案例：女，32岁。身高163cm，1个月前体重92kg，开始每天只吃两个苹果，现在体重降至86kg，主诉呼吸短促、无力、易感疲劳、腿痛。检验：甘油三酯2.1mmol/L，总胆固醇7.1mmol/L。该患者膳食脂肪供能的适宜比例为

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