쉐도잉 연습: This Vitamin Prevents Age Spots (Most People Don't Get Enough) - 영상으로 영어 말하기 배우기

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Vitamin C is one of the simplest vitamins but also one of the most important ones for staying healthy and aging well.

Unlike most animals, humans can't make vitamin C ourselves.

We have to get it from food every day.

And this is important because vitamin C supports collagen synthesis, skin health, immunity, antioxidant defense and tissue repair.

So in this video, I'm going to break down what vitamin C actually does, how much you need and whether or not supplementing it is worth it.

Vitamin C is known as an antioxidant, but its primary role is probably collagen synthesis.

The story of vitamin C is tightly intertwined with scurvy, a disease that once devastated sailors on long sea trips.

For centuries, crews would develop bleeding gums, fragile skin, poor wound healing, and eventually death.

Today, we know that these symptoms are the result of the body's inability to produce collagen.

The sailors on the sea were deficient in vitamin C because they didn't have fresh food during their long voyages.

In 1747, Scottish naval surgeon James Lind conducted one of the first controlled clinical experiments.

He showed that citrus fruits that contained vitamin C could cure scurvy.

The sailors then started bringing more fermented vegetables like sauerkraut, which is very high in vitamin C.

The underlying mechanism was discovered much later.

Vitamin C is essential for collagen synthesis, and without it, you start to see your connective tissue break down, leading to the classical symptoms of scurvy, such as bleeding gums.

The pathway for vitamin C supporting collagen synthesis is this.

Procollagen gets formed when hydroxyl groups get added to proline and lysine, which is a process called hydroxylation.

This requires vitamin C.

This results in the assembly of procollagen with its triple helix structure.

Then, the secretion of procollagen outside the cells also requires vitamin C.

Without copper or vitamin C, collagen wouldn't have its most characteristic qualities that make it stronger than steel.

It's able to wound up together super tightly and is incredibly cross-linked.

The formation of collagen from procollagen requires vitamin C.

That's why vitamin C is often used in collagen supplements as well as in skin care products topically.

So does vitamin C supplementation support collagen synthesis in the joints and skin?

Well, yes it does.

A 2024 randomized controlled trial noted

that supplementing 80 mg of vitamin C with 5 g of hydrolyzed collagen for 16 weeks lowered wrinkle volume by 13.8%, wrinkle depth by by 16.9%,

skin roughness by 9.6%, and increased dermis density by 16.3% compared to placebo in healthy middle-aged women.

The addition of 30 mg of hyaluronic acid provided some small additional benefits.

Taking 48 mg of vitamin C before exercise to get over

15 g of gelatin enhanced collagen synthesis in the tendons that are being trained.

Both gelatin groups received vitamin C, and there is no group who didn't get vitamin C.

But vitamin C before exercise doesn't mitigate the collagen synthesis.

If anything, it would support it.

So vitamin C helps to support collagen synthesis, and it helps to maximize the benefits of collagen on skin and joints.

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Studies show that taking the sauna regularly is associated with 63% lower risk of sudden cardiac death, 63% reduced heart disease mortality, 46% lower risk of hypertension,

and 40% reduced all-cause mortality.

This is mediated by an increase in body temperature

and increased heart rate that mimic a cardiovascular workout while at the same time improving arterial stiffness, endothelial function, blood flow, immune system function,

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All right, back to the video.

What about vitamin C alone?

Is it going to help the skin or joints when you just take it alone?

People who consume more dietary vitamin C have a lower likelihood of wrinkled appearance and senile dryness.

However, that refers to dietary vitamin C and could be the result of people who consume more fruits and vegetables.

People who eat more vitamin C are just healthier.

But there are also some controlled studies looking at this.

A brand new study tested the effects of eating high vitamin C food like kiwifruit on skin vitamin C levels

and collagen synthesis.

Plasma and skin vitamin C also increased, showing that dietary vitamin C can reach skin tissue.

This was associated with improved skin function.

So eating more dietary vitamin C does help to supply more vitamin C to the skin.

Oral vitamin E

and C supplementation has been noted to increase the dose of

UVB radiation from the sun needed to cause redness of the skin.

As you can see from this graph, after three months, the minimal dose for UVB radiation to cause sunburns was significantly higher than before.

This suggests that the skin becomes more resilient against sun damage when it has enough vitamin E and vitamin C.

Topical vitamin C has also been seen to clinically improve photo-damaged skin and provide relief to deep furrows.

When it comes to topical vitamin C, then the evidence more suggests that it's useful for wrinkles and photoaging.

It can act locally in the skin and has clinical trials showing modest improvements.

When talking about oral vitamin C alone, then the data is much less convincing for wrinkles.

