Reason behind Indian ancestors stressing to start with spicy and end with sweets

Spicy food! It is well known that when we take spicy foods the body secretes digestive juices and acids which enhance the digestive process.

Sweet food! Sweets contain a lot of carbohydrates which make for sluggish digestion.

Also, the intake of sugar enhances the absorption of amino acids tryptophan.

Tryptophan

Tryptophan increases the levels of serotonin a neurotransmitter associated with the feelings of well-being. That is the feeling that we experience at the end of a full meal.