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咖啡對人體的效用
飲用咖啡可以降低得患「阿茨海默氏病」和「老年癡呆症」的機率。咖啡還可降低得帕金森綜合症的機率。咖啡可以提高短期的記憶能力和IQ。咖啡還可降低得糖尿病的機率。咖啡可以降低得肝硬化以及心臟疾病的機率。咖啡中的鞣酸可降低食物引發齲齒的能力。 酒精或煙草可以令人感到陶醉感與刺激,同樣地咖啡因也可以令人感到興奮。由於咖啡因有刺激中樞神經或筋肉的作用,可使筋肉疲勞恢復,工作效率提升,具有清醒的效果能使頭腦反應活潑靈敏。還有由於刺激交感神經,可以抑住副交感神經的興奮而引起的氣喘。 咖啡也有幫助消化的效果,特別是食用過肉類時、胃液分泌多,促進消化,防止胃下垂。由於咖啡因可以分解脂肪,吃完熱能高的食物後,西方人必定希望都喝杯咖啡。 骨質疏鬆並非婦女專有的病,但卻大部份發生於婦女身上。造成骨質疏鬆的因素包括鈣和蛋白質的攝取,抽煙,運動習慣,年齡和體重。為要確實洞察咖啡因的攝取和骨質疏鬆的關係,研究者必須小心的掌握每一個多變的因素。 1994年一篇Barrett Connor的研究發現,咖啡因的攝取會影響骨質密度的降低這僅發生在那些在其成人時期每天局限於一杯牛奶的婦女身上。根據這個研究,也依常理來判斷,咖啡僅會間接造成鈣平衡的不足,譬如有些婦女以它來代替含鈣豐富的飲料。 1995年Barger-Lux和Heaney 由190位婦女得到的分析數據所下的結論是: "一杯牛奶所提供的鈣質足以抵消八杯含咖啡因所帶來的負面效果…," 這強調了一個事實,咖啡因並非造成骨質疏鬆的高危險因素,鈣質的攝取不足才是主要的原因,也使得那些次要因素,如咖啡因,發生了效應。 1981年哈佛大學一篇報告指出,大量飲用咖啡會導致胰臟癌。可是,之後至少有七項重要的研究都未能證實這一點,因此研究人員撤銷了這個結論。另外有好幾項研究,也都未能證明喝咖啡與乳癌有關係。波士頓大學的研究結果顯示,大量喝咖啡似乎能降低腸癌或直腸癌的風險,每天至少喝5杯咖啡的人患結腸癌的機率,較不喝咖啡的人低40%。 (From New York Times, September 13, 1995) 咖啡中有消除蒜味效果,又含有琺瑯類,所以在品嚐蒜味料理後,咖啡是不可或缺的飲料。 1980年代一項研究的結果指出,長時間每天喝咖啡5杯或以上的男人,可能容易患心髒病。但最近的研究發現,女性每天喝咖啡5杯以下,患心髒病的危險不會提高;每天喝6杯以上的婦女,心髒病突發的風險似乎也沒有增大。 另外咖啡也有脫臭效果。使用研磨式咖啡沖泡過的殘渣放於容器中使乾燥,放入冰箱裡,或鞋箱中可以當作脫臭劑。撒在煙灰缸也可消除煙草味。 而咖啡也可使用於隱藏味道。例如速溶咖啡用開水溶化,使其味道沾於肉上更可成為香甜可口的肉料理。 香噴噴的咖啡,是提神醒腦的飲品,而最新研究還發現,每天喝幾杯咖啡可預防膽結石。 美國醫學協會期刊報導,美國哈佛大學研究人員發現,每天喝兩到三杯咖啡的男性,得到膽結石的機率比不喝咖啡的人低了40%,而每天喝咖啡達四杯以上的話,得膽結石的機率更降為45%。不過,無咖啡因的咖啡可就沒有這種效果了,只有含咖啡因的咖啡,才能刺激膽囊收縮,並減少膽汁內容易形成膽結石的膽固醇。至於咖啡作用的原因,目前還不清楚,而同樣含有咖啡因的茶、可樂等其它飲料,由於咖啡因含量低於咖啡,因此無法達到同樣效果。 領導研究的哈佛大學公衛學院萊茲曼博士表示:『我不會真的建議大家喝咖啡來預防膽結石,但繼續喝也無妨,因為咖啡並不會導致什麼重大疾病。他表示這個研究發現應該也對女性有效。膽結石主要由膽固醇形成,缺乏運動、油膩的飲食或體重過重是主要病因。 咖啡之中含有許多咖啡因會不會影響健康呢?或許有些人會如此顧慮。然而咖啡二至三杯的量,是沒有問題的,反而適度的暢飲咖啡對身體具有療效。正確地了解咖啡,讓大夥都能快樂地暢飲且享受一下咖啡時間! |
Daily Consumption of Coffee May Reduce Diabetes Risk
January 6, 2013 @ Glenn Seymour If you drink three to four cups of coffee per day, you may be at a reduced risk of developing type II diabetes, according to a new study published by the Institute for Scientific Information on Coffee (ISIC), a not-for-profit organization devoted to the study and disclosure of science related to coffee and health. Compared to drinking one or no cups of coffee per day, moderate consumption of coffee, was associated with a 25 percent decreased risk of developing diabetes. One study tested glucose and insulin after an oral glucose tolerance test with 12 grams of decaffeinated coffee, 1 gram of chlorogenic acid, 500 milligrams of trigonelline, or a placebo. The study pointed out that chlorogenic acid and trigonelline reduced early glucose and insulin responses and contributed to the beneficial effect of coffee. The report also shows that the link between coffee consumption and a reduced risk of diabetes could be seen as counter intuitive, as drinking coffee is often linked to unhealthier habits like smoking and low levels of physical activity. Past studies have shown that moderate coffee consumption is not associated with an increased risk of hypertension, stroke or coronary heart disease. Meanwhile, research on patients with CVD has shown that moderate coffee consumption is inversely related with risk of heart failure, with a J- shape relationship. The reason about why coffee may reduce diabetes risk can be summed up in a few theories. ● the “Energy Expenditure Hypothesis,” in which the caffeine stimulates metabolism, increasing energy expenditure. ● the “Carbohydrate Metabolic Hypothesis,” which says coffee components play a key role by influencing the glucose balance in the body. It's a reason for coffee lovers to rejoice but it doesn't mean sugary lattes with whipped cream and syrup are healthy. Drinking coffee alone isn't a substitute to exercise, a balanced diet, and a healthy lifestyle to ward off chronic diseases such as diabetes. One out of every three people with diabetes is unaware they have this chronic condition. Some of the risk factors for diabetes include inactivity, metabolic syndrome, being older than 45, high cholesterol, blood pressure, or triglycerides, genetics, obesity, and more. Diabetes prevention starts with you. If you have type 2 diabetes, healthy diet, certain lifestyle changes, and our Diabetes Guide can help you manage your condition. |