I'm not able to lose weight as easily as I used to
I can't lose weight with my old methods=昔のやり方では痩せられない
lose weight=減量する
method=方式
I'm not able to lose weight as easily as I used to=昔のように体重を減らす事ができない
I'm not able to〜=〜ができない(可能でない)
これ、年々実感する辛い現実ですよね。わちゃー。
I just realized the way I have been doing it isn't going to help me lose any weight.
この場合、次のような言い方ができますよ。
ーI just realized the way I have been doing it isn't going to help me lose any weight.
「今までのやり方では体重が落ちないことに気がついた」
the way I have been doing it で「今までのやり方」
to lose weight で「体重が落ちる」
ご参考まで!