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When the federal government’s 1980 “Dietary Guidelines for Americans” warned about the baleful effects of saturated fats, public interest activists managed to persuade major food companies to switch to the shiny new alternative: trans fats. Thirty-five years later, the Food and Drug Administration determined that trans fats are not just useless but unsafe, and ordered them removed from all foods. Oops.

So much for settled science. To tell the truth, I never paid much attention to the fat fights. From my days as a medical student (and prodigious consumer of junk food), I’ve seen so many “findings” come and go that I decided long ago to ignore — and outlive — them all.

So far, I’m ahead. Never had an egg substitute. I figured trans fats were just another fad waiting to be renounced. And if I was wrong, the green eggs and ham would take so long to kill me anyway that I was more likely to be hit by a bus first.

Don’t get me wrong. I don’t advocate this kind of fatalism for everyone. I do, however, preach skepticism. Remember that most venerable piece of received medical wisdom — 98.6 degrees as the average adult human temperature? In 1992, three researchers bothered to measure — and found that the conventional wisdom (based on an 1878 German study) was wrong. Normal is 98.2.

After that — 114 years of error — one is inclined to embrace Woody Allen’s “Sleeper” theory that in 200 years we’ll discover that smoking is good for you, fruits are not. I still love peaches, but I eat them for the taste not because they might add a month to my life (in the ICU when I’m 90).

And there are always new windmills to be tilted at. The latest is gluten.

Now, if you suffer from celiac disease, you need a gluten-free diet. How many of us is that? Less than 1 percent. And yet supermarket shelves are groaning with products proclaiming their gluten-freedom. Sales are going through the roof.

Another crock. Turns out, according to a massive Australian study of 3,200 products, gluten-free is useless. “The foods can be significantly more expensive and are very trendy to eat,” says Jason Wu, the principal investigator. “But we discovered a negligible difference when looking at their overall nutrition.”

Told you so.

Why then am I not agitating to have this junk taken off the shelves? Placebos. For which I have an undying respect, acquired during my early years as a general-hospital psychiatrist. If you believe in the curative powers of something — often encouraged by the authority of your physician — a sugar pill or a glass of plain water can produce remarkable symptom relief. I’ve seen it. I’ve done it.

So I’d never mess with it. If a placebo can alleviate your pain, that’s better than opioids. If going gluten-free gives a spring to your step, why not? But please, let the civility go both ways. Let the virtuous Fitbit foodie, all omega-3’d and gluten-free, drop the self-congratulatory smugness. And I promise not to say it’s all in his head.

Live and let eat. Happy New Year.

Charles Krauthammer writes for the Washington Post.

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