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Man Loses Weight Eating Nothing But McDonald’s

He makes nutritionists frown, but a man who ate all of his meals at McDonald’s for six months says he’s lighter and healthier as he nears the end of his unconventional weight-loss plan.

John Cisna, a high school science teacher in Colo, Iowa, who gained national attention for his experiment, says he has lost 56 pounds, lowered his cholesterol and lost a total of 21 inches off his chest, waist and hips while dining only at the fast food emporium.

As enthusiastic as Cisna is about the results, even he’s incredulous about what he’s done. He documents his experience, which ends on March 15, in the new book, ”My McDonald’s Diet.”

“It’s kind of scary to realize that in nine days, I’ll have spent half a year of my life eating nothing but McDonald’s,” he told TODAY.

“I’m not bored of the food, but I am missing other foods. I am craving seafood. In fact, my first night when I am done with this, I’m going to have some shrimp and some scallops and some salmon. Maybe some asparagus on a bed of rice pilaf.”

As Cisna first told TODAY in January, he followed a 2,000 calorie diet, using the daily recommended allowances for carbohydrates, proteins, sugar and fat; and he walked 45 minutes a day.

Crash Dieting

I recently returned from a week long vacation where I ate and drank whatever I wanted, whenever I wanted. While it made for a free-spirited break from real life, upon returning home, I find my body feels sluggish and my jeans are a bit tighter than I would prefer. Yikes!

The internet offers no shortage of ways to drop a few pounds fast, but if I don’t return to my daily healthy lifestyle, I know those pounds will creep right back (and probably bring a few friends). Further, so-called “Crash Dieting” (aka Fad Dieting, Yo-Yo Dieting) carries its own host of problems, including:

Slowed metabolism
Weakened immune system
Cardiac stress

In particular, shortages of essential vitamins and nutrients to body can cause tremendous stress, potentially carrying long-term, damaging results. When your body doesn’t get what it needs from food, it will turn inward to find it, potentially pulling nutrients from bones and tissue.

Is it worth it?

Even if you commit to a crash diet for no more than a week or two, there are very few (if any) advantages gained. Namely, the weight you may lose is predominantly water, and will very likely reappear once you return to your normal diet. More importantly, a crash diet throws your body’s metabolism into shock. When you severely restrict your calories and nutrients, your body adapts to functioning on the lesser amounts. When you do return to your normal diet, your body will still be accustomed to functioning on less, typically resulting in weight gain. While your body will eventually adapt back to functioning with more food, it could take weeks or months of weight gain before everything balances.

The Bottom Line

Changing your eating habits is still the number one way to manage your weight, but slow and steady wins this race. Committing to healthy lifestyle choices, specifically a balanced diet and exercise, will ultimately yield greater returns in the long run. Consider losing and maintaining weight is 80% nutrition and 20% exercise – you can have one without the other, but they work best together.

If you’re ready to take a closer look at your nutrition and exercise habits, there are several great online tools to help you track what you eat and how often you move. Take a week or two and start logging using one of these tools. Before too long, you’ll be able to identify which foods are undermining you, and areas for improvement.

Jennifer is a recreational runner living in a Maryland suburb of Washington, DC. She writes about running for health and fitness at Terrapin Crossing.