Waching daily Feb 4 2019

Hilary duff got a lot of back lash this year when she posted a video of herself enjoying

some sushi while pregnant.

But is it really bad to have sushi while pregnant?

Depending on who you ask, you need to either avoid it like the plague, or it's part of

a healthy pregnancy diet.

But why all the confusion and what are the real cold hard facts?

I'm doctor O., this is For Mothers, and in this video, I'll be going giving you

everything you need to know about eating sushi while pregnant.

We'll even cover mercury in fish towards the end of the video so make sure you stick

around.

If you enjoy the video, give it a like, subscribe, and turn on notifications to see more just

like it.

Let's get to it.

Let's start of by saying, sushi is awesome.

Although the fact that it's raw turns some people off, a lot of people really enjoy the

different varieties you can find all across the world.

Sushi as we know it today started in the rice fields of China hundreds of years ago, when

fish were fermented in rice and vinegar not because it made them taste better, but because

it made them last for a longer time, and the rice was usually thrown away afterwards.

Eventually, this new style preserving fish made its way down to Japan who decided, you

know what, I want to eat the rice too.

Since then it's evolved countless times and turned into the cultural phenomenon it

is today.

Now enough history.

When it comes to fish during pregnancy, let's get one thing out of the way.

Can a pregnant mother even eat cooked fish to begin with?

Yes, in fact, if you don't, you should consider adding some to your diet.

Fish provide a nice assortment of essential nutrients that your baby needs to develop.

Fish are high in vitamin D and protein, and most importantly omega 3 fatty acids, which

can be difficult to get in other foods.

Omega 3 is important for the development of the nerves, brain the eyes of a child, and

fish is the best source of it.

Now when it comes to sushi, although there are cooked options, the majority of the fish

used is in fact raw.

Raw foods in general are more likely to carry disease causing organisms than cooked food,

since the food isn't exposed to the intense heat that kills the majority of organisms.

Another factor that makes this more concerning is that during pregnancy, the system that

fights diseases in the body, called the immune system, is weakened in order to prevent it

from attacking your own baby.

This leaves you less protected against organisms that might've potentially found their way

into your food.

So what are the recommendations then?

Well, we have two completely conflicting views depending.

The U.S. Food and Drug Administration on one hand and the Centers for Disease Control recommend

completely cutting out sushi from your diet, due to the risk of infection, regardless of

how low that risk is.

That's because infections can cause severe abdominal pain, vomiting, and diarrhea, and

sometimes much worse than that.

On the other hand, the U.K. say there is no harm in having sushi while pregnant.

That's because modern food management techniques employed by producers, distributors, and the

restaurants serving the food have reduced the risk of infections to extremely low levels.

That's in addition to the fact that most establishments use farmed fish, which is usually

free of parasites to begin with and that they usually freeze the fish during the distribution

process, which kills most of the potential parasites that may have found their way into

the food.

In Japan, where eating sushi is a major part of life, most pregnant women continue to eat

sushi without any issue.

Basically, the U.S. guidelines on one hand say you should avoid all sushi altogether

because of the chance of severe infections, while the British say the risk is so low that

there's really no problem in eating sushi at all.

However, despite all the confusion, what both sides agree with is the final and crucial

part of this video - mercury.

Mercury is a liquid metal that when you're exposed to can cause problems in brain development,

especially in babies and children.

Mercury crosses the placenta, so if a mother is exposed to too much of it, it can effect

the baby's developing brain.

Effects can include reduced memory, attention, language skills, motor skills, and vision.

Mercury naturally forms from volcanos, forest fires, and from factories and often makes

its way into the water supply.

Because of that, most fish contain some amount of mercury.

When a larger fish eats a smaller fish, it absorbs its mercury, and for that reason,

smaller fish usually contain the least amount of mercury, while larger fish usually contain

the most.

So then you might be asking, well, why not just avoid all fish altogether?

Research shows that the children of parents that eat the most fish develop much faster

than children of parents that eat no fish at all, despite the tiny amounts of mercury

found in some fish.

So whether you choose to eat sushi or cooked fish, as long as they have low mercury levels,

it can actually really benefit your child.

So how do we make sure we get fish without getting too much mercury?

Well, it's really simple.

In the description below, I've left a link from the FDA about which fish are safe to

eat, and how often you can have them.

Oh and, one last thing.

Never under any circumstances have raw shellfish while pregnant.

Raw shellfish contain viruses and bacteria that can be absolutely harmful to your pregnancy

and both the British and United States guidelines say completely stay clear of the stuff.

As always it's important to note that everyone of you have your own unique health needs,

so make sure to talk to your own doctor before making any changes to your diet.

If you have a question I can answer in a future video, let me know in the comments below and

for more videos on motherhood, pregnancy, and baby care, make sure to like and subscribe,

and I'll see you next video!

For more infomation >> Is It Safe To Eat Sushi While Pregnant? | Sushi During Pregnancy - Duration: 5:26.

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Woman Claims Ex Who Promised Her A Car And A House Is ' A Total Fraud' - Duration: 3:53.

