Whether or not he lets himself be persuaded to run for president, Chris Christie needs to find some way to lose weight. Like everyone else, elected officials perform best when they are in optimal health. Christie obviously is not.

You could argue that this is none of my business, but I disagree. Christie’s problem with weight ceased being a private matter when he stepped into the public arena — and it’s not something you can fail to notice. Obesity is a national epidemic whose costs are measured not just in dollars and cents but also in lives. Christie’s weight is as legitimate an issue as the smoking habit that President Obama says he has finally kicked.

Eugene Robinson writes a twice-a-week column on politics and culture, contributes to the PostPartisan blog, and hosts a weekly online chat with readers. In a three-decade career at The Post, Robinson has been city hall reporter, city editor, foreign correspondent in Buenos Aires and London, foreign editor, and assistant managing editor in charge of the paper’s Style section. View Archive

On rare occasions, Christie speaks candidly about his weight. “I’m really struggling, been struggling for a long time with it,” he told CNN’s Piers Morgan in June. “And I know that it would be better for my kids if I got it more under control, and so I do feel a sense of guilt at times about that.”

Six weeks later, the New Jersey governor was briefly hospitalized for asthma — a condition that he has had for most of his life. Researchers say that many respiratory problems, including asthma, are worsened by obesity.

As he left the hospital, Christie acknowledged the connection. He described himself as “relatively healthy by all objective indicators,” but added that “if I weighed less, I’d be healthier.”

“The weight exacerbates everything,” he said.

And it does. According to the National Institutes of Health, obesity puts people at greater risk for Type 2 diabetes, coronary heart disease and stroke, certain types of cancer, sleep apnea, osteoarthritis, and gallbladder and liver disease.

The NIH estimates that nearly 34 percent of U.S. adults can be classified as “obese,” meaning they have a body mass index of more than 30. By this standard, a man who stands 5-foot-11 — Christie’s reported height — would be obese if his weight reached 215 pounds. While Christie does not disclose his weight, it appears to exceed the 286 pounds that would place him among the 5.7 percent of American adults whom NIH classifies as “extremely obese.”

I refer to obesity as an epidemic because the percentage of obese adults has doubled in the past 40 years — and childhood obesity is increasing even more rapidly. Again according to the NIH, “obesity is associated with over 112,000 excess deaths due to cardiovascular disease, over 15,000 excess deaths due to cancer, and over 35,000 excess deaths due to non-cancer, non-cardiovascular disease causes per year.”

On average, health-care costs for obese persons are 42 percent higher than costs for individuals whose weight falls into the “normal” range. It costs Medicare $1,723 more a year for an obese beneficiary than a non-obese one. For Medicaid the differential is $1,021, and for private insurers it’s $1,140. In other words, obesity is helping propel the rise in health-care costs, which are fueling the long-term rise in the national debt.

My intention is not to blame Christie for the federal government’s deficit spending — or, in fact, to blame him for his own obesity. Blame is not the point. Christie is just 49 and has four young children; politics aside, I’m sure he wants to be around to share the milestones in their lives. He prides himself on bullheaded determination and speaks often about the need for officials to display leadership. Well, Gov. Christie, lead thyself.

“I weigh too much because I eat too much,” he said after his hospitalization this summer, “and I eat some bad things, too.”

If only it were that simple. Yes, the basic arithmetic of calories ingested vs. calories expended is inescapable. But the science of weight control now takes into account the role that genetics might play, along with psychological factors that lie outside our conscious control. There are new options, including gastric surgery, beyond the dieting roller coaster — lose 40 pounds, gain it all back — that Christie says he has been riding for years.

Those who have lost weight and kept it off for extended periods, including former Arkansas governor Mike Huckabee, say they have succeeded by making proper diet and exercise part of their lives — not just unpleasant chores that have to be endured.

Politically, I disagree with Christie on almost everything. I’ll have plenty of opportunities to tell him why. Today, I’d just like to offer him a bit of unsolicited, nonpartisan, sincere advice: Eat a salad and take a walk.

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