Why use PROC IMPORT to read a text file?
Just write the data step yourself. You will have much more control (and in this case less code).
%let myData=/home/u59821735/My Files/MyData;
data body_fat ;
infile "&myData/BodyFat.txt" dsd dlm=' ' firstobs=2 truncover;
input row brozek age weight height neck chest adbom;
run;
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