It is difficult for children to change their eating habit later in life. ，parents should encourage healthy eating from an early age.
A. Otherwise
B. Therefore
C. Besides
D. However
网友回答
A. Otherwise
(答案→)B. Therefore
C. Besides
D. However
解析：A.否则 .B.因此C.除此之外 D.然而。句意：对于孩子们来说，在日后来改变他们的饮食习惯是很难的。因此，父母亲应该在他们年纪还小的时候就鼓励他们有一个健康的饮食习惯。故可知选B。