New Delhi: The sattvic diet traces back to its roots in ancient Ayurvedic knowledge and is based on the philosophy of Sattva, which stands for harmony, balance, and purity. It places a focus on whole, fresh, and minimally processed meals that support both physical and mental vigour. This "yoga of eating" becomes a biological requirement for preserving homeostasis in the intense summer heat.Dr. Narendra K. Shetty, Chief Wellness Officer, Kshemavana Naturopathy and Yoga Center, Bengaluru, in an interview with Health and Me, spoke about the science behind following a sattvic diet in summer.Core principles of sattvic foodsIn sattvic diets, foods that are rich in prana (life-force energy), such as seasonal fruits and vegetables, grains, nuts, and seeds, take precedence. "Tamasic" (heavy) foods such as meat and processed sugars should be avoided, as they can weigh the body down and dull the mind. "Rajasic" (stimulating) foods such as caffeine and chili are also avoided.Read more: Smartphone Overuse Linked To Rising Risk Of Eating Disorders Among Youth, Study FindsScientific basis of nutrition and digestion in summerAccording to science, the body's internal thermostat works harder in the summer. Agni (digestive fire) naturally decreases in high ambient temperatures. In order to promote cooling through perspiration, blood flow is frequently redirected from the digestive tract towards the skin's surface. The body struggles to break down dense nutrients with decreased enzymatic efficiency when complex, heavy proteins are consumed during this period, leading to metabolic stress.Summer physiology: Why light eating mattersA shift towards thermoregulation is required during summer. Heavy meals cause diet-induced thermogenesis, in which heat is produced internally during digestion. By consuming "light" foods, we lower this internal heat load. Because sattvic meals are high in fibre and water, they require less energy to digest, allowing the body to focus on staying cool rather than working on digestion.Read more: Shocking! Eating One Whole Pack Of Chips Daily Raises Stroke Risk By 67 Per CentSattvic diet benefits in hot weatherHydration: Electrolyte balance is maintained due to naturally high water content.Energy: Provides a steady release of glucose without the "crash" caused by heavy fats.Mental calm: Reduces agitation and fatigue brought on by heat.Key sattvic foods for summerTo remain "bright," one should focus on the following:Cooling fruits like grapes, watermelon, and muskmelonHydrating vegetables like cucumber, zucchini, and bottle gourdHerbs and dairy: fresh buttermilk (chaas), coriander, and mintEating light is not just a lifestyle choice but a scientific response to our biological needs. By adopting a sattvic perspective, we ensure that we not only survive but also thrive in the heat by aligning our internal environment with the external season.