A new study provides evidence for the "fat and happy" phenomenon.

You’ve probably heard the expression “fat and happy” to describe people in long-term relationships.

The idea is pretty simple: Because these individuals are no longer on the dating market, their outward appearance becomes less important. They’ve found a mate, and so they don’t think twice about eating the extra slice of pizza or cake. Eventually, those calories and pounds add up. At least, that’s the theory.

According to Thomas Klein, a German professor who studies the link between happiness and body weight, it’s true. Klein’s researchers studied 2,000 people between the ages of 16 and 55 and found that single people, on average, weighed less than their committed counterparts. Klein concluded: “In a happy partnership, people tend to get fat.”

Researchers also discovered that when one partner abruptly loses weight, it can be an indication that he or she is readying themselves for the dating market – and preparing to end the existing relationship. Of course, this isn’t always the case; a renewed interest in fitness can be influenced by a number of factors.

For me, the takeaway is that many of us need to rethink fitness.

Yes, exercise and nutrition can transform your body in a way that others may find attractive. But the more important reasons to exercise – like increased energy, improved overall health, disease prevention, longevity, better sleep, etc. – run much deeper.

There’s nothing wrong with exercising to look good, but the superficial benefits of exercise pale in comparison to the real ways that it can transform your life.

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