เวลาท่องเที่ยวไทยเราก็จะเจอะเจอกับอากาศที่ร้อนมาก ซึ่งวิธีคลายร้อยที่ดีที่สุด และง่ายที่สุดก็คือ การดื่มน้ำเย็นๆ บางคนก็คงชอบดื่มชาขวดเป็นประจำ เพราะสดชื่นมาก เราก็เช่นกันคะ
 
ที่แรกเราคิดว่าชามีประโยชน์ เพราะถ้าหากใครซื้อตั๋วเครื่องบินไปญี่ปุ่น ก็จะเห็นคนญี่ปุ่นดื่มชากันตลอด แล้วหน้าก็เด็ง สวย ใสมาก แต่เพื่อนๆรู้ไหมคะ การดื่มชานั้นมีทั้งประโยชน์และโทษคะ จะเป็นอย่างไรมาดูกันเลยคะ
 
ชามีมากว่า 4,700 ปี สรรพคุณก็คือแก้กระหาย แก้ง่วง แถมยังช่วยต้านอนุมูลอิสระด้วยคะ ซึ่งอย่างที่บอกคะ ชามีทั้งประโยชน์และโทษ ซึ่งเราจะดื่มชาให้มีประโยชน์ ก็ต้องปฎิบัติตามต่อไปนี้คะ เรามีคำแนะนำ
 
ในตัวชาจะมีสารที่ประโยชน์ที่ชื่อ "คาเทคชินท์" แต่เมื่อมันถูกความร้อนก็จะละลายไปคะ ดังนั้นถ้าเพื่อนๆคนใดชอบดื่มชาร้อน แนะนำให้ชงเข้มๆ คะ
 
ชาเขียวหรือ สารสกัดจากใบชาสดทั้งหลาย ถ้าเป็นเครื่องดื่มแช่ย็น ความเย็นก็จะเป็นตัวช่วยรักษาคุณค่าของสารสำคัญในชาได้ แต่ถ้าถูกทำให้ร้อน ตัวชาที่มีประโยชน์ก็จะสลายไปด้วยเช่นกัน
 
ไม่ควรเติมนมในชา เพราะโปรตีนในนม จะไปจับสารสำคัญในชา และทำลายประสิทธิภาพของชา
 
ไม่ควรรับประทานชากับวิตามินเสริม หากเพื่อนๆต้องกิน ธาตุเหล็ก เกลือแร่ หรืออะไรพวกนี้ หลีกเลี่ยงการทานคู่กับชานะคะ เพราะสารที่สำคัญในชา จะไปตะกอนในธาตุเหล็ก หรือเกลือแร่ ทำให้ร่างกายไม่ดูดซึมคะ
 
ที่นี้เราก็มาดูโทษกันบางนะคะ คือในชาก็จะมีสารที่ชื่อ "แทนิม" ซึ่งเจ้าสารตัวนี้ก็จะไปตะกอนในโปรตีน และแร่ธาตุจากอาหารที่เราทาน ทำให้ร่างกายไม่สามารถดูดซึมสารอาหารที่สำคัญได้คะ เพราะเหตุนี้ เขาจึงไม่ให้เด็กดื่มชาไงคะ เพราะจะทำให้เด็กขาดสารอาหารคะ
 
ในชาจะมีสารที่คนไม่ค่อยได้พูดถึงอย่าง "ฟลูออไรด์" ซึ่งหากมีสะสมในร่างกานเรามากๆ ก็เสี่ยงต่อการเป็นโรค ไตวาย มะเร็งลำไส้ กระดูกพรุน โรคข้อ และโรคอื่นๆที่เกี่ยวกับกระดูก เพราะฉนั้นเพื่อนๆที่ดื่มชาบ่อยๆต้องระวังนะคะ
 
อีกสารหนึ่งที่อันตรายพอๆกันก็คือ "ออกซาเลท" ถ้าดื่มในปริมาณมากๆ หากสะสมก็จะทำให้ไตวายคะ
 
 
อย่างที่ทราบคะ ในใบชามีสารกาเฟ่อีนสูง ซึ่งจริงๆสูงกว่ากาแฟด้วยคะ แต่เพราะในชามีสาร แทนิน ที่ช่วยป้องกัน หรือลดปริมาณคาเฟ่อีนให้ซึมซัยเข้าร่างกายเราน้อยลง ทำให้ฤทธิ์กระตุ้นหัวใจ และสมองน้อยกว่ากาแฟคะ
 
เพื่อไม่ให้เป็นโทษต่อร่างกายเรามากเกินไป ก็ทานในปริมาณที่พอดีนะคะ ^^
 
 

edit @ 2 Sep 2011 16:13:23 by ChoCo

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