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多吃甜食有損記憶力
《神經內科》(Neurology)期刊上有一項德國研究顯示,人體保持適度低血糖對大腦記憶有益。如人體中血糖含量過高,將出現記憶問題。對甜食愛好者來說,這是個壞消息,食用過多甜食會使人健忘。英國《每日郵報》報導,在這項研究中,研究人員測試了141位平均年齡63歲的參與者的記憶能力和血糖水平,同時藉由腦部掃瞄來衡量他們海馬區的大小。 這些參與者都沒有糖尿病或前期糖尿病。那些超重、每天飲用超過三份半酒類、或有記憶和思考問題的志願者,在研究開始前就被排除在外。研究結果顯示,血糖含量較低的人較容易在記憶力測試中獲得高分。 研究人員讓這些參與者聽一個有15個單詞的列表,30分鐘後,有高血糖的人很難回憶起這些單詞。研究發現,被稱為糖化血紅蛋白(HbA1c)的長期血糖控制指標每上升7毫摩爾/摩爾(mmol/mol),就會導致參與者少記2個單詞。 柏林夏里特大學醫院(Charite University Hospital)的弗洛爾醫生說:「這些研究結果顯示,即使人們有正常範圍內的血糖含量,降低血糖含量仍是預防老年記憶問題和認知能力下降的有效策略。」 阿茨海默氏症協會(Alzheimer's Society)的研究公關經理沃爾頓(Clare Walton)說:「我們已經知道第2型糖尿病是發展阿茨海默氏症的一個危險因素,但這項最新研究顯示,高血糖也可能與沒有罹患糖尿病的人的記憶損失有關。」 沃爾頓還表示,控制血糖水平可能是改善人們記憶力的有效途徑,即使他們沒有糖尿病。但是,沒有糖尿病的人在考慮改變飲食或吃藥習慣前,需要更多研究來測試這一理論。在65歲的人群中,有三分之一會發展為痴呆,因此投資於這樣的研究是至關重要的。 上述研究成果發表在《神經內科》(Neurology)雜誌上。 |
How Sugar Spikes Hurt Your Memory
Your brain on high blood sugar Prevention News By Markham Heid Can't remember where you parked? Blame the sweet snack you had after lunch. Elevated blood sugar levels mess with your memory, finds a news study published in the journal Neurology. German researchers put 141 healthy adults through a series of memory and blood sugar tests. The study team also performed brain scans to measure each of the participants’ hippocampi, an area that plays a big role in memory. Here’s what they found: the higher a person’s blood sugar, the worse they performed on tasks measuring recall and learning ability. Higher levels of long-term blood glucose markers were also linked with a smaller hippocampus. Even people with normal blood sugar levels weren't in the clear, since memory suffered when short-term glucose markers spiked. “Elevated blood sugar levels damage small and large vessels in the brain, leading to decreased blood and nutrient flow to brain cells,” explains study co-author Agnes Flöell, MD, a neurologist at Berlin’s Charité Medical University. High blood sugar may also disturb signaling between and within the cells of your hippocampus, Dr. Flöell says. The most drastic memory issues are related to long-term markers of elevated blood sugar, her research shows. You don't have to give up sugar to keep your mind sharp. But there are steps you should take to protect your memory from high blood glucose. Dr. Flöell recommends eating a diet rich in fiber, protein, and whole grains to help your body move along and expel the sugary foods you eat. She says regular exercise also helps keep your blood sugar low because your body burns sugar for energy while you work out. For those 55 and older, Flöell advises asking your doctor to perform a test for fasting glucose and levels of the blood sugar marker HbA1c. Both of these can help your physician detect high blood sugar early so you can take steps to address the problem before it begins to impair your brain function, she says. |