It supports normal collagen formation, especially if the intake is low, but there is not strong evidence that extra vitamin C by itself visibly reduces wrinkles in already sufficient people.

However, eating more dietary vitamin C appears to directly support skin collagen and function.

Regarding joint function, a 2021 meta-analysis of seven randomized controlled trials found

that vitamin C supplementation significantly reduced the risk of complex regional pain syndrome after orthopedic procedures,

but it didn't improve long-term functional outcomes or lower overall complications.

In patients who underwent joint replacement surgery, vitamin C can lower inflammatory markers and reduce the use of opioids, especially in the first 24 hours.

So overall, vitamin C supports collagen synthesis and protects the skin against photoaging.

Another important role for vitamin C is

that a vitamin C deficiency could contribute to the development of atherosclerosis and scarring of blood vessels.

Scurvy in arteries is essentially atherosclerosis or inadequate blood vessel healing and integrity.

In the mouth, scurvy causes bleeding gums, but a similar phenomenon of bleeding tissues and then the subsequent clotting may occur in the endothelium of the coronary arteries,

which leads to vascular dysfunction, thrombosis, and myocardial infarction.

Again, people who eat more vitamin C have lower rates of heart disease, probably because they eat more fruits and vegetables, and therefore they're healthier.

But it's partly also because vitamin C supports wound healing, and without vitamin C, you develop scurvy in the arteries, essentially.

And don't forget that vitamin C can act as an antioxidant, which lowers inflammation, which is another critical step in atherosclerosis.

A 2015 randomized controlled trial on obese individuals saw that 1,000 mg of vitamin C, 500 mg twice a day for 8 weeks,

lowered inflammation as measured by HSCRP by 48% and IL-6 by 36%.

Fasting glucose also dropped by 33%.

However, when it comes to overall heart disease risk reduction, then a 2017 Cochrane Review of clinical trials concluded that vitamin C supplementation doesn't reduce the risk.

However, a three-year randomized placebo-controlled trial in 520 men

and postmenopausal women found that a combination of 250 mg of slow-release vitamin C

and 91 milligrams of vitamin E given twice a day decreased the progression of carotid atherosclerosis in men.

So with all that being said, latent vitamin C deficiency can lead to poor wound healing in the gums and in the arteries.

So the most important thing is to prevent vitamin C deficiency.

But there's no evidence

that taking large amounts of vitamin C would help to reduce the risk of heart disease or something like that.

Lastly, I want to talk about a new finding regarding vitamin C's role in the broader context of aging.

Recently, scientists discovered that vitamin C was able to reverse biological age clocks in monkeys by inhibiting an enzyme called ACSL4.

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ACSL4 leads to cell senescence through what's called ferroaging, or iron accumulation.

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Excess iron levels are not only associated with a higher risk of heart disease and liver disease, but they're also implicated in the process of biological aging through what's known as lipofuscin.

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Lipofuscin is often called the age pigment.

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It's a yellow-brown waste material that gradually accumulates inside long-lived cells like neurons, heart muscle cells, and retinal cells.

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It looks like dark liver spots on the skin.

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Unlike many other forms of cellular damage, lipofuscant can't be eliminated that easily.

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As it accumulates over the course of decades, it begins to inhibit the normal cellular processing.

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Lipofuscant is made of oxidized proteins, damaged lipids, and iron.

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Iron acts as the catalyst that drives the process of lipofuscant accumulation, and vitamin C may help to interrupt this cycle in several ways,

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both as an antioxidant and by also supporting ferritin synthesis, which allows iron to be stored more safely and reducing the pool of free iron.

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So based on all of this, how much vitamin C should you get per day?

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The recommended daily allowance RDA for vitamin C is only 90 mg for males and 75 mg for females.

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That's not a lot, and you can easily cover that with a few pieces of vegetables or fruit.

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To prevent scurvy, only 1-2 mg is needed, but potentially as much as 7-10.

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Intakes of 200-400 mg milligrams a day of vitamin C from food

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or supplements largely saturates plasma and neutrophils in most healthy adults.

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The benefits above this level are largely limited to decreasing the severity and duration of common colds.

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You might see some additional benefits for antioxidant protection and blood sugar control at doses of 1000 milligrams a day.

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So taking over 200 to 400 milligrams of vitamin C can be an overkill, especially if you consume it in one meal or one supplement take.

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That's why for both supplementation and dietary intake, it's much better to spread out the vitamin C across the day to avoid this oversaturation.

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Vitamin C is a controversial supplement with many different opinions.

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Check out my video where I rank 100 supplements from worst to best based on clinical evidence.

