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隔著玻璃曬太陽能補鈣?“0防腐劑”食物一定安全?真相是……

【連網】  

只吃水煮菜就能減肥?

隔著玻璃曬太陽能補鈣?

“0防腐劑”食物更安全?

一起了解真相↓↓

  01 隔著玻璃曬太陽也能補鈣?

  ?流言:不想出門時,坐在陽臺隔著玻璃曬太陽,也能“補鈣”。

  ?真相:隔著玻璃曬太陽很難補鈣。

  根據波長不同,太陽光中的紫外線可以分為UVA、UVB和UVC。能夠幫助合成維生素D的是UVB,UVA對維生素D的合成沒有幫助。

  普通玻璃如住宅窗戶、汽車玻璃,幾乎可以阻擋所有的UVB,僅允許UVA透過;特殊玻璃(如石英玻璃)可能允許UVB通過,但日常生活中極少使用這類材料。

  因此,隔著玻璃,太陽光中紫外線的透過率會大幅度降低,即使感到溫暖,皮膚也無法獲得足夠的UVB來合成維生素D,自然無法促進人體對鈣的吸收。

  

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