Identifying simple strategies to prevent or delay age-related

diseases is a major public health concern.

But how could you measure the effects of such strategies?

Well, telomere length is a reliable hallmark of biological aging

and the risk of developing age-related chronic diseases.

For those of you who missed all my telomere videos --

which date back over a decade -- what is a telomere,

and why does it matter how long they are?

Telomere comes from the Greek for "end" "part" of our chromosomes.

Telomeres cap the ends of our chromosomes

like shoelace tips to essentially keep our DNA from fraying.

Telomere length is important since there's a minimum length required,

but every time our cells divide, a bit of the telomere is lost

and once they get too short, the cell can die.

That's why telomeres are sometimes called the molecular clock of cells.

Every year they get shorter and shorter, kind of like life's fuse,

but in some people that fuse burns faster than in others.

Accelerated telomere shortening has been identified as a key biomarker

for accelerated aging, disease risk, and diminished longevity.

But there's some good news.

Telomere shortening can be counteracted by an enzyme

in our cells called telomerase.

Telomerase can replenish the lost bits and elongate our telomeres.

So how can we boost this enzyme to, in effect, reverse cellular aging?

Exercise may help. Those with high levels

of physical activity have longer telomeres,

whereas obese individuals and smokers tend to have shorter telomeres,

along with those getting inadequate sleep.

But what about nutrition?

Globally, we might expect that any antioxidant or anti-inflammatory diet

could be protective for telomeres.

So we're talking like a whole food plant-based diet

with a reduced intake of meat and, in fact, swapping out animal protein

in general in favor of plant-based proteins.

Given that plant-based foods have well-known antioxidant

and anti-inflammatory effects, there are fair grounds to believe

that the consumption of plant-based foods

can help to counteract telomere attrition,

but you don't know if it actually would, until you put it to the test.

Dr. Dean Ornish, along with the Nobel laureate

who co-discovered the telomerase enzyme,

studied the effects of comprehensive lifestyle changes

on telomerase activity and telomere length

using the same plant-based diet and lifestyle program

shown to reverse the progression of heart disease and

early-stage prostate cancer, and maybe even early-stage Alzheimer's.

And telomere length shortened in the control group,

and they aged five years as expected,

but didn't just not shorten as much or hold steady,

but actually lengthened in the plant-based lifestyle group.

Whereas in a similar study across a similar time frame,

there was no difference in telomere length when just giving

people the more typical low-fat dairy, skinless chicken breast,

generic-type healthier dietary advice.

Antioxidant-rich plant foods help maintain telomere length.

In contrast, total and saturated fat intake and consumption

of refined flour grains, meat and meat products,

and soda relate to shorter telomeres.

People eating more anti-inflammatory diets

tend to have longer telomeres,

and the greater the anti-inflammatory potential of the diet over time,

the greater potential to significantly slow down

the rate of telomere shortening.

Those with the most pro-inflammatory diets

had almost twice the risk of accelerated telomere shortening.

The most pro-inflammatory food component is saturated fat,

found in meat, dairy, eggs and junk, along with other pro-inflammatory

food components like cholesterol and trans fat.

Omega-3's tend to be anti-inflammatory,

but when put to the test, fish oil supplements

failed to have any significant telomere effects.

The most anti-inflammatory food component is fiber.

And indeed, if you look at dietary fiber intake and telomere length

in a representative sampling of thousands of US adults,

even though nobody was eating enough,

the more fiber people consumed,

the longer their telomeres tended to be.

Since there appeared to be a straight-line increase,

they could do the math,

and it appeared that just a 10-gram increase in fiber per 1000 calories

would equate to four fewer years of biologic aging,

whereas, for example, the consumption of soda

appeared to increase cell aging

by almost two years per daily serving.

Now, of course, diets high in fiber and diets with significant amounts

of fruits, vegetables, and whole grains go hand in hand.

So fiber may just be a marker

for eating lots of whole healthy plant foods,

but are there any specific plants associated with telomere lengthening?

We'll find out next.