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이 레슨의 어휘와 말하기 포인트

이 B2 수준 말하기 레슨은 영상 “This Vitamin Prevents Age Spots”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: vitamin, skin, collagen, synthesis, sauna. 이 영상에는 섀도잉할 문장 121개와 단어 1836개가 있습니다. 말하는 구간의 길이는 9:50입니다. 화자는 분당 약 187단어로 빠르게 말하므로 연음과 약하게 발음되는 소리가 많습니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 68%뿐이라 어휘가 어려운 편입니다.

이 영상의 핵심 어휘

영상에서 가장 어려운 단어 15개를 발음, 뜻과 함께 정리했습니다.

단어	발음	뜻
vitamin 명사	/ˈvɪt.ə.mɪn/	비타민
synthesis 명사	/ˈsɪnθəsɪs/	통합, 종합
sauna 명사	/ˈsɔː.nə/	사우나
antioxidant 명사	/ˌæntiˈɒksɪdənt/	항산화제
atherosclerosis 명사	/ˌæθɚoʊskləˈɹoʊsəs/	죽상동맥경화증
milligram 명사	/ˈmɪlɪɡɹæm/	밀리그램
artery 명사	/ˈɑɹ.təɹ.i/	동맥
bleed 동사	/ˈbliːd/	피를 흘리다
vegetable 명사	/ˈvɛd͡ʒ.tə.bəl/	채소, 야채
gum 명사	/ɡʌm/	잇몸
heal 동사	/ˈhiːl/	치료하다, 고치다
sailor 명사	/ˈseɪ.lɚ/	선원, 수병
blanket 명사	/ˈblæŋ.kɪt/	이불, 담요
dose 명사	/ˈdəʊ̯s/	복용량
accumulate 동사	/əˈkjuːmjʊˌleɪt/	모으다, 축적하다

영상에 나오는 구동사

단어	뜻
get over 동사	극복하다

이 영상의 문법

화자가 가장 많이 쓰는 문형을 영상 속 실제 표현과 함께 정리했습니다.

문형	영상 속 표현
수동태 be + 과거분사 — 누가 하는지보다 무슨 일이 일어나는지에 초점	is known · is tightly intertwined · was discovered
관계절 who / which + 절 — 사람이나 사물에 대한 추가 정보	sauerkraut, which is · lysine, which is · People who consume
현재완료 have/has + 과거분사 — 과거의 일이 지금도 관련이 있을 때	has been noted · has also been seen

주의할 발음

화자는 didn't, doesn't, can't 같은 축약형과 약화된 형태를 13번 사용합니다. 들리는 대로 짧게 발음하세요.

“th” 소리: synthesis /ˈsɪnθəsɪs/, atherosclerosis /ˌæθɚoʊskləˈɹoʊsəs/, pathway /ˈpæθˌweɪ/
“sh”와 “zh” 소리: deficiency /dɪˈfɪʃənsi/, accumulation /əˌkjuːm.jəˈleɪ.ʃən/, inflammation /ɪnfləˈmeɪ̯ʃən/, complication /ˌkɑm.pləˈkeɪ.ʃən/, deficient /dɪˈfɪʃənt/
긴 단어 — 강세 위치에 주의: antioxidant /ˌæntiˈɒksɪdənt/, atherosclerosis /ˌæθɚoʊskləˈɹoʊsəs/, deficiency /dɪˈfɪʃənsi/, accumulate /əˈkjuːmjʊˌleɪt/, accumulation /əˌkjuːm.jəˈleɪ.ʃən/

한국어 화자가 어려워하는 소리:

/f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: infrared /ˌɪnfɹəˈɹɛd/, deficiency /dɪˈfɪʃənsi/, inflammation /ɪnfləˈmeɪ̯ʃən/, deficient /dɪˈfɪʃənt/, ferment /fɚˈmɛnt/
/v/ — ㅂ(/b/)과 구별하기: vitamin /ˈvɪt.ə.mɪn/, vegetable /ˈvɛd͡ʒ.tə.bəl/, connective /kəˈnɛktɪv/, elevate /ˈɛləveɪt/, vascular /ˈvæskjələ/
/z/ — ㅈ이 아니라 성대를 울리는 /s/: plasma /ˈplæzmə/, maximize /ˈmæksəmaɪz/, glucose /ˈɡluː.kəʊz/, enzyme /ˈɛn.zaɪm/

이 영상으로 연습하는 방법

먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
0.75배속으로 한 문장씩 섀도잉을 시작하고, 익숙해지면 보통 속도로 돌아갑니다.
자신의 목소리를 녹음해 원본과 비교하고, vitamin, synthesis, sauna 같은 단어에 특히 주의합니다.

쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법

쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.

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쉐도잉 연습: This Vitamin Prevents Age Spots (Most People Don't Get Enough) - 영상으로 영어 말하기 배우기

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