Ashtanga Hridayam, Sutrasthana 3.5
Grishme ushna vata: pittam pravarddhate — In summer, hot wind increases and Pitta accumulates. Bala Kshaya and Deha Shoshana occur progressively through the season.

Classical summer regimen

Diet

Sweet, cool, liquid-dominant

Sweet, cold, liquid, and oily foods. Rice with milk, cooling dairy, sweet fruits, plenty of fluids. Shali Mantha (rice water with cooling herbs) is a classical summer preparation. Avoid: pungent, sour, salty, alcohol, heavy meals.

Exercise

Minimum — gentle only

Not the season for vigorous exercise. Mild walking and gentle Yoga only. Swimming specifically documented as beneficial in Grishma.

Sleep

Afternoon rest permitted

The only season permitting brief daytime rest — nights are short.

Pitta accumulation for autumn
Pitta accumulated silently in summer manifests as Pitta diseases in Sharad (autumn). Summer dietary discipline directly prevents autumn inflammatory conditions.