وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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وتدعى أيضاً الشحميات وهي من المركبات العضوية غير القابلة للذوبان في الماء، وتعد أحد المكونات الرئيسية الموجودة في جسم الإنسان بالإضافة للبروتينات والسكريات، وتشمل كل من الدهون والشموع والزيوت وبعض الهرمونات ومكونات معينة من الأغشية وتعمل كجزيئات لتخزين الطاقة والإشارات الكيميائية.
على الرغم من أن المواد الدهنية معروفة من العصور ما قبل التاريخ، إلا أن الكيميائي الفرنسي ميشيل أوجين شيفرويل قام في عام 1823، بنشر بحثه عن الدهون الحيوانية، حيث كشف فيه عن طبيعة تفاعل التصبن وأظهر أن الدهون والزيوت عبارة عن إسترات للأحماض الدهنية والغليسيرول.
تقسم أنواع المواد الدهنية المختلفة إلى ما يلي:
تعمل المواد الدهنية داخل الجسم كاحتياطي للطاقة، وتنظيم الهرمونات، ونقل النبضات العصبية، وحماية الأعضاء الحيوية، ونقل العناصر الغذائية التي تذوب في الدهون.
وفي الطعام تعمل كمصدر للطاقة بمحتواها العالي من السعرات الحرارية، وتضيف ملمساً وطعماً مميزاً، وتساهم في الشعور بالشبع.
يمكن أن تؤدي الكميات الزائدة من المواد الدهنية في الدم إلى حدوث ترسبات دهنية في جدران الشرايين، ما يزيد من خطر الإصابة بأمراض القلب.
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