Was It Worth It?: How These 10 Famous Diet And Fitness Gurus Died

As consumers of pop culture, it's easy to follow celebrity fad diets and trends as opposed to dedicating ourselves to a regimented, personalized diet plan. Fad diets are called fad diets for a reason: They're here, they fail, and they're gone. Unlike transient dieting trends, there are a few time-tested dieting strategies, championed by famous diet and fitness gurus, that function more as a lifestyle than a fleeting mode of eating or exercising.

Obviously, the gurus we speak of all believed that their method of healthy living was best. In terms of contributing to longevity, however, you'll see that some of the following lifestyles appear to have worked better than others. Click ahead for Was It Worth It?: How These 10 Famous Diet and Fitness Gurus Died.

You may remember Euell Gibbons from a 1974 Grape-Nuts commercial in which he said the cereal "reminds me of wild hickory nuts." Before reaching fame by penning books on foraging, Gibbons, a onetime member of the Communist Party, had worked as a cowboy, a union leafleteer, a boat-builder, a surveyor, a merchant sailor, and later, a professional beachcomber. Often carrying no solid food and no hunting or fishing gear, Gibbons thrived on finding and consuming wild greens, nuts, honey, and seeds. His books provide recipes for casseroles, muffins, salads, and more, all from ingredients found in the wild. He died in 1975 at the age of 64 because of a ruptured aortic aneurysm, but there was plenty of buzz saying that he had poisoned himself while living off of the land. Using Gibbons as evidence, one could say (perhaps too boldly) that the forager lifestyle isn't necessarily one that guarantees longevity.

With unofficial titles like "the godfather of fitness" and the "first fitness superhero," there's no way of denying the fact that Jack LaLanne knew a thing or two about exercise and nutrition. Born in September 1914, LaLanne opened one of America's first fitness-based gyms at the age of 21. He invented many exercise machines that are commonplace in gyms today (e.g. pulley systems and leg extension machines), and he advocated for both women and the elderly to start exercising. LaLanne's personal diet varied from three meals of meat, vegetables, and fruit daily to a pescetarian lifestyle and even vegetarianism. He avoided all manmade and processed foods as well as coffee, ate plenty of eggs, and regularly supplemented his diet with vitamins. His diet and exercise regimen were undeniably successful: At 54 years old, LaLanne beat then-21-year-old Arnold Schwarzenegger in an exercise competition. He also lived to be 96 years old, dying of pneumonia-based respiratory failure in 2011. If you're looking for a guru-inspired longevity recipe, the LaLanne plan could be for you.

At the young age of 35 years old, Jim Fixx was unhappy with his 240-pound frame and his two-pack-a-day smoking habit. He decided to quit smoking and to get in shape by running and, by the time of his death (at 52), Fixx had successfully turned his life around and become a verifiable running guru. He changed his lifestyle after picking up the sport, and he even authored a best-selling book called The Complete Book of Running. While running up to 80 miles a week and appearing to be in incredible physical condition, Jim Fixx continually ate fast and junk foods and is rumored to have often consumed excess amounts of sugar. After having gone out on a run one day in 1984, Fixx was found dead. His autopsy revealed large amounts of plaque buildup in his arteries, leading to speculation that no matter how much exercise one does, nothing can make up for years and years of smoking and eating poorly.

The Montignac diet, a predecessor of the more widely known South Beach Diet, is a diet that was originally designed to help its creator, Michel Montignac, lose some weight. Montignac, a French nutritional advocate and author, suggested that one didn't need to reduce calories to lose weight. Rather, he suggested a non-restrictive diet, focusing on the glycemic index (separating unhealthy bad carbs from healthier good carbs) and using it to work in your weight's favor. His diet stores sold such foods as chocolate, foie gras, beef, and cheese — foods that contain very few of what Montignac labeled as bad carbohydrates. He died at the age of 66 in 2010 of prostate cancer, a form of cancer that hasn't been concretely linked to diet.

If you haven't heard of the Atkins Diet, you've been living under a rock (probably made from hardened, unused bread) for the past few decades. The diet, created by physician and cardiologist Robert Coleman Atkins, was inspired by a suggestion its creator received from one Dr. Alfred W. Pennington. In 1963, Dr. Pennington told Atkins (who had recently gained a good amount of weight due to poor eating and stress) to remove all starch and sugar from his diet. Atkins took this advice and turned it into a global dieting enterprise, making his money from producing books, meal plans, and actual foods that promote his ketogenic dieting style. The death of Robert Atkins is a curious one: He died at the age of 72 in 2003 from what was reported to be a blunt impact injury of the head after having slipped and fallen. When he was admitted to the hospital, he weighed roughly 195 pounds. At the time of his death (after being in a coma for nine days), Atkins reportedly had gained an astonishing (and almost unbelievable) 63 pounds (totaling 258 pounds) from water retention, and it was discovered that he had a history of congestive heart failure, heart attack, and hypertension. There's still debate as to what really killed the man.