본문/내용
4. 무기질
뇌에 여기저기 분포하고 있는 zinc 와 iron이 부족할 경우 뇌의 발달에 미치는 영향에 대한 연구도 많이 이루어졌다. Zinc는 주로 해마에 주요하게 저장되어 있다가 빠른 turn over를 겪으면서 GABA 와 glutamate의 분비를 조절한다(Pfeiffer 등, 1982,; Chang 등, 1995). 이런 과정을 통해 zinc는 정상적인 뇌신경계의 형태를 만드는데 중요한 역할을 하고 있다(Dreosti, 1993). 원숭이와 쥐실험을 통해 태아기와 영아기때 zinc가 결핍될 경우, 학습능력이 저하되고 활동성이 감소되며 인지과제 수행이 저하된다고 보고한 바 있다(Golub, 1995). Halas 등(1979)도 태어난 직후 zinc의 결핍을 경험했던 성인쥐에서 장기 기억력이 저하되어있음을 보고하였다. Iron 또한 중추신경계의 기능에 필수적인 물질로서 이것이 결핍될 경우 dopamine의 D2 receptor의 농도에 변화가 생겨 집중력이 저하된다는 연구결과도 있다(Beard, 1995). Weinberg 등(1980)은 iron이 결핍된 쥐에서 강한 자극에 대한 반응이 느리고 활동성 및 각성이 저하되어 있음을 발견하고 초기 발달에서 iron 결핍이 초래하는 여러 인지적, 행동적 영향력을 강조하였다.
5. 기타
마지막으로 인간이 섭취함으로써만 공급되는 vitamin의 결핍이 뇌 발달에 어떤 영향을 초래하는 지에 대해서 언급하지 않을 수 없다. β-carotene과 vitamin C, E 은 신경전달물질에 간접적으로 영향을 미치는 대표적인 영양소라고 한다. Vitamin이 직접적으로 뇌 발달에 미치는 영향에 대해선 아직까지 밝혀진 바 없으나 간접적으로 중요한 신경전달물질 중의 하나인 acetyl…
마지막으로 인간이 섭취함으로써만 공급되는 vitamin의 결핍이 뇌 발달에 어떤 영향을 초래하는 지에 대해서 언급하지 않을 수 없…
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