Francois Henri LaLanne is born in San Francisco, California, to French immigrant parents, Jeanne and Jean LaLanne. His early life was marked by poor health and a sickly disposition.

LaLanne suffered from numerous health issues, including sugar addiction, headaches, and boils. He described himself as a 'skinny, sugar-holic freak' during this period. He was prone to temper tantrums.

A pivotal moment in LaLanne's life occurs when he attends a lecture by nutritionist Paul Bragg. Bragg's emphasis on whole foods, exercise, and a positive mindset profoundly impacts LaLanne, sparking his dedication to fitness.

Inspired by Bragg, LaLanne embarks on a rigorous self-improvement program. He cuts out sugar and processed foods from his diet and begins weight training and calisthenics. He reports feeling significantly healthier and happier.