Agni, or digestive fire, is responsible for our digestion of food, emotions and experiences in life. Just like a fire, agni needs to be tended. When left to smolder or allowed to grow too strong, it will result in indigestion, symptoms of imbalance and eventually disease.
When agni is balanced, digestive fire is stronger in the cooler months and weaker when the weather is hot. This allows you to take in heavier foods in the winter so you can maintain a protective layer of tissue to stay warm. Whereas in the summer, you may be drawn to eat lighter meals.