Freston grew up in the Atlanta area. She began modeling at age 16.
Kathy Freston is the New York Times bestselling author of The Lean: A Revolutionary (and Simple!) 30-Day Plan for Healthy, Lasting Weight Loss, Veganist: Lose Weight, Get Healthy, Change the World, The Quantum Wellness Cleanse: The 21 Day Essential Guide to Healing Your Body, Mind, and Spirit, and Quantum Wellness: A Practical and Spiritual Guide to Health and Happiness. Freston has appeared frequently on national television, including Ellen, The Dr.Oz Show, Charlie Rose, Good Morning America, The Talk, The Martha Stewart Show, Extra and Oprah.
Freston is the author of a free daily newsletter, The Daily Lean.
She has appeared on The Oprah Winfrey Show and across Winfrey's network. Freston was responsible for a 21-day vegan detox plan which Winfrey tried in 2008. Evangelical Christians have been critical of Freston's teachings.
Her work has been featured in the magazines Vanity Fair, Harper’s Bazaar, Self, W, and Fitness. She is also a regular contributor to the Huffington Post.