Karan Sarin

About Karan

Karan Sarin is a certified metabolic health coach, a two-time startup founder, and the creator of @sweetreactions, a popular Instagram community. After his father’s cardiac arrest and the loss of his brother-in-law, Karan made it his mission to raise awareness of metabolic health—especially its most common form, insulin resistance—among Indians. Through data-driven self-experiments with continuous glucose monitoring, he distills actionable advice for thousands, including doctors and celebrities. Professionally, he has served in management and executive leadership capacities for consumer hardware, foodtech, and eCommerce startups in the US, EU, and India. Notably, he served as the first Chief Marketing Officer of Razorpay. He lives between Berlin and Delhi with his wife and two children. Sick Nation is his first book.