From Sidhar songs in Tamil. What to eat for breakfast lunch and dinner Eat breakfast like a king, lunch like a queen and dinner like a beggar. This is the wise adage with healthy truth. Digestive power is maximum in the day and decreases as night approaches. Undigested food cause many health problems.
Undigested food stays in the intestines and becomes feed for bacteria and other parasites.
The toxic products these microbes release is absorbed and enters the body and cause many diseases. It's a bad cultural change. With change in life style we eat a heavy dinner which is unhealthy. We are used to one bowel cleansing in the morning. Therefore what we ate for breakfast and lunch comes out next day morning.