(MENTAL FLOSS) -- Most of the world seems to think that America invented obesity sometime in the last century, but the truth is, fat has always been a part of life (witness Hatshepsut, one of the great ancient Egyptian queens who reigned in the 15th century BC -- despite her svelte sarcophagus, modern archeologists believe that she was pretty obese and may have suffered from diabetes).

Goldfish may have delivered a dubious dietary aid -- tapeworms.

So it stands to reason that dieting has been around just as long.

Some historians credit William the Conqueror with starting the first fad diet. Having grown too fat to ride his horse, William went on a liquid diet in 1087 -- or, rather, a liquor diet, since all he did was drink booze.

The story might be apocryphal -- William, still fat, actually died after falling from his horse and there was no word on whether he was drunk at the time -- but it's a good one, and it sets the tone for the next 1000+ years of dieting.

Throughout history, people have been looking for some kind of magic that will allow one to eat and live as one pleases, but still look emaciatedly gorgeous. And they've come up with some pretty dubious theories that somehow took hold in the public consciousness and became fads. Here are a few of our favorites.

Location, location, location

"The Causes and Effects of Corpulence" was a treatise penned in 1727 by one Thomas Short, in which he observed that larger people were more likely to live near swampy areas. His advice? Fat people should move to more arid climes.

Improbable side effects

The namesake of the graham cracker -- ironically now an integral part of that deliciously fattening treat, the 'smore -- was a Presbyterian minister who claimed that overeating could not only make you fat, it could make you lecherous, too. In the 1830s, Sylvester Graham ran health retreats for like-minded parishioners featuring a strict meat-free, incredibly bland diet.

Chew yourself thin

Horace Fletcher, a turn of the century San Francisco art dealer, became known as the Great Masticator after he claimed he lost more than 40 pounds by chewing his food until it was essentially liquefied and spitting out all the bits that weren't.

Fletcher's scheme became incredibly popular -- novelist Henry James and industry titan John D. Rockefeller were reportedly fans, as was John Harvey Kellogg. Kellogg, of the cereal fame, was a health nut who ran a sanitarium in Michigan, where he encouraged his visitors to "Fletcherize" with a little song he wrote called "Chew Chew." Mental Floss: How cereal transformed American culture

The parasite diet

In the early part of the 20th century, the weight loss industry allegedly found a tiny little helper in the form of a tiny little parasite -- the noble tapeworm. According to product advertisements of the day, tapeworms were being sold in pill form as a weight loss tool.

While whether or not those pills actually contained a real live tapeworm is certainly debatable, however, there is evidence that jockeys, who frequently needed to lose a lot of weight fast, would try to induce tapeworms. Another favorite weight loss tool of the Lilliputian equestrians: Burying themselves in piles of horse manure, which acted as a kind of natural sauna.

Introducing the calorie

In 1918, Dr. Lulu Hunt Peters introduced a new word to the world lexicon --"calorie" (may she be forever cursed for it). Peters' book, "Diet and Health, With a Key to Calories," which helpfully included a phonetic spelling of the word "calorie," as so many people were unfamiliar with it, sold more than 2 million copies and established calorie-counting as the framework of a good health.

This diet regime wasn't particularly dubious, but it did lend a potentially dangerous new tool to those looking for a way to quantify and reduce their food intake. Case in point: The Scarsdale Diet of 1979, a strict 700-calorie a day diet that works -- because you're starving. Mental Floss: Quiz: Which item has
In what century were pills with tapeworms sold for weight loss? What type of worms were in the pills? What kind of diet was William on? What killed William? Pills containing what were marketed as a diet aid? What parasites did people used to use to try to lose weight? How did William the Conqueror die? Where did people used to try to live in order to lose weight?
20th tapeworms liquid died after falling from his horse tapeworm. tapeworms falling from his horse more arid climes.
question: In what century were pills with tapeworms sold for weight loss?, answer: 20th | question: What type of worms were in the pills?, answer: tapeworms | question: What kind of diet was William on?, answer: liquid | question: What killed William?, answer: died after falling from his horse | question: Pills containing what were marketed as a diet aid?, answer: tapeworm. | question: What parasites did people used to use to try to lose weight?, answer: tapeworms | question: How did William the Conqueror die?, answer: falling from his horse | question: Where did people used to try to live in order to lose weight?, answer: more arid climes.