During prolonged fasting, in what sequence are the following organic compounds used up by the body ?
(a) First carbohydrates, next proteins and lastly lipids
(b) First proteins, next lipids and lastly carbohydrates
(c) First carbohydrates, next fats and lastly proteins
(d) First fats, next carbohydrates and lastly proteins
(c) During prolonged fasting, first of all carbohydrates are utilised which include glycogen stored inliver. This is followed by the breakdown of adipose tissue, thus providing lipids and lastly the body utilises proteins.