Sentence:  With meat , milk , butter and ice cream , the calorie-heavy U. S. diet is 40 % fat , and most of that <WSD>is</WSD> saturated fat - the insidious kind , says Dr. Keys , that increases blood cholesterol , damages arteries , and leads to coronary disease . 
Meaning of the word marked with <WSD> tags:  be identical to; be someone or something