greater tolerance to the effects of fruit. However, be very careful of fruit consumption and if you notice that you become more tired, thick headed or start to experience other symptoms of either low blood Sugar or low adrenals, then eliminate fruit in the morning."