He told NPR "I was a maniac. I was a psycho. Had these headaches all the day, couldn't stand the pain. All from sugar, sugar, sugar."
This all changed for LaLanne when, at age 15, he attended a lecture given by a health nutritionist who believed in exercise and a healthy diet. The next day LaLanne "stopped eating sugar, became a vegetarian and joined the YMCA in Berkeley, California."
LaLanne quit the sugar and never missed a workout since! NPR reports:
LaLanne hasn't had a sugary dessert or missed a daily workout since 1930. On some birthdays, he has done stunts like swimming from Alcatraz Island to San Francisco in handcuffs or doing a thousand push-ups in 19 1/2 minutes — impossible standards for most, but the art of Jack LaLanne has always been that he doesn't expect people to be Jack LaLanne. Be yourself, he says. Find the time three or four days a week to get the blood flowing and the muscles working.LaLanne on fitness as a lifestyle:
"It's a lifestyle, it's something you do the rest of your life. How long are you going to keep breathing? How long do you keep eating? You just do it."