hesexofthefrie
dswasalsoa
i
flue
ceI
samesexfrie
dshipsaperso
hada70i
creasedriskofbecomi
gobeseMe
hada44i
creasedriskofbecomi
gobeseafterweightgai
i
brotherI
sistersitwas67研究发现，朋友的性别也是一个影响。在同性友谊中，一个人变胖的风险增加了70。兄弟体重增加后，男性肥胖的风险增加了44。在姐妹中，这一比例为67。可推断出这项研究之所以涉及家庭成员和朋友，是因为研究人员可以比较结果。故选D项。
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