透明なジュースが日本で流行っている理由の一つは、ジュースを飲んでいるという罪悪感を感じないからです は、
One of the reasons for a transparent soft drink to be popular in Japan is that we don't feel guilty so much about drinking it.
と言えますか？
One of the main reasons why ... has become so popular
The biggest reason why people are so in love with
ーOne of the main reasons why transparent juice has become so popular in Japan is because people don't feel so guilty about drinking juice like that.
「日本で透明なジュースが人気な主な理由は、透明なジュースを飲んでいてもあまり罪悪感を感じないからです。」
One of the main reasons why ... has become so popular で「…がとても人気な主な理由は」
feel guilty で「罪悪感を感じる」
ーI think the biggest reason why Japanese people are so in love with clear juice is because it doesn't feel like you're drinking juice at all.
「日本人が透明なジュースを大好きな一番の理由は、（透明だと）ジュースを飲んでいる気がしないからだと思います。」
The biggest reason why people are so in love with ...で「人々が…を大好きな一番の理由は」
it doesn't feel like ... で「…の気がしない」
ご参考まで！
カナダ 
