Research has shown a link between digestion and your body’s natural fluctuations throughout the day. In the morning, your body prepares for the day by activating your digestive system, which can intensify symptoms and your body's response to food.Research has shown a link between digestion and your body’s natural fluctuations throughout the day. In the morning, your body prepares for the day by activating your digestive system, which can intensify symptoms and your body's response to food.