原文

Be healthier and happier by spending time in the sun

In the dead of winter,we don't typically think about spending time outside,but according to many medical experts,we should.

The sun is our greatest source of a vitamin that is essential for good health - vitamin D.

This important nutrient strengthens bones and teeth and is linked to the prevention of heart disease,cancer and many life-threatening diseases. In contrast, a vitamin D deficiency can lead to weak bones and teeth as well as other health problems.

How do we get it?

The recommended daily requirement is 400-600 IU. In summer,people with dark brown eyes and darker skin convert sunlight from just 15 minutes outside without sunscreen into adequate of vitamin D.

Even during winter,just a 10-minute walk midday can keep the body's vitamin D at healthy levels. During brief walks,we receive the greatest benefits when we wear no sunsreen and expose as much skin to the sun as possible.

The vitamin can also be obtained from foods such as salmon,shrimp,tofu and eggs.

Vitamin D supplements are another option,but consult a doctor first. One thing is for sure,you need to get plenty of vitamin D this winter.

词汇

dead of winter 隆冬之时

Farmers have nothing to do in the dead of winter because noting can grow in this season.

dead of night

The thief sneaked into the house in the dead of night.

deficiency 不足 缺乏

The elderly patient has a long-term calcium deficiency.

Pregnant women tend to suffer from iron deficiency.

A deficiency in the number of teachers in remote areas has been an unsolvable problem.

convert

What's the formula to convert celsius into Fahrenheit?

Christy recently became a convert to no carb diet.

salmon 鲑鱼

The black bear is waiting bu the creek to fish for salmon.

Tracy oerdered smoked salmon as an appetizer.

句型

assum/presuume :  assume没有依据胡乱猜测; pressume有一点依据的猜测

the wonder+n  神奇的

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