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[who?] 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.
^Freston, Kathy (January 2014). "It's Time For A Healthy, Meatless Option (Please!)". Change.org (Petition). Retrieved 2014-01-31. "We Americans love a protein center to our meal, so veggies and salads alone (or even in a wrap) won’t do the trick; we want something hearty and protein-centric just like the burgers and sandwiches you already have, only with something plant-based instead."
^Jorden, Heather Stewart (1999-07-06). "Charity Scorecard". Los Angeles Times. p. E4. "The event was co-chaired by volunteer Kathy Freston and her husband, Tom Freston, president of MTV Networks."