Nutrition advice has always had fashions.

In the 1990s, we were told to eat high-carbohydrate diets. Fat was the enemy.

Then carbohydrates became the enemy. Fat made a comeback. Keto had its moment.

Today, protein is having a very good decade. I’ve subscribed to all of them at some point in time.

Now I’m hearing a new one.

“Fiber is the new protein.”

I’m not sure that’s right.

Protein deserves its popularity.

As we age, preserving muscle matters. Protein helps maintain lean body mass, improves satiety, and can make weight loss easier.

That’s good news for almost every man over fifty.

This isn’t an article against protein.

It’s an article in defense of fiber.

The problem is that fiber has terrible marketing.

Nobody posts their bowl of oatmeal on Instagram. Nobody worries about getting enough psyllium after leg day.

Protein is sexy.

Fiber is dependable.

If you’re wondering whether I’m about to tell you that a glass of orange fiber sludge is going to improve your erections, I’m not.

I don’t think the evidence lets me say that.

But I also wouldn’t tell you to ignore fiber if your goal is staying healthy enough to enjoy a good sex life for years to come.

The penis doesn’t get its own cardiovascular system.

The same blood vessels affected by cholesterol, diabetes, insulin resistance, and excess visceral fat are the ones responsible for erections.

That’s one reason erectile dysfunction can be an early sign of cardiovascular disease.

Fiber quietly helps many of those same systems.

Diets higher in fiber are associated with better cholesterol, improved blood sugar control, healthier body weight, and lower cardiovascular risk.

That’s not an erectile dysfunction treatment.

It’s simply taking better care of the body responsible for one.

The good news is that this isn’t a competition.

Most men would benefit from both.

Enough protein to preserve muscle.

Enough fiber to support metabolic and cardiovascular health.

One builds the engine.

The other helps protect it.

Maybe fiber isn’t the new protein.

Maybe it never needed to be.

Protein will keep getting the headlines.

Fiber will quietly keep doing its job.

And if that means healthier arteries, better poop, and fewer reasons to see both your cardiologist and your urologist, I’d say that’s a pretty good day’s work.