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B1 متوسط انگلیسی 19:13 Educational

What is the best diet for humans? | Eran Segal | TEDxRuppin

TEDx Talks · 4,178,617 بازدید · اضافه شده 4 روز پیش

آمار یادگیری

B1

سطح CEFR

5/10

سختی

زیرنویس‌ها (304 بخش‌ها)

00:00

Translator: Rhonda Jacobs Reviewer: Leonardo Silva

00:16

This is me ten years ago.

00:19

I weighed 40 pounds more than today,

00:22

and like many people, I wanted to lose weight.

00:26

Like many people, I wanted to know what is the best diet for humans.

00:32

Many of us actually have an opinion about this question.

00:35

Some believe that a low fat, plant-based diet is the best.

00:39

Others, that a low-carb diet,

00:41

rich in protein and animal fat, is the best.

00:44

Others have opinions on how much sugar we should eat,

00:47

or how much salt, cholesterol, saturated fat, eggs or dairy products

00:53

we should have in our diet.

00:56

But the question of what the best diet is,

00:59

is a scientific one,

01:01

so there should be no room for opinions or beliefs.

01:05

If Diet A is really better than Diet B,

01:08

then a study that compares the two on enough people

01:11

should show that definitively.

01:13

No opinions, no beliefs, just hard data, right?

01:18

What is also clear is that if the best diet does exist,

01:21

then we haven't yet found it

01:23

because the incidence of diet-related disease

01:26

has increased dramatically in the past several decades.

01:30

Now, you might think it's because people don't listen to what we tell them.

01:34

But in fact, that's not true,

01:36

people actually generally do follow dietary guidelines.

01:39

But according to the Center for Disease Control,

01:42

if you live in the United States,

01:44

there's over a 70 percent chance that you're either overweight, diabetic

01:49

or have non-alcoholic fatty-liver disease.

01:53

And there's overwhelming evidence that diet and lifestyle

01:56

are major drivers of these conditions.

02:01

So why is it that after so much research,

02:04

we still don't have an answer to the seemingly simple question

02:08

of what is the best diet for humans?

02:11

What I'd like to propose to you today is that the reason we don't have an answer

02:16

is because we've been asking the wrong question.

02:20

And it's the wrong question because it assumes

02:23

that the best diet depends only on the food

02:25

and not on the person eating it.

02:29

But what if differences in our genetics, lifestyle, our gut bacteria

02:34

cause us to respond differently to food?

02:37

What if these differences explain why some diets work for some people

02:42

but not for others?

02:44

What if our nutrition needs to be personally tailored to our unique make-up?

02:51

This is exactly the question we set out to ask in our own research,

02:55

which I did with my colleague Eran Elinav

02:57

and several graduate students from the Weizmann Institute of Science.

03:01

To take a scientific approach,

03:03

we first searched for a metric of healthy nutrition that we should study.

03:07

Most studies examine weight loss or risk of heart disease after some diet.

03:12

But the problem is that these are affected by many factors unrelated to diet,

03:17

they take many weeks to change,

03:19

and in the end, you get a single measure of success.

03:22

And if it didn't work, well then it's very hard to understand why.

03:27

And so instead, we searched for a metric

03:30

that would still be relevant for weight management

03:32

and diet-related disease,

03:34

but one that we could also easily and accurately measure across many people.

03:40

And this led us to focus on blood glucose levels,

03:44

and more precisely, changes in blood glucose levels after a meal.

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