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Dear Dr. Paster: I’ve read that a person’s biological age is different from their chronological age. I’m a healthy, active 66-year-old man. According one website, I’m actually a younger 55-year-old guy. One side of me says yahoo, but the other side says wait a minute. Is this a scam? What’s up doc?

— Bob the Runner

Dear Runner: The idea that you can turn back the biological clock is as old as Ponce de Leon’s search for the Fountain of Youth. More recently, this concept was popularized by Dr. Michael Roizen, the man behind the popular “RealAge” books and website, and Dr. Mehmet Oz, who co-authored “YOU: The Owner’s Manual” with Roizen. The two also are fellow columnists in WNY Refresh.

The theory is that taking steps to wellness will help you live longer and be healthier. And what better way to sell this than to say you’re really younger? I love the concept.

Bottom line: I think this trick of the trade is the great way to stay fit and think yourself well. Keep running.

Dear Dr. Paster: On your radio show, you talked about taste tests showing that natural peanut butter wasn’t as tasty as Jif and Skippy. But you failed when you didn’t talk about the nutritional differences. Read those labels. The natural stuff contains peanuts and salt, while the big brands contain sugar and other fat. That doesn’t sound healthy to me.

— Peanut Butter Sam

Dear Sam: Thanks for the update. You’re right that those popular kid-friendly peanut butters have hydrogenated fat to keep them emulsified. The natural stuff settles out, while these brands do not. They also add a touch of sugar to perk up the palate, so we’ll buy more.

But if you look at the labels, you’ll find they’re nearly the same nutritionally. All peanut butter, natural or not, is dense in calories, clocking in at about 100 calories per tablespoon. Most of those calories are from fat. The sugar in some brands adds a few calories, but not much.

So I think it’s a matter of taste and choice. And as with all calorie-rich foods, there can be too much of a good thing. Eat wisely.

Dear Dr. Paster: What do you think of Nerium? It’s a product I found on the Internet that claims it will take all those pesky wrinkles off my face. They claim science, but my husband claims scam. What do you claim?

— Jill from Geneva

Dear Jill: Wish it were true, don’t you? When I went to the product’s website, I headed over to check the price. I thought $75 per ounce, about twice the cost of silver, was a bit pricey. But if it takes care of my wrinkles it just might be worth it, right?

Well, then I headed over to the science table and found that their experiments were not even as worthy as some of the science fair projects I’ve judged at my local middle school. So I think I’d save my money for a gym membership.

Dr. Zorba Paster is a family physician, university professor, author and broadcast journalist. He also hosts a popular radio call-in program at 3 p.m. Saturdays on WBFO-FM 88.7.