For more infomation >> Woman Claims Ex Who Promised Her A Car And A House Is ' A Total Fraud' - Duration: 3:53.

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What is Relative Velocity | Physics in Motion - Duration: 6:13.

♪♪

How fast is something really moving?

Standing here, I can guess that the boat behind me

is moving 5 meters per second to the left.

But if I'm on the boat, the boat is stationary

and it's the shore that's moving

at 5 meters per second to the right.

In this segment,

we're going to learn about relative velocity,

which will help us understand this phenomenon

a little bit better.

So far, when we've talked about motion,

our frame of reference has remained static.

Frame of Reference is the view

of the person or object observing the motion.

For example, from my frame of reference on the shore,

the boat is moving,

but from my frame of reference on the boat

the boat is stationary

and the shore appears to be moving.

And this applies to everything.

From our frames of reference on Earth,

the Earth is still,

but from someone observing from another planet,

the Earth is speeding through space.

According to the laws of physics

there's no way to distinguish between

an object at rest and an object moving

at a constant velocity.

This means that there is no one answer to the question

"How fast is something moving?"

It's all relative.

Most of the time we assume a stationary frame of reference

relative to the Earth,

but other times we can have

a moving frame of reference, like this boat.

Let's say this boat is moving at 5 meters per second

parallel to the shoreline in the positive direction

and that I begin walking at 1 meter per second

in the same direction the boat is traveling in.

From someone standing still on the pier,

how fast do you think they see me moving

from their frame of reference?

To answer this question, let's solve it

by using a diagram or mathematically.

Our frame of reference is someone looking at the boat

from the pier.

The boat's velocity vector shows that it is moving

at 5 meters per second in the positive direction.

I'm on the boat moving in the same direction

at 1 meter per second.

We can see my velocity vector as well.

To calculate my velocity relative to

someone standing on the pier

all we have to do is add my velocity vector

to the boat's velocity vector.

Add 5 plus 1 and my velocity relative to the pier

is 6 meters per second in the positive direction.

Now, let's solve the problem mathematically.

The velocity of the boat relative to the pier,

V sub boat to pier,

and my velocity relative to the boat,

V sub Adrian to boat,

can be added together

because they are in the same plane.

Their sum is the resultant velocity,

my velocity relative to the pier.

Five meters per second in the positive direction

plus 1 meter per second in the positive direction

add up to 6 meters per second in the positive direction,

which is the same answer we got

using the graphical method.

Now, what if I was to walk in the opposite direction

on the boat?

The boat is still moving at 5 meters per second

in the positive direction,

but this time I am moving in 1 meter per second

in the negative direction,

or negative 1 meter per second.

What will my velocity be relative to the pier this time?

We'll still add V sub boat to pier

and V sub Adrian to boat

and this time V sub boat to pier is still

5 meters per second,

but V sub Adrian to boat is negative 1 meter per second.

So the resultant velocity will be 4 meters per second,

still in the positive direction.

That was a relative velocity problem

in which all movement was in one dimension.

Let's work through a problem in which the movement

is in two dimensions.

This boat is traveling east

going 5 meters per second.

Let's say I walk going north across the deck of the boat

at 2 meters per second this time.

What's my velocity relative to the boat?

Let's draw it out.

It's simpler than you think.

From the perspective of anything on the boat

the boat is always still

and it's everything else that's moving.

To know my velocity relative to the boat

the velocity of the boat doesn't matter.

So, from the frame of reference of the boat,

my relative velocity is just 2 meters per second going north.

When I moved across the deck

what was my velocity relative to the pier?

Let's draw it out.

The boat's velocity vector is going

5 meters per second east.

My velocity vector is going 2 meters per second north.

We'll pick north and east as our positive directions.

From here on I just need to know the resultant

of these two vectors.

To do that I need to add them together,

taking into account

that they are pointing in different directions.

So I'll use the tip-to-tail method

to put them together

and use the Pythagorean Theorem to calculate the resultant.

We can make the boat's velocity relative to the pier, A,

my velocity relative to the boat, B,

and the resultant velocity relative to the pier, C.

The Pythagorean Theorem says that

the square of the two sides of our right triangle

made by the vectors added together,

A squared plus B squared

equals the square of the hypotenuse,

or the square of the resultant vector, C squared.

5 squared plus 2 squared is equal to C squared.

5 squared is 25 and 2 squared is 4.

25 plus 4 is 29.

And if we take the square root on both sides

we find out that C

is equal to 5.39 meters per second

going northeast.

So from the frame of reference of the pier,

when I moved across the deck of an already moving boat

I traveled 5.39 meters per second going northeast

relative to the pier.

An important point to remember is that

all motion is relative.

When something's moving,

there isn't one correct answer as to how fast it's going

or even if it's moving at all.

It all depends on the frame of reference of the observer

and that's why relative velocity is so important.

That's it for this segment of "Physics In Motion."

We'll see you next time.

(announcer) For more practice problems, lab activities,

and note taking guides

check out the "Physics In Motion" toolkit.